Cast-in-place pile structure frame for karst area and concrete cast-in-place pile

Abstract

The utility model provides a cast-in-place pile structure frame for a karst area and a concrete cast-in-place pile. The cast-in-place pile structure frame for the karst area comprises a reinforcement cage and a corrugated pipe, and the reinforcement cage is used for being arranged in a pile hole; the corrugated pipe sleeves the outer side of the reinforcement cage and is connected with the reinforcement cage; the corrugated pipe is made of plastic, and the pipe wall of the corrugated pipe is of a concave-convex alternating structure in the axial direction. The corrugated pipe is located at the position, corresponding to the karst cave, of the reinforcement cage, and the two ends of the corrugated pipe protrude out of the karst cave. The corrugated pipe is arranged at the karst cave to prevent concrete from flowing into the karst cave in the pouring process, so that backfilling is avoided, the construction efficiency is improved, and the construction cost is reduced; the corrugated pipe is made of plastic materials, low in cost, good in corrosion resistance and light in weight, the corrugated pipe can be installed on the reinforcement cage on the ground, the corrugated pipe and the reinforcement cage are integrally hoisted and placed into a pile hole, and construction is convenient. The pipe wall of the corrugated pipe is of a concave-convex alternating structure in the axial direction, the structural strength is large, and large extrusion force of concrete can be borne.

Description

Technical Field

[0001] The utility model relates to the field of cast-in-place piles, and particularly relates to a cast-in-place pile structure frame and a cast-in-place concrete pile for karst areas. Background Art

[0002] There are karst caves in karst areas. When constructing cast-in-place concrete piles in karst areas, backfilling measures are mainly taken. This construction method has a long construction period. Especially when the karst cave is large, backfilling requires a large amount of time and high economic costs. In the prior art, a concrete casing can be used to prevent the concrete from flowing into the karst cave, but the concrete casing is heavy, and it is difficult to sink the pipe. It is not easy to position it at a suitable position in the karst cave, which increases the construction difficulty, and the cost of the concrete casing is relatively high. Content of the Utility Model

[0003] The utility model provides a cast-in-place pile structure frame and a cast-in-place concrete pile for karst areas.

[0004] On the one hand, the utility model provides a cast-in-place pile structure frame for karst areas. There is a pile hole penetrating through a karst cave in the karst area. The cast-in-place pile structure frame includes a steel reinforcement cage and a corrugated pipe. The steel reinforcement cage is used to be arranged in the pile hole; the corrugated pipe is sleeved outside the steel reinforcement cage and the two are connected; the corrugated pipe is made of plastic, and its pipe wall is in an alternating concave and convex structure along the axial direction; the corrugated pipe is located at a position corresponding to the karst cave of the steel reinforcement cage, and both ends of the corrugated pipe protrude out of the karst cave.

[0005] Wherein, the length of the corrugated pipe is equal to or greater than the sum of the height of the karst cave and twice the aperture of the pile hole.

[0006] Wherein, the size that the top end of the corrugated pipe protrudes upward out of the karst cave is greater than or equal to the aperture of the pile hole;

[0007] The size that the bottom end of the corrugated pipe protrudes downward out of the karst cave is greater than or equal to the aperture of the pile hole.

[0008] Wherein, the alternating concave and convex structure of the corrugated pipe includes a first concave part and a first convex part. The first convex part protrudes outwards relative to the first concave part. Both the first concave part and the first convex part are in a spiral shape around the axial direction of the corrugated pipe and are alternately connected.

[0009] Wherein, the outer diameter of the corrugated pipe is smaller than the aperture of the pile hole. A spiral outer belt is arranged on the outer side of the top end of the corrugated pipe; the spiral outer belt is made of plastic, is in a spiral shape, and the number of spiral turns is more than 1.5 turns, and it extends along the spiral direction of the first concave part and the first convex part; the lower side of the spiral outer belt is fixedly connected with the first convex part, and the upper side protrudes outwards from the first convex part and is arranged corresponding to the first concave part in the radial direction.

[0010] Among them, the spiral outer belt includes a second concave portion and a second convex portion. The second concave portion is connected in parallel to the lower side of the second convex portion, and the lower side of the second concave portion is fixedly connected to the first convex portion; the cross-section of the second convex portion protrudes outward from the second concave portion in a convex arc shape and is arranged at an interval from the first concave portion;

[0011] Or,

[0012] The spiral outer belt is in a straight shape with an outward inclination on the upper side.

[0013] Among them, the cross-section of the first convex portion protrudes outward from the pipe in a convex arc shape, and the lower side of the spiral outer belt is connected to the lower side of the first convex portion.

[0014] Among them, a first connection hole and a second connection hole are provided at the lower side edge of the first convex portion; the corrugated pipe is fixedly connected to the steel reinforcement cage through a connecting rib. The connecting rib includes a first connecting section, a second connecting section, and a third connecting section; the first connecting section passes through the first connection hole; the second connecting section is located outside the corrugated pipe and extends along the lower side edge of the first convex portion. One end of the second connecting section is connected to the first connecting section; the third connecting section passes through the second connection hole, one end of which is connected to the other end of the second connecting section and the other end is fixedly connected to the steel reinforcement cage.

[0015] Among them, the axial two ends of the corrugated pipe are connected to the steel reinforcement cage.

[0016] On the other hand, the present invention provides a cast-in-place concrete pile, including the pile structure frame for karst areas described above. The pile structure frame is arranged in a pile hole, and concrete is poured into the pile hole.

[0017] The pile structure frame for karst areas and the cast-in-place concrete pile provided by the present invention prevent concrete from flowing into the karst cave during the pouring process by arranging a corrugated pipe at the karst cave, avoiding backfilling, improving construction efficiency, and reducing construction costs; the corrugated pipe is made of plastic material, with low cost, good corrosion resistance, and light weight. The corrugated pipe can be installed on the steel reinforcement cage on the ground and hoisted into the pile hole as a whole with the steel reinforcement cage, which is convenient for construction; the pipe wall of the corrugated pipe has an alternating concave and convex structure along the axis, with relatively high structural strength and can withstand the extrusion pressure of a large amount of concrete. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the pile structure frame in the pile hole provided by a preferred embodiment of the present invention;

[0019] Figure 2 It is Figure 1 a schematic diagram of the structure of the pile structure frame in

[0020] Figure 3 is Figure 2 A schematic cross-sectional view of the cast-in-place pile structure frame in

[0021] Figure 4 is Figure 2 A schematic structural view of the spiral outer belt in

[0022] Figure 5 is Figure 2 A schematic structural view of the steel reinforcement cage and connecting bars in Specific implementation manners

[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without making creative efforts fall within the protection scope of the present utility model.

[0024] In the figure, units with similar structures are denoted by the same reference numerals.

[0025] Please refer to Figure 1 and Figure 2 , a concrete cast-in-place pile of the present utility model includes a cast-in-place pile structure frame 100, which is used in a karst area. There is a pile hole 9 passing through a karst cave 8 in the karst area. The cast-in-place pile structure frame 100 is arranged in the pile hole 9, and concrete (not shown in the figure) is poured in the pile hole 9. The concrete and the cast-in-place pile structure frame 100 form a concrete cast-in-place pile in the pile hole 9. The cast-in-place pile structure frame 100 includes a steel reinforcement cage 2 and a corrugated pipe 1. The steel reinforcement cage 2 is used to be arranged in the pile hole 9 to improve the structural strength of the entire concrete cast-in-place pile. The corrugated pipe 1 is sleeved outside the steel reinforcement cage 2 and the two are connected. The corrugated pipe 1 can be lowered into the pile hole 9 together with the steel reinforcement cage 2.

[0026] The corrugated pipe 1 is made of plastic material, with low cost, good corrosion resistance, and light weight. The corrugated pipe 1 can be installed on the steel reinforcement cage 2 on the ground and hoisted and placed into the pile hole 9 as a whole with the steel reinforcement cage 2. The corrugated pipe 1 is sleeved outside the steel reinforcement cage 2 and the two are connected. The corrugated pipe 1 is located at the position corresponding to the karst cave 8 on the steel reinforcement cage 2, and both ends of the corrugated pipe protrude from the karst cave 8. When there are multiple karst caves arranged vertically in the karst cave 8, the number of corrugated pipes can be determined according to the number of karst caves, and the position of the corrugated pipe on the steel reinforcement cage can be determined according to the location of the karst cave 8, so that the karst cave and the corrugated pipe are arranged in one-to-one correspondence.

[0027] By setting the corrugated pipe 1 at the karst cave 8 and both ends of the corrugated pipe 1 protruding from the corresponding karst cave 8, it is possible to effectively prevent concrete from entering the karst cave 8 during pouring, reduce the pouring cost, eliminate the need for backfilling the karst cave, improve the construction efficiency, reduce the labor and material consumption, and shorten the construction period.

[0028] The corrugated pipe 1 can be made of plastic materials such as PVC (polyvinyl chloride), PE (polyethylene), and PP (polypropylene).

[0029] The wall of the corrugated pipe 1 has an alternating concave and convex structure along the axial direction, with relatively high structural strength and the ability to withstand the extrusion pressure of a large amount of concrete. The alternating concave and convex structure on the outer side of the corrugated pipe 1 can support the hole wall structure at the position of the karst cave 8. If the pile hole 9 at the karst cave 8 collapses, the alternating concave and convex structure can reduce the degree of soil structure sliding along the outer wall of the corrugated pipe 1 at the karst cave 8, reduce the degree of collapse, and prevent the collapse from expanding to the top of the corrugated pipe 1 and causing the poured concrete to enter the karst cave 8. At the same time, during the pouring process, the concrete that enters the gap between the corrugated pipe 1 and the pile hole 9 from the top of the corrugated pipe 1 will stay on the outer wall of the corrugated pipe 1 due to the alternating concave and convex structure and gradually solidify, thus gradually filling the gap and preventing the concrete from entering the karst cave 8.

[0030] The alternating concave and convex structure on the inner side of the corrugated pipe 1 can make the outer wall of the concrete cast-in-place pile in the corrugated pipe 1 have a concave and convex structure, improving the structural strength of the concrete cast-in-place pile.

[0031] The length of the corrugated pipe 1 is equal to or greater than the sum of the height of the karst cave 8 and twice the aperture of the pile hole 9, making the length of the corrugated pipe 1 relatively large and capable of effectively preventing concrete from entering the karst cave 8.

[0032] The size by which the top end of the corrugated pipe 1 protrudes upward from the karst cave 8 is greater than or equal to the aperture of the pile hole 9, so that there is sufficient length of the corrugated pipe 1 above the top surface of the karst cave 8. Even if the corrugated pipe 1 deforms downward, it will not cause the concrete to enter the karst cave 8 from the top of the corrugated pipe 1. And if there is a collapse at the top of the karst cave 8, the corrugated pipe 1 can also effectively support the collapsed soil. The size by which the bottom end of the corrugated pipe 1 protrudes downward from the karst cave 8 is greater than or equal to the aperture of the pile hole 9, which can prevent the concrete from overflowing into the karst cave 8 from the gap between the bottom of the corrugated pipe 1 and the wall of the pile hole 9.

[0033] The concave-convex alternating structure of the corrugated pipe 1 includes a first concave portion 11 and a first convex portion 12. The first convex portion 12 protrudes outward relative to the first concave portion 11 towards the outside of the pipe. The first concave portion 11 and the first convex portion 12 are spirally arranged and alternately connected around the axial direction of the corrugated pipe 1, facilitating the processing and preparation of the corrugated pipe 1. In this embodiment, the cross-section of the first convex portion 12 is a convex arc protruding towards the outside of the pipe, and the cross-section of the first concave portion 11 is a straight line parallel to the axial direction of the corrugated pipe 1, facilitating the processing and forming of the corrugated pipe 1. Of course, in other embodiments, the cross-section of the first concave portion 11 can also be a concave arc recessed towards the inside of the pipe.

[0034] As Figure 1 shown, the outer diameter of the corrugated pipe 1 is smaller than the diameter of the pile hole 9. As shown in combination with Figure 2 and Figure 3 shown, a spiral outer belt 4 is provided on the outer side of the top end of the corrugated pipe 1. The spiral outer belt 4 is made of plastic material, is spiral, has more than 1.5 turns, and extends along the spiral direction of the first concave portion 11 and the first convex portion 12; the lower side of the spiral outer belt 4 is fixedly connected to the first convex portion 12, and the upper side protrudes outward from the first convex portion 12 and is arranged corresponding to the first concave portion 11 in the radial direction. The spiral outer belt 4 is located on the outer side of the top of the corrugated pipe 1. When the corrugated pipe 1 is lowered into the pile hole 9, the spiral outer belt 4 can keep a certain distance between the corrugated pipe 1 and the hole wall of the pile hole 9, so that the structure of the corrugated pipe 1 below the spiral outer belt 4 does not contact the hole wall of the pile hole 9, and only the spiral outer belt 4 contacts the hole wall of the pile hole 9, thereby reducing the friction between the corrugated pipe 1 and the pile hole 9 during the lowering process, making the lowering process smoother and improving the lowering efficiency.

[0035] The spiral outer belt 4 is made of plastic material, which can make it have a certain amount of deformation. During the process of pouring concrete, the concrete overflowing from the top of the corrugated pipe 1 will flow into the gap between the spiral outer belt 4 and the corrugated pipe 1, and the gap between the corrugated pipe 1 and the pile hole 9 can be filled with concrete, avoiding the concrete from entering the karst cave 8.

[0036] The spiral outer belt 4, the first concave portion 11, and the first convex portion 12 are all spiral. The number of turns of the spiral outer belt 4 is more than 1.5 turns, and the concrete can move down along the spiral structure, enabling the concrete to enter the bottom layer of the spiral outer belt 4, further improving the connection tightness between the spiral outer belt 4 and the hole wall of the pile hole 9. The concrete gradually solidifies during the downward movement, thus ensuring that the concrete stays at the spiral outer belt 4.

[0037] The first convex portion 12 is a convex arc. The lower side of the spiral outer belt 4 is connected to the lower side of the first convex portion 12. Using the lower arc of the first convex portion 12, the upper side structure of the spiral outer belt can be naturally inclined outward, making the outer diameter of the upper side of the spiral outer belt 4 larger than the outer diameter of the corrugated pipe 1, thus facilitating the abutment against the hole wall of the pile hole.

[0038] Preferably, as Figure 4 shown, the spiral outer belt 4 includes a second concave portion 41 and a second convex portion 42. The second concave portions 41 are connected side by side under the second convex portion 42. The lower side of the second concave portion 41 is fixedly connected to the first convex portion 12. The cross-section of the second convex portion 42 protrudes outward from the second concave portion 41 in a convex arc shape, and the second convex portion 42 and the first concave portion 11 are arranged at intervals so that concrete can be accommodated therebetween.

[0039] During the process of pouring concrete, the concrete overflowing from the top of the corrugated pipe 1 will flow into the gap between the second convex portion 42 of the spiral outer belt 4 and the first concave portion 11 of the corrugated pipe 1, so that the gap between the corrugated pipe 1 and the pile hole 9 can be filled with concrete, avoiding the concrete from entering the karst cave 8. The second convex portion 42 and the first concave portion 11 are arranged at intervals, and the concrete entering between them can squeeze the second convex portion 42, causing the second convex portion 42 to deform towards the hole wall of the pile hole 9. The second convex portion 42 squeezes the hole wall of the pile hole 9, and the two are tightly connected, avoiding the concrete from flowing into the karst cave 8 from the outside of the second convex portion 42. The convex arc shape of the second convex portion 42 is convenient for retaining concrete.

[0040] The first convex portion 12 and the second concave portion 41 can be connected by riveting, or the two can be fixedly connected by hot melting.

[0041] The spiral outer belt 4 and the corrugated pipe 1 are made of the same material and adopt the structure of the second concave portion 41 and the second convex portion 42. During the construction process, the corrugated pipe 1 can be cut from the raw material of the corrugated pipe according to the height of the karst cave 8, and the remaining material after cutting can be directly used to prepare the spiral outer belt 4. Specifically, the connection between the upper edge of the first convex portion 12 and the lower edge of the first concave portion 11 is divided, and the lower edge of the first convex portion 12 and the upper edge of the first concave portion 11 remain connected to form a strip structure. The divided first convex portion forms the second convex portion, and the first concave portion forms the second concave portion. In this way, the spiral outer belt 4 is prepared, which is convenient for the processing and preparation of the spiral outer belt 4, and the remaining cutting material is fully utilized, reducing the cost. Dividing the connection between the upper edge of the first convex portion and the lower edge of the first concave portion to form a strip structure enables its diameter to be enlarged so as to be sleeved outside the corrugated pipe 1. Through the above method, the cross-section of the second concave portion 41 can be an arc bent outward from the pipe, and the cross-section of the second convex portion 42 can be a straight line.

[0042] Here, in other embodiments, the cross-section of the spiral outer belt 4 can also be a straight line as a whole. After its lower side is connected to the lower side of the first convex portion 12, the upper side of the spiral outer belt 4 inclines outward so that the structure of the spiral outer belt 4 is simpler, and a common strip structure member can be arranged along the spiral direction of the first convex portion 12.

[0043] The axial two ends of the corrugated pipe 1 are fixedly connected to the steel reinforcement cage 2. Since the corrugated pipe 1 is made of plastic material and has a relatively light weight, only by connecting the two ends of the corrugated pipe 1 to the steel reinforcement cage 2, the two can be integrally placed into the pile hole 9. Since the steel reinforcement cage 2 and the corrugated pipe 1 are relatively large in volume, the construction workers can conveniently connect the end of the corrugated pipe 1 to the steel reinforcement cage 2 outside the corrugated pipe 1 without entering the inside of the steel reinforcement cage 2 or the corrugated pipe 1, which is convenient for construction and improves efficiency.

[0044] As Figure 5 shown, a first connection hole 131 and a second connection hole 132 are provided at the lower side edge of the first convex portion 12. The corrugated pipe 1 is fixedly connected to the steel reinforcement cage 2 through a connecting rib 5. The connecting rib 5 includes a first connecting section 51, a second connecting section 52 and a third connecting section 53. The first connecting section 51 passes through the first connection hole 131. The second connecting section 52 is located outside the corrugated pipe 1 and extends along the lower side edge of the first convex portion 12. One end of the second connecting section 52 is connected to the first connecting section 51. The third connecting section 53 passes through the second connection hole 132. One end thereof is connected to the other end of the second connecting section 52, and the other end is fixedly connected to the steel reinforcement cage 2.

[0045] By using the third connecting section 53, a certain gap can be maintained between the steel reinforcement cage 2 and the corrugated pipe 1, so that a certain thickness of concrete can be accommodated between the steel reinforcement cage 2 and the corrugated pipe 1 to protect the steel reinforcement cage 2 with the concrete. Of course, an additional positioning structure such as a cross structure frame can also be provided between the steel reinforcement cage 2 and the corrugated pipe 1 to ensure a predetermined distance between the steel reinforcement cage 2 and the corrugated pipe 1.

[0046] The second connecting section 52 extends along the lower side edge of the first convex portion 12, and the second connecting section 52 can better support the first convex portion 12. The first connecting section 51 and the third connecting section 53 respectively pass through the first connection hole 131 and the second connection hole 132, which can realize a reliable connection between the connecting rib 5 and the corrugated pipe 1 and is not easy to loosen.

[0047] The aperture of the first connection hole 131 can be smaller than the diameter of the first connecting section 51, and the aperture of the second connection hole 132 can be smaller than the diameter of the third connecting section 53. When assembling the corrugated pipe 1 and the connecting rib 5, the first connection hole 131 and the second connection hole 132 can be heated first, and then the first connecting section 51 and the third connecting section 53 are inserted. After the first connection hole 131 and the second connection hole 132 are cooled, the first connecting section 51 and the third connecting section 53 can be fixed firmly and reliably.

[0048] The connecting bars 5 can be formed by bending steel bars with appropriate diameters to form a first connecting section 51, a second connecting section 52, and a third connecting section 53. The third connecting section 53 is preferably welded to the steel reinforcement cage 2, and various fasteners can also be used for connection. There can be multiple connecting bars 5 arranged circumferentially along the corrugated pipe 1 to improve the connection strength between the corrugated pipe 1 and the steel reinforcement cage 2.

[0049] In this embodiment, only the third connecting section 53 of the connecting bar 5 is connected to the steel reinforcement cage 2. The first connecting section 51 can have a shorter length, and it only needs to be able to hook in the first connecting hole 131. Of course, in other embodiments, the length of the first connecting section 51 can also be increased, and the length of the first connecting section 51 can be increased and connected to the steel reinforcement cage 2.

[0050] Both the upper and lower ends of the corrugated pipe 1 can be connected to the steel reinforcement cage 2 through the connecting bars 5. After the connecting bar 5 at the top of the corrugated pipe 1 is installed on the corrugated pipe 1, the spiral outer belt 4 is installed on the outside of the corrugated pipe 1, and the second connecting section 52 of the connecting bar 5 at the top of the corrugated pipe 1 is located between the corrugated pipe 1 and the spiral outer belt 4. When pouring continues, the concrete entering the spiral outer belt 4 can cover the second connecting section 52 to protect the second connecting section 52.

[0051] The steel reinforcement cage 2 includes a plurality of main bars 21, a plurality of longitudinal bars 22, and stirrups 23. The main bars 21 are circular rings, and the plurality of main bars 21 are arranged at intervals along the axial direction of the main bars 21. Each longitudinal bar 22 is arranged along the axial direction of the main bars 21, and the plurality of longitudinal bars 22 are fixedly arranged around the outside of the main bars 21. The stirrups 23 are fixed on the outside of the plurality of longitudinal bars 22 along the circumferential direction of the main bars 21. The corrugated pipe 1 is located outside the stirrups 23 and is connected to the main bars 21 or the longitudinal bars 22. By connecting the corrugated pipe 1 to the main bars 21 or the longitudinal bars 22, the connection strength between the corrugated pipe 1 and the steel reinforcement cage 2 can be ensured, and the connection can be achieved by welding.

[0052] The cast-in-place concrete pile provided by the present utility model can be constructed by the following steps.

[0053] Step S100, conduct a survey on the location of the cast-in-place concrete pile, and record the number, location, and height of the karst caves.

[0054] Step S200, fabricate the structure frame of the cast-in-place pile. In this step, it specifically includes the following steps.

[0055] Step S201, first fabricate the steel reinforcement cage according to the height of the cast-in-place concrete pile.

[0056] Step S202. Then, according to the number, height, and position of the karst caves, determine the number, length of the corrugated pipes, and the position of the corrugated pipes on the steel reinforcement cage. Cut the raw material of the corrugated pipes to form corrugated pipes with appropriate lengths, put the corrugated pipes on the steel reinforcement cage, and connect the two. Specifically, holes can be drilled in the corrugated pipes to form the first connection holes and the second connection holes, and the corrugated pipes are connected to the steel reinforcement cage by connecting bars.

[0057] Step S203. Fix the spiral outer belt at the top of the corrugated pipe. Here, the spiral outer belt can be made of the remaining corrugated pipe material after cutting.

[0058] Step S300. Drill a hole to form a pile hole, and the pile hole passes through the karst cave. After drilling, hole cleaning can be carried out.

[0059] Step S400. Lower the cast-in-place pile structure frame; the steel reinforcement cage is located in the pile hole, the position of the corrugated pipe corresponds to that of the karst cave, and both ends of the corrugated pipe protrude from the top surface and the bottom surface of the corresponding karst cave respectively. After lowering the cast-in-place pile structure frame, hole cleaning can be carried out again.

[0060] Step S400. Pour underwater concrete.

[0061] During the pouring process, pour concrete into the corrugated pipe. First, make the concrete inside the corrugated pipe exceed the top of the corrugated pipe, so that the concrete overflows onto the spiral outer belt, and the concrete on the spiral outer belt does not reach the top end of the spiral outer belt. Only one layer of concrete is retained on the spiral outer belt. After this layer of concrete solidifies, pour concrete again so that the concrete at the spiral outer belt (i.e., outside the corrugated pipe) exceeds the top of the corrugated pipe. In this way, the concrete can be better retained at the spiral outer belt, effectively filling the gap between the top end of the corrugated pipe and the pile hole, and preventing the concrete from entering the karst cave.

[0062] Through the above steps, a cast-in-place concrete pile can be prepared.

[0063] In summary, although the present utility model has been disclosed above with preferred embodiments, the above preferred embodiments are not intended to limit the present utility model. Those of ordinary skill in the art can make various changes and refinements without departing from the spirit and scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the scope defined by the claims.

Claims

1. A cast-in-place pile structure frame for karst areas, where there are pile holes passing through karst caves in the karst areas, and it is characterized in that, The cast-in-place pile structure frame includes a steel reinforcement cage and a corrugated pipe. The steel reinforcement cage is used to be arranged in the pile hole. The corrugated pipe is sleeved outside the steel reinforcement cage and the two are connected. The corrugated pipe is made of plastic, and its pipe wall is in an alternating concave-convex structure along the axial direction. The corrugated pipe is located at the position corresponding to the karst cave on the steel reinforcement cage, and both ends of the corrugated pipe protrude out of the karst cave.

2. The cast-in-place pile structure frame for karst areas according to claim 1, wherein The length of the corrugated pipe is equal to or greater than the sum of the height of the karst cave and twice the diameter of the pile hole.

3. The cast-in-place pile structure frame for karst areas according to claim 1, wherein The size that the top end of the corrugated pipe protrudes upward out of the karst cave is greater than or equal to the diameter of the pile hole. The size that the bottom end of the corrugated pipe protrudes downward out of the karst cave is greater than or equal to the diameter of the pile hole.

4. The cast-in-place pile structure frame for karst areas according to claim 1, characterized in that, The alternating concave-convex structure of the corrugated pipe includes a first concave part and a first convex part. The first convex part protrudes outward relative to the first concave part. Both the first concave part and the first convex part are in a spiral shape around the axial direction of the corrugated pipe and are alternately connected.

5. The cast-in-place pile structure frame for karst areas according to claim 4, characterized in that, The outer diameter of the corrugated pipe is smaller than the diameter of the pile hole. A spiral outer belt is arranged outside the top end of the corrugated pipe. The spiral outer belt is made of plastic, is in a spiral shape, and the number of spiral turns is more than 1.5 turns, and it extends along the spiral direction of the first concave part and the first convex part. The lower side of the spiral outer belt is fixedly connected to the first convex part, and the upper side protrudes outward from the first convex part and is correspondingly arranged with the first concave part in the radial direction.

6. The cast-in-place pile structure frame for karst areas according to claim 5, wherein The spiral outer belt includes a second concave part and a second convex part. The second concave part is connected in parallel to the lower side of the second convex part, and the lower side of the second concave part is fixedly connected to the first convex part. The cross section of the second convex part protrudes outward from the second concave part in a convex arc shape and is arranged at an interval from the first concave part. Or, The spiral outer belt is in a straight shape with the upper side inclined outward.

7. The cast-in-place pile structure frame for karst areas according to claim 5, characterized in that, The cross section of the first convex part is in a convex arc shape protruding outward from the pipe, and the lower side of the spiral outer belt is connected to the lower side of the first convex part.

8. The cast-in-place pile structure frame for karst areas according to claim 4, characterized in that, First connection holes and second connection holes are arranged at the lower side edge of the first convex part. The corrugated pipe is fixedly connected to the steel reinforcement cage through connecting ribs. The connecting ribs include a first connecting section, a second connecting section and a third connecting section. The first connecting section passes through the first connection hole. The second connecting section is located outside the corrugated pipe and extends along the lower side edge of the first convex part. One end of the second connecting section is connected to the first connecting section. The third connecting section passes through the second connection hole, one end of which is connected to the other end of the second connecting section and the other end is fixedly connected to the steel reinforcement cage.

9. The cast-in-place pile structure frame for karst areas according to any one of claims 1-8, characterized in that, Both axial ends of the corrugated pipe are connected to the steel reinforcement cage.

10. A cast-in-place concrete pile, characterized in that, It includes the cast-in-place pile structure frame for karst areas according to any one of claims 1-9. The cast-in-place pile structure frame is arranged in a pile hole, and concrete is poured in the pile hole.

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