Soft stratum reinforced concrete film bag cast-in-place pile forming device

Abstract

The utility model relates to a soft stratum reinforced concrete film bag cast-in-place pile forming device which is composed of a reinforcement cage, a bottom plate, a film bag, a guide pipe, a grouting pipe and a built-in nail, a rectangular movable groove is formed in a bottom plate combination body formed by a lower plate and an upper plate through a welding seam, a through guide pipe hole is formed in the center of the combination body, a rubber plug is arranged in the movable groove, and the film bag is arranged in the rubber plug. The bottom of the film bag is fixed in a clamping groove of the bottom plate through a rib belt, and the upper portion of the film bag is fixed to the reinforcement cage. According to the soft stratum reinforced concrete film bag cast-in-place pile forming device, in the cast-in-place pile hole lowering process, clear water is injected into a film bag, bottom wall protection slurry is sucked through a guide pipe, replacement of the clear water and the wall protection slurry is completed, during concrete pouring, the guide pipe rotates reversely to be separated from a bottom plate, and a rubber plug moves to seal a guide pipe hole; the film bag isolates mud sediment and other sundries, the pile forming quality is improved, a film bag variable-diameter expansion body is formed through post-grouting, and the pile foundation bearing capacity is improved.

Description

Technical Field

[0001] This utility model relates to the construction of bored cast-in-place piles, specifically to a pile-forming device for reinforced concrete membrane bag cast-in-place piles in soft strata with high water content, high sensitivity, low strength, and easy shrinkage. Background Technology

[0002] When constructing cast-in-place pile foundations in soft soil strata such as high-moisture-content soft soil, silt soil, saline soil, and fractured areas, quality problems such as concrete leakage and cross-contamination are highly likely to occur, making construction difficult; improper handling can even lead to safety accidents such as borehole collapse. Wrapping the cast-in-place pile with a membrane bag can effectively prevent concrete leakage and protect the quality of the cast-in-place pile from the negative impact of soft soil, silt soil, saline soil, and fractured areas. Traditionally, membrane bags are tied to the reinforcing cage and lowered together with it. Concrete is poured inside the membrane bag, and the bottom of the bag is connected to the mud slurry. However, this still cannot prevent the slurry circulation from affecting the inside of the bag, which may lead to mud skin and slag inclusions in the pile body, affecting the construction quality of the cast-in-place pile. Furthermore, the bottom of the membrane bag is not sealed, and the bottom of the pile is a weak point, which may pose a hidden danger to the quality and safety of the pile foundation project. During the lowering process, there is a lot of friction between the membrane bag and the pile hole. The bag sinks due to the weight of the reinforcing cage and the membrane bag itself, which affects the lowering efficiency and increases the risk of collapse after the pile hole is completed. The membrane bag only plays a role in wrapping and blocking around the pile, and does not make full use of the material properties of the membrane bag.

[0003] To improve the construction quality, efficiency, and safety of reinforced concrete bag-supported piles in soft soil, and to fully utilize the material properties of the bag, it is necessary to optimize and improve the pile-forming device. Utility Model Content

[0004] The purpose of this invention is to address the problems existing in the construction of membrane bag cast-in-place piles, such as mud skin, slag inclusions, slow lowering speed, and insufficient utilization of membrane bag material properties, and to propose a pile-forming device for reinforced concrete membrane bag cast-in-place piles in soft strata.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This utility model relates to a pile-forming device for reinforced concrete membrane bag cast-in-place piles in soft soil strata, which includes a reinforcing cage, a bottom plate, a membrane bag, a guide pipe, a grouting pipe, and embedded nails.

[0007] The base plate includes a lower plate and an upper plate, which are welded together to form an assembly. A rectangular movable groove is provided inside the assembly, and a through guide hole is provided in the center of the assembly. The inner wall of the guide hole located at the lower plate is provided with connecting threads, and a slot is provided on the outer edge of the lower plate.

[0008] The fixing pins are located at the lower part of the base plate;

[0009] The movable slot is internally provided with a rubber plug, the rubber plug is connected to the side of the movable slot through a snap spring and a hook provided at the corresponding position of the side of the movable slot and the rubber plug; the other side of the rubber plug in the movable slot is further provided with a sliding rod, the sliding rod rolls left and right in the movable slot;

[0010] The steel reinforcement cage comprises main reinforcement and stirrup, two vertical grouting pipes are symmetrically arranged between the main reinforcement, the grouting pipes are fixed with the stirrup, the grouting pipes are uniformly provided with horizontal nozzles with one-way grouting membrane along the pipe body, and the bottom of the main reinforcement is connected with the bottom plate.

[0011] The membrane bag is fixed at the bottom of the bottom plate through the rib belt in the clamping groove, and is fixed at the upper part of the steel reinforcement cage.

[0012] The bottom of the guide pipe is connected with the inner wall of the guide pipe hole through a connecting thread.

[0013] Preferably, the number of the embedded nails is 3-4, and the length is 0.5 m.

[0014] Preferably, the middle part of the rubber plug is a cylinder, the upper and lower ends are symmetrically circular truncated cones, and the diameter of the cylinder is the same as the width of the movable slot.

[0015] Preferably, the sliding rod is a rod body with a middle cylindrical shape and hemispherical shapes at both ends, the length of the sliding rod is the same as the width of the movable slot, and the diameter of the sliding rod is the same as the height of the movable slot.

[0016] Preferably, the guide pipe comprises a plurality of guide pipe units, the bottom of the guide pipe unit is provided with an external thread, the top is provided with an enlarged end, the inner side of the enlarged end is provided with an internal thread, and the guide pipe units are connected in series through the external thread and the internal thread.

[0017] Preferably, the inner wall of the guide pipe hole on the lower plate is provided with a connecting thread matched with the external thread of the guide pipe, and the guide pipe hole on the upper plate is not provided with a connecting thread.

[0018] Preferably, the outer surface of the membrane bag is in the shape of a thread or a gourd string.

[0019] Preferably, the horizontal nozzle of the grouting pipe is located between the adjacent rib belts of the membrane bag.

[0020] In the process of lowering the cast-in-place pile hole, the soft soil stratum reinforced concrete membrane bag pile forming device injects clean water into the membrane bag, the bottom of the guide pipe is threadedly connected with the bottom plate, and the guide pipe blocks the sliding rod, the rubber plug and the compressed snap spring on one side; the liquid level of the clean water in the membrane bag is always higher than the top of the cast-in-place pile hole, a water head difference is formed between the inside and outside of the membrane bag, the bottom wall protection slurry is sucked through the guide pipe, and the replacement of the clean water and the bottom wall protection slurry is completed; when pouring concrete, the guide pipe is reversely rotated and separated from the bottom plate, the rubber plug and the sliding rod move to the side of the guide pipe hole under the action of the elastic force of the snap spring, and finally the upper and lower end circular truncated cones of the rubber plug are filled in the guide pipe hole to seal the guide pipe hole.

[0021] The utility model relates to technical schemes, and the beneficial effect compared with the traditional technology is:

[0022] 1, the utility model relates to the bottom plate central part of soft weak stratum reinforced concrete membrane bag bored pile forming device is provided with the duct hole, and is connected duct, and through mud pump suction bored pile hole mud in the process of putting down reinforced cage membrane bag, and injects clear water in the membrane bag inside, and the water head difference of inside and outside side accelerates the putting down efficiency of reinforced cage and membrane bag, reduces the construction period, effectively reduces the pile hole collapse risk, improves the bored pile construction safety.

[0023] 2, the utility model relates to the soft weak stratum reinforced concrete membrane bag bored pile forming device, including the membrane bag, the membrane bag is fixed in the clamping groove of bottom plate through the rib band in the bottom, is fixed on the reinforced cage in the upper portion, can inject clear water through the membrane bag, and the mud replacement of bored pile hole mud is completed by sucking mud outside the membrane bag, and there is no mud residue and other sundries in the membrane bag, reduces the broken pile, mud skin, clamping residue and so on phenomenon, and the bored pile body effect is good; The membrane bag can effectively avoid the influence of high water content soft soil layer, silt stratum, saline soil stratum, broken zone and other soft weak strata on the bored pile, and also can be directly used to improve the bearing capacity of the bored pile, and the application range is wide; The membrane bag is processed into the thread or calabash string shape along the bored pile body in the factory, carries out high pressure post grouting through the grouting pipe after concrete is poured, and the membrane bag wraps the expansion grouting body and forms the thread or calabash string and so on variable diameter shape along the pile height direction, improves the side frictional resistance of the bored pile and the soil body around the pile, and the structure is reliable, and the construction difficulty is small.

[0024] 3, the utility model relates to the soft weak stratum reinforced concrete membrane bag bored pile forming device's duct is connected in the bottom plate through screw thread, and sucks the mud of protective wall when putting down, after the reinforced cage is put down to the hole bottom, can through high pressure flush the bottom of the pile hole, reduce the sediment of the pile bottom; The duct is used for concrete pouring after being removed by reverse rotation, effectively improves the utilization effect of the duct.

[0025] 4, the utility model relates to the soft weak stratum reinforced concrete membrane bag bored pile forming device's bottom plate inside is provided with movable groove and rubber plug, during the removal process of the duct, the rubber plug immediately seals the duct hole of the bottom plate central part, effectively avoids the mud residue into the membrane bag. ACCURACY OF DRAWINGS

[0026] Figure 1 It is soft weak stratum reinforced concrete membrane bag bored pile forming device schematic diagram;

[0027] Figure 2 It is duct unit and up and down connection screw thread schematic diagram;

[0028] Figure 3 It is bottom plate structure schematic diagram;

[0029] Figure 4 It is lower plate lower view;

[0030] Figure 5 is a lower plate bottom view;

[0031] Figure 6 is a lower plate sectional view;

[0032] Figure 7 is an upper plate bottom view;

[0033] Figure 8 is an upper plate top view;

[0034] Figure 9 is an upper plate sectional view;

[0035] Figure 10 is a bottom plate and conduit connection view;

[0036] Figure 11 is a bottom plate rubber plug in retracted state sectional view;

[0037] Figure 12 is a bottom plate rubber plug in retracted state plan view;

[0038] Figure 13 is a bottom plate rubber plug in plugging conduit hole state sectional view;

[0039] Figure 14 is a bottom plate rubber plug in plugging conduit hole state plan view;

[0040] Figure 15 is a rubber plug three-dimensional view;

[0041] Figure 16 is a water displacement mud in the pile-forming device droping diagram;

[0042] Figure 17 is a finally formed reinforced concrete membrane bag bored pile diagram.

[0043] Marked in the figure: 1 - cast-in-place concrete, 2 - expanded grouting body, 3 - reinforcement cage, 4 - embedded nail, 5 - bottom plate, 501 - lower plate, 502 - upper plate, 503 - movable groove, 504 - clamping groove, 505 - conduit hole, 506 - connecting thread, 507 - welding seam, 6 - rubber plug, 601 - circular table, 602 - circular column, 7 - sliding rod, 8 - clamping spring, 801 - hanging buckle, 9 - water, 901 - water liquid level, 10 - membrane bag, 11 - rib belt, 12 - bored pile hole, 13 - retaining wall mud, 14 - conduit, 1401 - enlarged end, 1402 - internal thread, 1403 - external thread, 15 - weak soil layer, 16 - hard soil layer, 17 - grouting pipe. DETAILED DESCRIPTION

[0044] In order to deepen the understanding of the present application, the following will be described with reference to the accompanying drawings Figures 1 to 17The embodiments of this utility model will be described in detail below. The following embodiments are implemented based on the technical solution of this utility model and provide detailed implementation methods. However, the protection scope of this utility model is not limited to the following embodiments.

[0045] In this embodiment, the diameter of the grouting pile hole 12 is 1.5m and the depth is 20m. The length of the grouting pipe 17 is 20m, and horizontal nozzles are set at 1m intervals. The diameter of the reinforcing cage 3 is 1.4m and the thickness of the protective layer is 5cm. The bottom plate 5 connected to the bottom of the reinforcing cage 3 has a diameter of 1.42m and a height of 5cm, of which the lower plate 501 has a height of 3.5cm and the upper plate 502 has a height of 1.5cm. The diameter of the outer membrane bag 10 of the reinforcing cage 3 is 1.6m to ensure the expansion space after grouting. The length of the membrane bag 10 is 22m, and ribs 11 are set at 1m intervals. The length of a single section of the guide pipe 14 is 2m and the diameter is 15cm. The pile is surrounded by a soft soil layer 15 and the bottom of the pile is a hard soil layer 16.

[0046] Combined with appendix Figure 1 As shown, the pile-forming device for reinforced concrete membrane bag cast-in-place piles in weak strata consists of a reinforcing cage 3, a base plate 5, a membrane bag 10, a guide pipe 14, a grouting pipe 17, and embedding nails 4. The embedding nails 4 are located at the bottom of the base plate 5, with 3 to 4 nails and a length of 0.5m.

[0047] Combined with appendix Figure 2 As shown, the conduit 14 is composed of multiple conduit units connected end-to-end by a spiral. The conduit length is 50-100cm longer than the reinforcing cage 3. Each conduit unit has an external thread 1403 at the bottom and an enlarged end 1401 at the top, with an internal thread 1402 on the inner side of the enlarged end. The connecting thread 506 on the inner wall of the conduit hole 505 on the lower plate 501 matches the external thread 1403 of the conduit, while the conduit hole 505 on the upper plate 502 has no connecting thread. (See attached diagram.) Figure 10 As shown, the bottom of the conduit 14 is connected to the inner wall of the conduit hole 505 by a connecting thread 506.

[0048] Combined with appendix Figure 3 -Appendix Figure 9 As shown, the base plate 5 is formed by the lower plate 501 and the upper plate 502 through the weld seam 507. A rectangular movable groove 503 is provided inside the assembly. A through guide hole 505 is provided in the center of the assembly. The inner wall of the guide hole 505 located at the lower plate 501 is provided with a connecting thread 506. A slot 504 is provided on the outer edge of the lower plate.

[0049] The movable groove 503 is equipped with a rubber stopper 6. The rubber stopper 6 has a cylinder 602 in the middle and symmetrical frustums 601 at the top and bottom ends, as shown in the attached figure. Figure 15 As shown, the diameter of the cylinder 602 is the same as the width of the movable groove 503. The rubber plug 6 is connected to the side of the movable groove 503 by a snap ring 8 and hooks 801 located at corresponding positions on the sides of the movable groove 503 and the rubber plug 6.

[0050] The other side of the rubber plug 6 in the movable slot 503 is also provided with a sliding rod 7, the sliding rod 7 is a rod body with a middle cylindrical shape and two hemispherical ends, the length of the sliding rod 7 is the same as the width of the movable slot 503, and the diameter of the sliding rod 7 is the same as the height of the movable slot 503, and the sliding rod 7 rolls left and right in the movable slot 503.

[0051] The drawings are combined Figure 1 As shown in the drawings, the membrane bag 10 is fixed in the clamping slot 504 of the bottom plate 5 through the rib belt 11 at the bottom and is fixed on the reinforcement cage 3 at the upper part; the reinforcement cage 3 comprises main reinforcement and stirrup, two vertical grouting pipes 17 are symmetrically arranged between the main reinforcement, the grouting pipe 17 is fixed with the stirrup, the length of the grouting pipe 17 is the same as that of the main reinforcement, the grouting pipe 17 is uniformly provided with horizontal nozzles with one-way grouting film along the pipe body, and the bottom of the main reinforcement is connected with the bottom plate 5. The outer surface of the membrane bag 10 is in a screw shape, a gourd string or other variable-diameter shape, and after high-pressure grouting through the grouting pipe 17, a variable-diameter expansion grouting body 2 is formed outside the cast-in-place concrete pile body. The horizontal nozzle of the grouting pipe 17 faces the outside of the bored pile hole, and is located between the adjacent rib belts 11 of the membrane bag 10.

[0052] The drawings are combined Figure 16 As shown in the drawings, during the process of lowering the bored pile hole 12, the membrane bag 10 is injected with clean water 9, the bottom of the guide pipe 14 is threadedly connected with the bottom plate 5, and the guide pipe 14 blocks the sliding rod 7, the rubber plug 6 and the compression state of the clamping spring 8 on one side, as shown in the drawings Figure 11 - the drawings Figure 12 As shown in the drawings, the liquid level of the clean water in the membrane bag 10 is always higher than the top of the bored pile hole, a water head difference is formed inside and outside the membrane bag 10, the bottom wall protection slurry 13 is sucked through the guide pipe 14, and the replacement of the clean water 9 and the bottom wall protection slurry 13 is completed; when the concrete is poured, the guide pipe 14 is reversely rotated and separated from the bottom plate 5, and the rubber plug 6 and the sliding rod 7 move to the side of the guide pipe hole 505 under the elastic force of the clamping spring 8, as shown in the drawings Figure 13 - the drawings Figure 14 As shown in the drawings, finally, the upper and lower end circular tables 601 of the rubber plug 6 are filled in the guide pipe hole 505, and the guide pipe hole 505 is closed.

[0053] The drawings are combined Figure 17 As shown in the drawings, after the membrane bag 10 is filled with the concrete, when the strength reaches 85% of the standard strength, a variable-diameter expansion grouting body 2 is formed outside the cast-in-place concrete pile body through high-pressure grouting through the grouting pipe 17, and finally the reinforced concrete membrane bag bored pile is formed.

[0054] The above examples are only used to explain the technical concept of the utility model, and are not limited to the protection of the utility model, and any non-substantial change to the utility model by using the concept should fall within the protection scope of the utility model.

Claims

1. A pile-forming device for reinforced concrete membrane bag cast-in-place piles in soft soil strata, characterized in that: It includes a steel cage (3), a bottom plate (5), a membrane bag (10), a guide pipe (14), a grouting pipe (17), and a fastening nail (4). The base plate (5) includes a lower plate (501) and an upper plate (502). The lower plate (501) and the upper plate (502) are connected by a weld (507) to form an assembly. A rectangular movable groove (503) is provided inside the assembly. A through guide hole (505) is provided in the center of the assembly. The inner wall of the guide hole (505) located at the lower plate (501) is provided with a connecting thread (506). A slot (504) is provided on the outer edge of the lower plate (501). The embedded nail (4) is located at the lower part of the base plate (5); The movable groove (503) is provided with a rubber plug (6), which is connected to the side of the movable groove (503) by a snap ring (8) and hooks (801) located at corresponding positions on the sides of the movable groove (503) and the rubber plug (6); a sliding rod (7) is also provided on the other side of the movable groove (503) next to the rubber plug (6), which rolls left and right in the movable groove (503); The steel cage (3) includes main bars and stirrups. Two vertical grouting pipes (17) are symmetrically arranged between the main bars. The grouting pipes (17) are fixed to the stirrups. The grouting pipes (17) are evenly provided with horizontal nozzles with one-way grout-stopping membranes along the pipe body. The bottom of the main bars is connected to the bottom plate (5). The membrane bag (10) is fixed at the bottom in the slot (504) of the bottom plate (5) by the rib (11) and at the top to the steel cage (3); The bottom of the conduit (14) is connected to the inner wall of the conduit hole (505) by a connecting thread (506).

2. The pile-forming device for reinforced concrete membrane bag cast-in-place piles in weak strata according to claim 1, characterized in that: The number of the embedded nails (4) is 3 to 4, and the length is 0.5m.

3. The pile-forming device for reinforced concrete membrane bag cast-in-place piles in weak strata according to claim 1, characterized in that: The rubber stopper (6) has a cylinder (602) in the middle and symmetrical frustums (601) at the top and bottom. The diameter of the cylinder (602) is the same as the width of the movable groove (503).

4. The pile-forming device for reinforced concrete membrane bag cast-in-place piles in weak strata according to claim 1, characterized in that: The slide bar (7) is a rod with a cylindrical shape in the middle and hemispherical shapes at both ends. The length of the slide bar (7) is the same as the width of the movable groove (503), and the diameter is the same as the height of the movable groove (503).

5. The pile-forming device for reinforced concrete membrane bag cast-in-place piles in weak strata according to claim 1, characterized in that: The catheter (14) includes multiple catheter units. The bottom of the catheter unit is provided with an external thread (1403) and the top is provided with an enlarged end (1401). The inner side of the enlarged end (1401) is provided with an internal thread (1402). The catheter units are connected end to end by the external thread (1403) and the internal thread (1402).

6. The pile-forming device for reinforced concrete membrane bag cast-in-place piles in soft strata according to claim 5, characterized in that: The inner wall of the guide hole (505) on the lower plate (501) is provided with a connecting thread that matches the external thread (1403) of the guide (14), while the guide hole (505) on the upper plate (502) has no connecting thread.

7. The pile-forming device for reinforced concrete membrane bag cast-in-place piles in weak strata according to claim 5, characterized in that: The outer surface of the membrane bag (10) is threaded or gourd-shaped.

8. The pile-forming device for reinforced concrete membrane bag cast-in-place piles in weak strata according to claim 5, characterized in that: The horizontal nozzle of the grouting pipe (17) is located between the adjacent ribs (11) of the membrane bag.

Images