A bored pile construction device for a basement structure
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CSCEC INT CONSTR
- Filing Date
- 2025-07-21
- Publication Date
- 2026-06-19
AI Technical Summary
In the renovation of old structures or the redevelopment of unfinished buildings, when it is necessary to build new cast-in-place piles below the basement, existing technologies are difficult to effectively avoid water inrush accidents at the borehole opening, which can lead to basement flooding. Furthermore, there are problems with solutions that are ineffective in dewatering or have long construction periods and high costs.
A pile casing is installed on the basement floor slab, with its height higher than the high-pressure water stratum. The water-soil mixture is managed through the grout drain pipe and valve system inside the pile casing to avoid the risk of sudden water inrush, and the mixture is discharged after the initial setting of the cast-in-place pile.
Without taking rainwater management measures, basement flooding can be effectively avoided, construction processes can be simplified, and costs and environmental impact can be reduced.
Smart Images
Figure CN224378856U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of building construction technology, and specifically refers to a grouting pile construction device for existing basement structures. Background Technology
[0002] Generally, the construction working face of newly built cast-in-place piles is on the ground surface. When there is a confined aquifer with a high water head below the site, since the water head elevation is often below the ground surface, there is no risk of water inrush at the borehole opening (high-pressure water gushing out from the borehole opening) when the pile hole passes through the high-confined aquifer.
[0003] In scenarios such as the renovation of old structures or the redevelopment of unfinished buildings, adjustments to the foundation plan are necessary. When constructing new cast-in-place piles below the existing basement, the high-pressure water level of the site may be located within the basement area. During pile drilling, a sudden water inrush at the borehole opening is highly likely, causing the basement to flood due to pressure differences. Common solutions include: first, dewatering, but this is less effective and causes significant environmental disturbance in sensitive environments or where the aquifer is deep and difficult to completely seal; second, backfilling (or flooding) the basement at ground level, but this method is time-consuming, costly, and polluting. Summary of the Invention
[0004] The purpose of this utility model is to overcome the defects of the prior art and provide a construction device for cast-in-place piles in existing basement structures. When there is a confined aquifer with a high water head below the ground and it is necessary to build new bored cast-in-place piles below the basement floor slab (or raft slab), without taking dewatering measures, a pile sleeve is installed on the basement floor slab, so that the height of the pile sleeve is higher than the height of the high confined aquifer, thereby avoiding the risk of sudden water inrush and causing the basement to be flooded.
[0005] The technical solution to achieve the above objectives is a cast-in-place pile construction device for existing basement structures, which is installed on the basement floor slab. The construction device includes:
[0006] A pile sleeve is fixedly installed on the top of the base plate, and a drilling space for drilling is formed inside the pile sleeve, which extends along the length of the pile sleeve.
[0007] A grout discharge pipe is installed on the side of the pile casing, the grout discharge pipe is connected to the drilling space, and a grout discharge port is provided on the side of the grout discharge pipe away from the pile casing; and
[0008] The valve is installed inside the slurry discharge pipe.
[0009] Furthermore, the pile casing is composed of several casing units spliced together, and two adjacent casing units are fixedly connected by clamps. The grout discharge pipe is provided on the bottom casing unit.
[0010] Furthermore, a flange is provided at the end of the pile sleeve, and a plurality of bolt holes are formed on the flange. The basement floor slab has threaded holes corresponding to the bolt holes. The bolt holes and the threaded holes are aligned, and the bolts are threaded into the bolt holes and the threaded holes to fix the basement floor slab and the pile sleeve together.
[0011] Furthermore, the inner diameter of the pile sleeve is larger than the outer diameter of the cast-in-place pile to be grouted.
[0012] Furthermore, a water-stop gasket is provided between the pile sleeve and the basement floor slab.
[0013] Furthermore, the length of the pile casing is determined based on the groundwater level and the construction clearance height.
[0014] Compared with the prior art, this utility model has the following advantages:
[0015] When there is a confined aquifer with a high water head below the ground, and it is necessary to construct bored piles below the basement floor slab (or raft slab), in the absence of dewatering measures, the risk of water inrush and basement flooding can be avoided by installing pile sleeves on the basement floor slab, so that the height of the pile sleeves is higher than the height of the confined aquifer. Attached Figure Description
[0016] Figure 1 This is an overall structural diagram of a cast-in-place pile construction device for an existing basement structure.
[0017] Figure 2 This is a diagram illustrating the connection between the pile sleeve and the basement floor slab of a cast-in-place pile construction device for an existing basement structure.
[0018] Figure 3 This is a rendering of another embodiment of a cast-in-place pile construction device for an existing basement structure.
[0019] Legend: 1. Pile driving equipment; 2. Basement; 3. Pile sleeve; 4. Water-stop gasket; 5. Flange; 6. Grout drain pipe. Detailed Implementation
[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.
[0021] See Figure 1A construction device for cast-in-place piles in an existing basement structure is used for construction on the basement slab. The construction device includes: a pile sleeve 3 fixedly installed on the top of the basement slab, the pile sleeve 3 having a drilling space for drilling rods, the drilling space extending along the length of the pile sleeve 3; a grout discharge pipe 6 disposed on the side of the pile sleeve 3, the grout discharge pipe 6 connecting to the drilling space, the grout discharge pipe 6 having a grout discharge port on the side away from the pile sleeve 3; and a valve disposed in the grout discharge pipe 6.
[0022] In this invention, a preferred embodiment is as follows: When there is a confined aquifer with a high water head below the construction site, and the height of the confined aquifer is higher than the height of the basement 2, the pile sleeve can be fixed on the floor slab of the basement 2. The height of the pile sleeve should be higher than the height of the confined aquifer. In this embodiment, the pile sleeve extends above the ground surface. The valve located in the grout drain pipe 6 is closed. A pile-forming device 1 is set on the ground surface. Through the pile-forming device, the drill rod is lowered into the pile sleeve 3 and abuts against the ground. The foundation slab of basement 2 is constructed by driving pile holes into the soil layer at the bottom of basement 2 using pile driving equipment 1. During construction, the confined water layer will squeeze the water-soil mixture into the pile sleeve 3. However, since the height of the pile sleeve 3 is higher than the height of the confined water layer, the squeezed water-soil mixture will not flow out of the pile sleeve 3. Then, cast-in-place piles are poured into the driven pile holes. After the cast-in-place piles have initially set, the valve is opened to discharge the water-soil mixture in the pile sleeve 3. Then, basement 2 is cleaned and the pile sleeve 3 is removed.
[0023] Furthermore, the pile sleeve 3 is composed of several sleeve units spliced together, with adjacent sleeve units fixedly connected by clamps. The grout discharge pipe 6 is installed on the bottommost sleeve unit. Preferably, the pile sleeve 3 structure is composed of several sleeve units, allowing the height of the pile sleeve 3 to be adjusted according to the on-site construction conditions. Furthermore, the sleeve units can also be fixedly connected by bolts, with connecting plates installed at the ends of the sleeve units. Two sleeve units are fixedly connected by threaded bolts between the two connecting plates.
[0024] Furthermore, a flange 5 is provided at the end of the pile sleeve 3, and a plurality of bolt holes are formed on the flange 5. A threaded hole is formed on the basement 2 floor corresponding to the bolt holes. The bolt holes and the threaded hole are aligned, and bolts are threaded into the bolt holes and the threaded hole to fix the basement 2 floor and the pile sleeve 3. By fixing the pile sleeve 3 with bolts, the pile sleeve 3 is firmly fixed to the basement 2 floor. Preferably, during installation, the end of the pile sleeve 3 is ground smooth, or polished with resin, to reduce the unevenness of the pile sleeve 3 surface and prevent water-soil mixture from overflowing from the gap between the pile sleeve 3 and the basement 2 floor.
[0025] Furthermore, the inner diameter of the pile sleeve 3 is larger than the outer diameter of the cast-in-place pile to be grouted.
[0026] Furthermore, a water-stopping gasket 4 is provided between the pile sleeve 3 and the bottom slab of the basement 2.
[0027] Furthermore, the length of the pile sleeve 3 is determined based on the height of the groundwater level and the height of the construction clearance.
[0028] In another embodiment of this utility model, for two-story or multi-story basements, the water level of the confined water in the site is relatively low (as shown in the attached figure). Figure 3 When (as shown), a sealing steel sleeve device is used in the basement area of this floor (and below): holes are pre-drilled and bolts are pre-embedded at the corresponding pile hole positions inside the basement; and a steel sleeve is installed, with its two ends respectively bolted to the bottom plate and the ceiling surface (structural plate) of this floor; the end interface is sealed by an annular water-stop ring; after sealing, conventional drilling can be carried out on the upper part of the structural plate, and low headroom drilling equipment can be used for construction inside the basement.
[0029] The following describes the usage process of a cast-in-place pile construction device for existing basement structures according to this utility model.
[0030] When there is a confined aquifer with a high water head below the construction site, and the height of the confined aquifer is higher than the height of the basement 2, the pile sleeve can be fixed on the bottom slab of the basement 2. The height of the pile sleeve should be higher than the height of the confined aquifer. In this embodiment, the pile sleeve extends above the ground surface. The valve located in the grouting pipe 6 is closed, and a pile-forming device 1 is set on the ground surface. Through the pile-forming device, the drill rod is lowered into the pile sleeve 3 and abutted against the bottom slab of the basement 2. The pile-forming device 1 is used to drill pile holes into the bottom slab of the basement 2 and the soil layer at the bottom of the basement 2. During construction, the confined aquifer will squeeze the water-soil mixture into the pile sleeve 3. However, since the height of the pile sleeve 3 is higher than the height of the confined aquifer, the squeezed water-soil mixture will not flow out of the pile sleeve 3. Then, the cast-in-place pile is poured into the drilled pile hole. After the cast-in-place pile has initially set, the valve is opened to drain the water-soil mixture in the pile sleeve 3. Then, the basement 2 is cleaned and the pile sleeve 3 is removed.
[0031] The present invention has been described in detail above with reference to the accompanying drawings and embodiments. Those skilled in the art can make various modifications to the present invention based on the above description. Therefore, certain details in the embodiments should not be construed as limiting the present invention, and the scope of protection of the present invention shall be defined by the appended claims.
Claims
1. A construction device for cast-in-place piles in existing basement structures, constructed on the basement floor slab, characterized in that, The construction device includes: A pile sleeve is fixedly installed on the top of the base plate, and a drilling space for drilling is formed inside the pile sleeve, which extends along the length of the pile sleeve. A grout discharge pipe is installed on the side of the pile casing, the grout discharge pipe is connected to the drilling space, and a grout discharge port is provided on the side of the grout discharge pipe away from the pile casing; and The valve is installed inside the slurry discharge pipe.
2. The cast-in-place pile construction device for existing basement structures according to claim 1, characterized in that: The pile casing is composed of several casing units spliced together. Adjacent casing units are fixedly connected by clamps, and the grout discharge pipe is provided on the bottom casing unit.
3. The cast-in-place pile construction device for existing basement structures according to claim 1, characterized in that: The end of the pile sleeve is provided with a flange, and a plurality of bolt holes are formed on the flange. The basement floor slab is provided with threaded holes corresponding to the bolt holes. The bolt holes and the threaded holes are aligned, and the bolts are threaded into the bolt holes and the threaded holes to fix the basement floor slab and the pile sleeve.
4. The cast-in-place pile construction device for existing basement structures according to claim 1, characterized in that: The inner diameter of the pile casing is larger than the outer diameter of the cast-in-place pile to be grouted.
5. The cast-in-place pile construction device for existing basement structures according to claim 1, characterized in that: A water-stop gasket is installed between the pile sleeve and the basement floor slab.
6. The cast-in-place pile construction device for existing basement structures according to claim 1, characterized in that: The length of the pile casing is determined based on the groundwater level and the construction clearance.