A method for installing a helical concrete pipe in deep foundation engineering

Abstract

The application discloses a kind of installation methods based on spiral concrete conduit in deep foundation pit engineering, it is related to pile in-pouring concrete technical field.Before pouring, the length of required conduit is determined; conduit is sequentially connected by multiple sectional pipes, and inner and outer spiral joints are arranged at upper and lower ends; after the completion of the whole conduit connection, water tightness, pressure bearing property and joint tensile strength test are carried out; after test is qualified, crane hoists conduit into pile hole; during concrete pouring, concrete enters into spiral conduit through hopper; after pouring is completed, each sectional pipe is disassembled and cleaned.The application solves the problem of concrete segregation that easily occurs during concrete pouring of deep foundation pit support pile in existing foundation pit support engineering.

Description

TECHNICAL FIELD

[0001] The application provides a spiral concrete guide pipe installation method in deep foundation pit engineering, and relates to the technical field of pile concrete pouring. BACKGROUND

[0002] Various support pile foundations including cast-in-place piles need to be hoisted with reinforcement cages and constructed with concrete pouring after drilling is completed, and the existing construction process mostly adopts the guide pipe method to pour concrete. When the pile is initially poured, the concrete falls from the slender guide pipe, and the concrete at the bottom of the pile is separated due to the large drop, forming a "virtual tip" and "dry cinder stone", which affects the use function of the support pile, reduces the safety factor of the deep foundation pit engineering, and leaves a great quality and safety hidden danger.

[0003] The deep foundation pit engineering intelligent safety monitoring and quality control system aims to solve the quality and safety hidden danger in the whole process of foundation pit support, and therefore proposes a spiral concrete guide pipe based on deep foundation pit engineering quality and safety control, which is used to solve the problems that are prone to occur when the deep foundation pit support pile falls along the vertical guide pipe during concrete pouring, improve the overall safety factor of the deep foundation pit engineering, and eliminate the quality and safety hidden danger in the bud. SUMMARY

[0004] The spiral concrete guide pipe based on deep foundation pit engineering quality and safety control provided by the application solves the concrete separation problem that is prone to occur in the deep foundation pit support pile during concrete pouring in the existing foundation pit support engineering.

[0005] In order to solve the above technical problems, the inventors have summarized the technical scheme of the application through practice, and the basic idea of the technical scheme of the application is as follows:

[0006] A spiral concrete guide pipe installation method in deep foundation pit engineering, comprising the following steps:

[0007] Step 1. Before pouring concrete, the total length of the guide pipe required for concrete pouring is calculated according to the pile length before the pipe pile is placed.

[0008] Step 2. The guide pipe is connected by multiple segmented pipes, the segmented pipes required are placed on the ground along a straight line according to the total length, the inner spiral joint at the end of the next segment of the guide pipe is sequentially connected with the outer spiral joint of the previous segment of the guide pipe in order, and then the inner spiral joint at the uppermost end of the guide pipe is connected with the outer spiral joint of the hopper, to form a spiral guide pipe with a smooth inner wall.

[0009] Step 3. After the entire guide pipe is connected, the water tightness, pressure bearing capacity and joint tensile strength are tested.

[0010] Step 4, after the test, the connected pipe is lowered into the supporting pile hole by a crane, and the whole device is fixed by cooperating with the hopper support of the hole mouth, preparing for the concrete pouring work;

[0011] Step 5, in the concrete pouring process, the concrete enters the spiral pipe through the hopper, and falls along the inner wall of the pipe in a spiral manner, avoiding the segregation problem caused by the direct falling of the concrete along the vertical pipe, ensuring the pouring quality of the concrete and increasing the safety factor of the whole deep foundation pit project;

[0012] Step 6, after pouring, each segmented pipe is disassembled, cleaned and placed horizontally in the designated area, and connected for use before the next pouring operation.

[0013] In a further technical solution, the top of the outer spiral joint of the hopper is provided with a discharging valve, and the discharging valve is suitable for controlling the discharge of the hopper bottom.

[0014] In a further technical solution, the inner spiral joint includes a pipe sleeve opening and a limiting ring, the limiting ring is installed in the pipe sleeve opening and is fixedly connected; the pipe sleeve opening is provided with an inner thread and is threadedly connected with the outer spiral joint.

[0015] In a further technical solution, the pipe is spiral and is a hard pipe; the inner wall of the pipe is provided with a spiral groove, and the introduced concrete slides along the spiral groove to the bottom of the pipe pile.

[0016] In a further technical solution, the pipe further includes an internally installed built-in pipe, the built-in pipe is consistent with the curvature of the pipe shell of the pipe;

[0017] The built-in pipe is provided with a fixing member, and the fixing member is suitable for fixing the built-in pipe in the pipe.

[0018] In a further technical solution, the fixing member includes a fixing column, one side of the fixing column is fixedly connected with the outer wall of the built-in pipe, and the other side of the fixing column is fixedly connected with the inner wall of the pipe.

[0019] In a further technical solution, a plurality of adjusting openings are arranged in the pipe shell of the pipe, a transverse rod is installed in the built-in pipe, the transverse rod is fixedly installed in the pipe and transversely penetrates the built-in pipe;

[0020] An abutting sleeve is installed outside the built-in pipe, one end of the abutting sleeve is sleeved on the transverse rod, and the adjusting opening is suitable for installing an adjusting rod to adjust the position of the abutting sleeve and move the built-in pipe on the transverse rod.

[0021] In a further technical solution, the abutting sleeve is provided with external threads away from the side of the built-in pipe, the adjusting port comprises an open shell, a threaded cylinder and a protective plate, the connecting bearing is installed in the pipe shell of the guide pipe, the protective plate is detachably installed outside the open shell, the threaded cylinder is fixedly installed in the open shell, and the threaded cylinder is threadedly connected with one end of the abutting sleeve.

[0022] Beneficial effects:

[0023] In the concrete pouring process, the concrete enters the spiral guide pipe through the hopper, spirally falls along the inner wall of the guide pipe, avoids the segregation problem caused by the direct falling of the concrete along the vertical guide pipe, guarantees the pouring quality of the concrete, and increases the safety factor of the whole deep foundation pit project.

[0024] The built-in pipe is arranged, the probability of segregation caused by the direct falling of the concrete to the bottom is reduced, the transverse movement of the abutting sleeve installed in the adjusting port can realize the transverse movement of the abutting, the transverse movement of the built-in pipe is realized, and the stable pouring effect of the concrete is realized. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0026] Figure 1 It is a schematic diagram of the guide pipe of the present application;

[0027] Figure 2 It is a schematic diagram of the spiral guide pipe of the present application;

[0028] Figure 3 It is a schematic diagram of the hopper structure of the present application;

[0029] Figure 4 It is a schematic diagram of the hopper structure of the present application;

[0030] Figure 5 It is a sectional view of the internal screw joint of the present application;

[0031] Figure 6 It is a schematic diagram of the built-in pipe installed in the guide pipe of the present application;

[0032] Figure 7 It is another schematic diagram of the built-in pipe installed in the guide pipe of the present application;

[0033] Figure 8 It is Figure 7 the enlarged view of A of the present application.

[0034] In the figure: 1. Conduit; 2. Internal spiral joint; 3. External spiral joint; 4. Limiting ring; 5. Hopper; 6. Discharge valve; 7. External spiral joint of hopper; 8. Pipe sleeve; 9. Internal pipe; 10. Fixed column; 11. Transverse rod; 12. Abutment sleeve; 14. Threaded barrel; 15. Protective plate. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0036] The application principle of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0037] Example 1

[0038] like Figures 1 to 5 FIG. 1 is an embodiment of the present invention. A method for installing a spiral concrete conduit in a deep foundation pit project comprises the following steps:

[0039] Step 1: Before pouring concrete, calculate the total length of the conduit 1 required for pouring concrete based on the length of the already placed pipe piles before placement;

[0040] Step 2: The conduit 1 is connected in sequence by multiple segmented pipes. The required segmented pipes are placed horizontally on the ground along a straight line according to the total length. The inner spiral joint 2 at the end of the next segment of the conduit 1 is spirally connected to the outer spiral joint 3 of the previous segment of the conduit 1 in sequence. The inner spiral joint 2 at the top end of the conduit 1 is then spirally connected to the outer spiral joint 7 of the hopper to form a spiral conduit 1 with a smooth inner wall.

[0041] Step 3: After the entire conduit 1 is connected, water tightness, pressure bearing capacity and joint tensile strength tests are performed;

[0042] Step 4: After the test is passed, use a crane to lower the connected conduit 1 into the support pile hole, and fix the entire device with the hopper 5 support at the hole mouth, and prepare for concrete pouring;

[0043] Step 5: During the concrete pouring process, the concrete enters the spiral conduit 1 through the hopper 5 and spirally falls along the inner wall of the conduit 1, thereby avoiding the problem of segregation that is easily generated when the concrete falls directly along the vertical conduit 1, ensuring the pouring quality of the concrete and increasing the safety factor of the entire deep foundation pit project;

[0044] Step 6: After pouring is completed, disassemble and clean each segmented pipe, place it horizontally in the designated area, and connect it before the next pouring operation.

[0045] A discharge valve 6 is mounted on the top of the external helical hopper joint 7, which is adapted to control the discharge of material from the bottom of the hopper 5. The internal helical joint 2 comprises a pipe sleeve 8 and a retaining ring 4, which is fixedly mounted within the pipe sleeve 8. The pipe sleeve 8 is internally threaded and threadedly connected to the external helical joint 3. The conduit 1 is a helical, rigid tube. The inner wall of the conduit 1 is provided with a spiral groove, which allows the introduced concrete to slide along the groove to the bottom of the pile.

[0046] Example 2

[0047] like Figure 6 FIG. 1 shows another embodiment of the present invention. Based on Example 1, an internal tube 9 is added to stabilize the contact between the concrete and the inner wall of the conduit 1, preventing the concrete from falling directly to the bottom and causing concrete segregation. The conduit 1 also includes an internally installed internal tube 9, which is consistent with the curvature of the conduit 1 shell.

[0048] The upper and lower ends of the built-in tube 9 are both provided with fixing parts, and the fixing parts are suitable for fixing the built-in tube 9 in the catheter 1.

[0049] The fixing member includes a fixing column 10 , one side of which is fixedly connected to the outer wall of the built-in tube 9 , and the other side of which is fixedly connected to the inner wall of the catheter 1 .

[0050] Example 3

[0051] like Figure 7 and Figure 8 FIG. 1 shows another embodiment of the present invention, based on Example 2, in order to adjust the position of the internal tube 9 for fine adjustment. The tube housing of the catheter 1 is provided with multiple groups; an abutment sleeve 12 is mounted on the outside of the internal tube 9, one end of which is sleeved on the transverse rod 11. The adjustment port is suitable for mounting an adjustment rod to adjust the abutment sleeve 12 to abut and move the position of the internal tube 9 on the transverse rod 11.

[0052] The side of the abutment sleeve 12 away from the internal tube 9 is provided with an external thread. The adjustment port includes an open shell 13, a threaded barrel 14, and a protective plate 15. The connecting bearing 13 is installed in the tube shell of the catheter 1. The protective plate 15 is detachably mounted on the outside of the open shell 13. The threaded barrel 14 is fixedly mounted in the open shell 13 and is threadedly connected to one end of the abutment sleeve 12. Before use, the protective plate 15 located outside the adjustment port is removed. Then, the rod is rotated to drive the abutment sleeve 12 inside the threaded barrel 14 to rotate forward along the transverse rod 11 to abut the internal tube 9.

[0053] It will be obvious to a person skilled in the art that the application is not limited to the details of the above-described exemplary embodiments, but that the application can be implemented in other embodiments without departing from the scope of the application. The embodiments are therefore to be seen as exemplary and in no way restrictive, the scope of the application being defined by the claims below rather than by the above description, and all variations falling within the meaning and range of equivalency of the essential characteristics of the claims are therefore intended to be embraced therein.

[0054] Furthermore, it should be understood that although the description is made according to embodiments, not every embodiment contains only one independent technical solution, and the description is made in this way only for the sake of clarity, and a person skilled in the art should consider the description as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by a person skilled in the art.

Claims

1. A method for installing a helical concrete pile in a deep foundation project, characterized by, It comprises the following steps: Step 1, before pouring concrete, according to the length of the pile before the pipe pile is placed, the total length of the guide pipe (1) required for pouring concrete is calculated; Step 2, the guide pipe (1) is connected by multiple segmented pipes, according to the total length, the required segmented pipes are placed on the ground along a straight line, the inner screw joint (2) at the end of the next segment of the guide pipe (1) is screw connected with the outer screw joint (3) of the last segment of the guide pipe (1) in sequence, and then the inner screw joint (2) at the uppermost end of the guide pipe (1) is screw connected with the outer screw joint (7) of the hopper, forming a spiral guide pipe (1) with smooth inner wall; Step 3, after the whole guide pipe (1) is connected, the water tightness, pressure bearing capacity and joint tensile strength are tested; Step 4, after the test is qualified, the connected guide pipe (1) is lowered into the support pile hole by a crane, and the whole device is fixed with the hopper (5) support at the hole to prepare for the concrete pouring work; The guide pipe (1) further comprises an inner pipe (9) installed inside, and the inner pipe (9) is consistent with the curvature of the pipe shell of the guide pipe (1); A fixing member is installed on the outer side of the inner pipe (9), and the fixing member is suitable for fixing the inner pipe (9) in the guide pipe (1); The fixing member comprises a fixing column (10), one side of the fixing column (10) is fixedly connected with the outer wall of the inner pipe (9), and the other side of the fixing column (10) is fixedly connected with the inner wall of the guide pipe (1); A plurality of adjusting openings are arranged in the pipe shell of the guide pipe (1), the inner pipe (9) is provided with a transverse rod (11), the transverse rod (11) is fixedly installed in the guide pipe (1) and transversely penetrates the inner pipe (9); An abutting sleeve (12) is installed on the outer side of the inner pipe (9), one end of the abutting sleeve (12) is sleeved on the transverse rod (11), and the adjusting opening is suitable for installing an adjusting rod to adjust the position of the abutting sleeve (12) and move the inner pipe (9) on the transverse rod (11); The side of the abutting sleeve (12) away from the inner pipe (9) is provided with external threads, the adjusting opening comprises an open shell (13), a threaded cylinder (14) and a protective plate (15), a connecting bearing is installed in the pipe shell of the guide pipe (1), the protective plate (15) is detachably installed on the outside of the open shell (13), the threaded cylinder (14) is fixedly installed in the open shell (13), and the threaded cylinder (14) is threadedly connected with one end of the abutting sleeve (12); Step 5, during the concrete pouring process, the concrete enters the spiral guide pipe (1) through the hopper (5) and falls along the inner wall of the guide pipe (1), avoiding the segregation problem caused by the direct falling of the concrete along the vertical guide pipe, ensuring the pouring quality of the concrete and increasing the safety factor of the whole deep foundation pit project; Step 6, after the pouring is completed, the segmented pipes are disassembled, cleaned and placed horizontally in the designated area, and are connected and used before the next pouring operation.

2. The method of installing a helical concrete pile according to claim 1, wherein, A discharging valve (6) is installed on the top of the outer screw joint (7) of the hopper, and the discharging valve (6) is suitable for controlling the discharging of the bottom of the hopper (5).

3. The method for installing a spiral concrete conduit in a deep foundation pit project according to claim 2, characterized in that: The inner screw joint (2) comprises a sleeve mouth (8) and a limiting ring (4), the limiting ring (4) is installed in the sleeve mouth (8) and is fixedly connected; the sleeve mouth (8) is provided with an inner thread and is threadedly connected with the outer screw joint (3).

4. The method according to claim 3, wherein the method is characterized by, The conduit (1) is spiral and is a hard pipe; the inner wall of the conduit (1) is provided with a spiral groove, and the introduced concrete is suitable to slide along the spiral groove to the bottom of the pipe pile.

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