Active hole wall supporting device for SDDC pile construction

Abstract

The invention relates to the technical field of hole wall supporting devices, in particular to an active hole wall supporting device for SDDC pile construction, which comprises a plastic pile casing, at least one caulking groove is arranged on the side close to the hole wall, and a grouting cavity is arranged in the body of the plastic pile casing; a side through hole is formed between the grouting cavity and the caulking groove in a communicating mode. The positioning supporting part comprises a deformation thin plate which is arranged in the embedding groove and located on the outer side of the side through hole, and a plurality of anchor rods are arranged on the side, close to the hole wall, of the deformation thin plate; the device can replace a steel casing with the plastic casing, does not need a recycling process, simplifies the construction cost, and is beneficial to improving the construction efficiency; the plastic pile casing can pour permeation slurry into soil around the hole wall to form a solidified filling structure, lateral constraint is achieved, and the stability of the hole wall can be enhanced, instant instability can be resisted, and the anti-collapse function can be enhanced. And the positioning support part can be anchored on the hole wall through the deformation extrusion anchor rod of the deformation thin plate after grouting, and forms a whole with the hole wall, so that the support capability and the stability and reliability are improved.

Description

Technical Field

[0001] This invention relates to the field of borehole wall support devices, specifically to an active borehole wall support device for SDDC pile construction. Background Technology

[0002] Extremely thick fill strata are widely found in engineering backfilling, mine dumping, river regulation and other scenarios. Their strata structure is loose and uneven, with gravel, silty clay, fine sand, coal gangue and other materials interspersed in the fill. The structure is loose and has extremely poor self-stability.

[0003] SDDC piles are a foundation treatment technology that involves first drilling a hole in the foundation, then inserting a heavy hammer into the hole, and simultaneously adding material for treatment or layering fill material for subsequent treatment, ultimately forming a high-bearing-capacity, dense pile body and strongly compacted soil between the piles. Currently, when using SDDC piles to treat foundations in ultra-thick fill strata, the core challenge is the instability of the hole wall and the tendency for the hole to collapse. When drilling with conventional rotary drilling rigs, and during the filling and compaction process after drilling, the hole wall, without support, is easily affected by lateral stress of the soil, vibration, and groundwater, which can lead to local collapse or even continuous collapse, increasing rework costs and safety risks.

[0004] To address the aforementioned shortcomings, steel casings are currently widely used for borehole wall support. However, this method has several drawbacks: conventional steel casings have high initial costs, require recycling, increase construction steps, lead to long operation cycles, and present complex and difficult recycling processes. Therefore, we are considering designing an alternative to steel casings that can provide borehole wall support, thereby improving construction safety and efficiency. In light of this, we propose an active borehole wall support device for SDDC pile construction. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings mentioned in the background art and provide an active borehole support device for SDDC pile construction.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: An active borehole support device for SDDC pile construction includes: A plastic casing is used to support the borehole wall. It has at least one groove near the borehole wall and a grouting cavity for filling slurry is provided inside the plastic casing. A side through hole is provided to connect the grouting cavity and the groove. The positioning support includes a deformable thin plate disposed in the groove and located outside the side through hole, and the deformable thin plate is provided with a plurality of anchor rods on the side near the hole wall; When grout is injected into the grouting cavity, the filling grout squeezes the deformable thin plate outward along the side through hole and drives the anchor rod to anchor to the hole wall.

[0007] Preferably, the outer wall of the plastic casing is provided with a grout drain hole that is connected to the grouting cavity. The grout drain hole is used to fill the space between the plastic casing and the hole wall with the filling grout for overall curing.

[0008] Preferably, the upper and lower ends of the plastic protective sleeve are respectively provided with positioning protrusions and a discharge groove for mutual locking, and the positioning protrusions are provided with grouting ports; The grouting port, the discharge channel, and the grouting cavity are connected.

[0009] Preferably, the outer wall of the plastic protective sleeve is provided with uniformly distributed protruding ridges, which are used to increase the surface area in contact with the filling slurry.

[0010] Preferably, the deformable thin plate adopts an arc-shaped concave plate structure that is recessed inward and fixedly connected to the groove wall at both ends; When grouting is not performed, the outer end of the anchor bolt installed on the deformable thin plate does not exceed the outer diameter of the plastic casing.

[0011] Preferably, an outer cover is detachably installed at the groove, and the outer cover and the plastic protective cylinder form a cylindrical structure to maintain the continuity of the outer wall.

[0012] Preferably, the outer cover is provided with an open groove corresponding to the horizontal position of the anchor rod.

[0013] Preferably, the filling slurry is any one of fiber concrete, foamed concrete, expansive concrete, or quick-setting concrete.

[0014] Preferably, the deformable sheet is any one of polypropylene sheet, ABS sheet, or aluminum sheet that can be bent outwards.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. The active borehole support device for SDDC pile construction can replace steel casing with plastic casing, eliminating the need for recycling, simplifying construction costs, and improving construction efficiency. 2. Plastic casing can inject infiltrated grout into the soil around the borehole wall to form a solidified filling structure, thereby achieving lateral restraint, which helps to enhance the stability of the borehole wall itself, resist instantaneous instability, and strengthen the anti-collapse function. 3. The positioning support section is provided, which can be anchored to the hole wall by deforming the thin plate and compressing the anchor rod after grouting, forming an integral part with the hole wall, thereby improving the support capacity and stability reliability. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a top view of the overall structure of the present invention; Figure 3 This is an exploded view of the overall structure of the present invention; Figure 4 This is a cross-sectional view of the overall structure of the present invention; Figure 5 This is a cross-sectional view of the overall structure of the present invention; Figure 6 This is a cross-sectional view of the plastic protective sleeve of the present invention; Figure 7 This is a diagram showing the installation relationship between the deformable thin plate, anchor bolt, and outer cover of the present invention. The meanings of the labels in the diagram are as follows: 1. Plastic casing; 11. Raised rib; 101. Groove; 102. Grouting cavity; 103. Side through hole; 104. Lower discharge groove; 12. Positioning protrusion; 121. Grouting port; 2. Outer cover; 21. Open groove; 3. Deformation thin plate; 4. Anchor bolt. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figures 1-7 The present invention will describe the above technical solution in detail through the following embodiments: This embodiment of the active borehole support device for SDDC pile construction includes a plastic casing 1 that matches the diameter of the SDDC pile construction borehole. It is made of plastic and can be used as filler during the subsequent compaction process. Compared with steel casings, it does not need to be removed and recycled, which can save process. Moreover, the plastic material has a lower cost than recycling construction and is also conducive to improving the construction process and avoiding the problem of borehole wall collapse during recycling.

[0019] Specifically, in this embodiment, four grooves 101 are provided on the side of the plastic casing 1 near the hole wall. An outer cover 2 is detachably installed in the grooves 101 by screws. After the outer cover 2 is installed, it can form a cylindrical structure with a continuous outer diameter with the plastic casing 1, which can maintain vertical insertion. Considering the need to provide support for the plastic structure, a grouting cavity 102 for filling grout is provided inside the plastic casing 1. In this embodiment, positioning protrusions 12 and lower discharge slots 104 are provided at the upper and lower ends of the plastic casing 1, respectively. A grouting port 121 is provided in the positioning protrusions 12. The grouting port 121, the lower discharge slot 104 and the grouting cavity 102 are connected. The plastic casing 1 from top to bottom can be interlocked by the positioning protrusions 12 and the lower discharge slots 104, forming a continuous grouting structure, which facilitates the completion of all grouting from top to bottom.

[0020] To better securely connect the support device to the borehole wall, this embodiment provides a grout drain hole on the outer wall of the plastic casing 1, which is connected to the grouting chamber 102. The outer wall of the plastic casing 1 also features uniformly distributed protruding blocks 11. Expansive concrete is used; the grout flows along the drain hole to the gap between the borehole wall and the casing wall, solidifies and expands, and the protruding blocks 11 increase the contact area, thus forming a continuous and compact fixed structure between the support device and the borehole wall, creating an integrated support and preventing borehole wall collapse.

[0021] To ensure the stability of the support device under external forces during compaction and prevent overall collapse due to settlement, displacement, or other factors, it is necessary to improve the positioning reliability between the support device and the borehole wall. Therefore, in this embodiment, a side through hole 103 is provided between the grouting cavity 102 and the groove 101. Figures 5-7 The structure shown includes a positioning support unit comprising a deformable thin plate 3 disposed within the groove 101 and located outside the side through hole 103. The deformable thin plate 3 is an arc-shaped concave plate structure that is recessed inward and fixedly connected at both ends to the groove wall of the groove 101. In order to obtain the deformation capacity, it needs to have toughness. Therefore, in this embodiment, a polypropylene plate is used, with both ends of the plate fixedly connected to the groove 101. When grouting is performed, the grout leaking out of the side through hole 103 will squeeze the deformable thin plate 3 to bulge outward, thereby driving the fixedly connected plastic anchor rod 4 to be inserted outward and anchored into the hole wall. At the same time, the solidified concrete expands the overall support range and improves the reliability of the support. When grouting is not performed, the outer end of the anchor rod 4 does not exceed the outer diameter of the plastic casing 1 to avoid affecting the insertion process. An open groove 21 corresponding to the anchor rod 4 is provided on the outer cover 2 to facilitate the anchor rod 4 to be squeezed out and inserted into the hole wall to complete the fixation.

[0022] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0023] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. An active borehole wall support device for SDDC pile construction, characterized in that: include: A plastic casing (1) is used to support the hole wall. At least one groove (101) is provided near the hole wall, and the inside of the plastic casing (1) is provided with a grouting cavity (102) for filling the filling slurry. A side through hole (103) is provided between the grouting cavity (102) and the groove (101). The positioning support includes a deformable thin plate (3) disposed in the groove (101) and located outside the side through hole (103), and the deformable thin plate (3) is provided with a plurality of anchor rods (4) near the hole wall. When grout is injected into the grouting cavity (102), the filling grout squeezes the deformable thin plate (3) outward along the side through hole (103) and drives the anchor rod (4) to anchor on the hole wall.

2. The active borehole wall support device for SDDC pile construction as described in claim 1, characterized in that: The outer wall of the plastic casing (1) is provided with a grout drain hole that is connected to the grouting cavity (102). The grout drain hole is used to fill the space between the plastic casing (1) and the hole wall with the filling grout for overall curing.

3. The active borehole wall support device for SDDC pile construction as described in claim 2, characterized in that: The plastic protective sleeve (1) is provided with positioning protrusions (12) and a lower discharge groove (104) at the upper and lower ends respectively for mutual locking. The positioning protrusions (12) are provided with grouting ports (121). The grouting port (121), the discharge channel (104), and the grouting cavity (102) are connected.

4. The active borehole wall support device for SDDC pile construction as described in claim 3, characterized in that: The outer wall of the plastic protective sleeve (1) is provided with uniformly distributed protruding ridges (11), which are used to increase the surface area in contact with the filling slurry.

5. The active borehole wall support device for SDDC pile construction as described in claim 1, characterized in that: The deformable thin plate (3) adopts an arc-shaped concave plate structure that is recessed inward and fixedly connected at both ends to the groove wall of the groove (101); When grouting is not performed, the outer end of the anchor rod (4) installed on the deformable thin plate (3) does not exceed the outer diameter of the plastic casing (1).

6. The active borehole wall support device for SDDC pile construction as described in claim 5, characterized in that: An outer cover (2) is detachably installed at the groove (101), and the outer cover (2) and the plastic protective tube (1) together form a cylindrical structure for maintaining the continuity of the outer wall.

7. The active borehole wall support device for SDDC pile construction as described in claim 6, characterized in that: The outer cover (2) is provided with an open groove (21) corresponding to the horizontal position of the anchor rod (4).

8. The active borehole wall support device for SDDC pile construction as described in claim 1, characterized in that: The filling slurry is any one of fiber concrete, foamed concrete, expansive concrete, or quick-setting concrete.

9. The active borehole wall support device for SDDC pile construction as described in claim 5, characterized in that: The deformable sheet (3) is made of any one of polypropylene sheet, ABS sheet, or aluminum sheet that can be bent outwards.

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