A method for inhibiting concrete bleeding at a joint between a column and a pile

Abstract

The application discloses a method for inhibiting concrete overflow at a joint of a column and a pile, and comprises the following steps: S1, drilling a hole and lowering a reinforcing cage; S2, processing a steel pipe; S3, manufacturing an overflow inhibiting device; S4, hoisting and plumb-finding the steel pipe column; and S5, pouring concrete and unfolding the overflow inhibiting device. The application sets a mechanical control overflow inhibiting device at the bottom of the steel pipe column, effectively controls the elevation of the concrete outside the pipe, maintains the pressure difference between the inside and the outside, and ensures that the high-grade non-shrinkage concrete in the pipe can be continuously poured to the top of the column and overflow.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, and in particular to a method for suppressing concrete slurry seepage at the joint of a column and a pile. Background Technology

[0002] With the advancement of urban construction, more and more building projects are developing underground spaces. The reverse construction method, a construction technique suitable for the efficient construction of urban underground spaces, has been gradually promoted. One-pillar-one-column construction, as a key technology in this method, serves as both a support structure and a permanent structure, making quality control paramount. During the construction of one-pillar-one-column, the concrete grade of the engineering piles is generally lower than that of the steel pipe column. During the pouring process, the elevation difference between the concrete inside and outside the steel pipe column needs to be controlled to ensure that the concrete outside the steel pipe is at the top of the pile before losing its fluidity, allowing the concrete inside the steel pipe to continue pouring until overflow. Due to the principle of communicating vessels, when pouring concrete inside the pipe, the concrete surfaces inside and outside the pipe are always on the same plane. Existing construction techniques usually control the concrete outside the steel pipe to be at the top of the pile by backfilling with gravel. However, since the concrete has not completely lost its fluidity at this time, it is difficult to ensure that the pressure inside the steel pipe and the pressure of the gravel outside the steel pipe are balanced to achieve the purpose of controlling the elevation. Alternatively, after pouring to the control elevation, the concrete inside the pipe is poured after the concrete outside the steel pipe begins to lose its fluidity. However, since the state of the concrete inside the hole is not visible, the actual operation requires a high level of experience from the construction personnel. Once the optimal pouring time is missed, it is easy to cause concrete stratification, affecting the construction quality. Currently, there is no systematic quality control method for quality control. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a method for suppressing concrete grouting at the joint of a single column and single pile, comprising:

[0004] S1. Drilling and lowering the steel cage: Select drilling machinery according to the construction conditions to carry out hole-forming operations, control the verticality of the hole to be less than 1 / 600, and after the hole is formed, carry out processes such as sediment detection, hole cleaning, and lowering the steel cage in accordance with specifications and design requirements.

[0005] S2. Steel pipe processing: Rolled steel pipes are selected, and the relevant components on the drawings are welded. A differential pressure control device is added at the concrete control position outside the pipe to effectively control the grouting height.

[0006] S3. Fabrication of a slurry suppression device: The slurry suppression device consists of a movable support frame, an angle limiter, a slurry suppression surface, and a steel wire rope. It can be deployed and effectively control the concrete elevation outside the pipe, maintain the pressure difference between inside and outside, and ensure that high-grade non-shrink concrete inside the pipe can be continuously poured until slurry overflows at the top of the column.

[0007] S4. Steel pipe column hoisting and vertical adjustment: Level the area around the pile hole, hoist the precast foundation and vertical adjustment plate to the hole opening, and complete the leveling and calibration of the vertical adjustment plate. Hoist the steel pipe and lower it into the hole. During the lowering of the steel pipe, take care to protect the wire rope and ensure its integrity during the lowering process. Extend it out of the hole opening, complete the connection between the tool pipe and the steel pipe, and fix the clamp. Finally, complete the verticality adjustment of the steel pipe column.

[0008] S5. Pour concrete and deploy the slurry suppression device: Place the concrete pouring guide pipe inside the steel pipe, and after sending the guide pipe to the bottom elevation of the pile, perform the first pouring. When it is about to be poured to the calculated height, lift the steel wire rope, deploy the slurry suppression device and fix the steel wire rope, and continue to pour high-grade concrete until there is no significant change in the concrete elevation outside the pipe. Then continue to pour concrete until slurry overflows.

[0009] Preferably, in step S3, the movable support frame consists of a set of 8 to 16 A12 steel bars, with a length longer than the width of the annular plane between the pile hole and the steel pipe. The root of the movable support frame is fixed at the grouting height control point of the steel pipe column and can rotate freely vertically. The end is connected to a steel wire rope.

[0010] Preferably, in step S3, the angle limiter is a triangular steel plate, which is welded to the slurry control position of the steel pipe column during steel pipe processing, that is, above the root of the movable support frame, in order to control its rotation angle and limit and fix it.

[0011] Preferably, in step S3, the slurry suppression surface is an annular sheet of galvanized iron that can perfectly fill the space between the pile hole and the steel pipe. That is, the inner diameter is the same as the steel pipe and the outer diameter is the same as the pile diameter. Small holes are punched in the sheet of iron as venting holes after unfolding. During on-site construction, the slurry suppression surface is inserted from the bottom of the steel pipe and connected to the movable support frame with iron wire. By pulling up the steel wire rope, the movable support frame is rotated to the position limited by the angle limiter, the folded slurry suppression surface is fully opened and fixed at the hole opening to keep the slurry suppression surface in the unfolded state.

[0012] Preferably, in step S4, the wire rope is connected to the free end of the reinforcing steel bar of the movable support frame, and its length is sufficient to extend from the grout control surface to the ground. After the steel column is lowered, the movable support frame can be rotated by pulling up the wire rope.

[0013] Preferably, in step S5, underwater pouring of the cast-in-place pile concrete (low-grade concrete) is carried out to 3m below the pile top elevation (with a 2-meter allowance for grouting height), and the guide pipe is continued to be lowered, controlling the lower end of the guide pipe to be below the interface between different grades of concrete, i.e., 5 meters below the pile top elevation; then the pouring of column concrete (high-grade concrete) begins, so that the high-grade concrete completely replaces the low-grade concrete below 5 meters from the pile top elevation, and all the low-grade concrete is above the pile top elevation. At this time, the concrete elevation inside the hole is the control surface for the concrete elevation outside the pipe.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: by using the slurry suppression device, the problem of controlling the pressure difference between the inside and outside of the steel pipe and the difficulty in controlling the elevation of the slurry surface is solved. During the lowering of the steel pipe column, the slurry suppression device is retracted to complete the verticality adjustment. When the bag concrete is about to be poured to the control surface, the slurry suppression surface is unfolded by the wire rope, which effectively stabilizes the control surface and provides a certain pressure to keep the concrete surface outside the pipe at the control surface, so that the concrete inside the pipe can continue to be poured. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0016] Figure 1 This is a flowchart of the workflow of the present invention;

[0017] Figure 2 This is a plan view of the flood suppression device of the present invention;

[0018] Figure 3 This is a cross-sectional schematic diagram of the present invention.

[0019] In the diagram: 101: Wire rope; 102: Angle limiter; 103: Concrete outside the pipe; 104: Conduit; 106: Steel pipe; 107: Movable support frame; 108: Concrete inside the pipe; 109: Slurry suppression surface. Detailed Implementation

[0020] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the embodiments described.

[0021] Reference Figures 1 to 3 The present invention includes the following steps:

[0022] S1. Drilling and lowering the reinforcing cage: Select drilling machinery according to the construction conditions to carry out the drilling operation. In order to ensure the verticality of the hole and the size of the pile, it is advisable to use a long spiral drilling machine for drilling and control the verticality of the hole to be less than 1 / 600. After the hole is completed, carry out the following procedures in accordance with the specifications and design requirements: sediment detection, hole cleaning, and lowering of the reinforcing cage.

[0023] S2. Steel pipe processing: Steel pipe 106 is made by rolling steel pipes from a pipe rolling plant. Welding of relevant components on the drawings is completed. At the control position of concrete 103 outside the pipe, a differential pressure control device is added to effectively control the slurry height.

[0024] S3. Fabrication of a slurry suppression device: The slurry suppression device consists of a movable support frame 107, an angle limiter 102, a slurry suppression surface 109, and a steel wire rope 101. The movable support frame 107 is composed of a set of 8 to 16 A12 steel bars, with a length slightly longer than the annular width of the plane between the pile hole and the steel pipe 106. The base of the movable support frame 107 is fixed at the slurry height control point of the steel pipe column and can rotate freely vertically. The end is connected to the steel wire rope 101. The angle limiter 102 is a small triangular steel plate, and the steel pipe 109... 6. During processing, it is welded to the grout control position of the steel pipe column, that is, above the root of the movable support frame 107, to control its rotation angle and limit and fix it; the grout suppression surface 109 is a ring of galvanized iron sheet that can fill the gap between the pile hole and the steel pipe 106, and small holes are punched in the iron sheet; the movable support frame 107 and the angle limiter 102 are pre-welded during factory processing. During on-site construction, the grout suppression surface 109 is inserted from the bottom of the steel pipe 106 and connected to the movable support frame 107 with iron wire. After the connection is completed, the ring surface is folded up and attached to the steel pipe column.

[0025] S4. Steel pipe column hoisting and vertical adjustment: Level the area around the pile hole, hoist the precast foundation and vertical adjustment plate to the hole opening, and complete the leveling and calibration of the vertical adjustment plate. Hoist the steel pipe 106 and lower it into the hole. During the lowering of the steel pipe 106, take care to protect the wire rope 101 to ensure its integrity during the lowering process and extend it out of the hole opening. Complete the connection between the tool pipe and the steel pipe 106, and fix the clamp. Finally, complete the verticality adjustment of the steel pipe column.

[0026] S5. Pouring Concrete and Deploying the Bleeding Inhibition Device: Place the concrete pouring guide pipe 104 inside the steel pipe 106. The guide pipe 104 must not be directly supported on the top of the steel column. After the guide pipe 104 is sent to the pile bottom elevation, the first batch of concrete is poured. During the pouring process, the elevation of the completed pile concrete surface is measured in a timely manner. When the low-grade pile concrete is poured to 3m below the pile top elevation, the lower end of the guide pipe 104 is controlled to be 2m below the interface between different grade concretes. Then, the high-grade non-shrink concrete is poured, so that the high-grade concrete completely replaces the pile top elevation by 5m. For the following low-grade concrete, calculate and measure the elevation of the concrete outside the pipe (103) before pouring. When the concrete is about to reach the calculated elevation, raise the steel wire rope (101), deploy the slurry suppression device, and fix the steel wire rope (101). Continue pouring high-grade concrete. Since there is a certain pressure difference between the concrete inside and outside the pipe, and the pressure difference gradually increases as the concrete inside the pipe (108) is poured, to ensure the slurry control effect, the pouring rate can be controlled below 0.5 m / min until the elevation of the concrete outside the pipe (103) no longer changes significantly. Then continue pouring concrete until slurry overflows.

[0027] In this invention, during the processing of the steel pipe column, a movable support frame 107 and an angle limiter 102 are pre-welded to the concrete 103 elevation control surface outside the pipe. Before lowering the steel pipe column, a slurry suppression surface 109 is fitted on and fixed to the movable support frame 107 and the wire rope 101. The movable support frame 107 is then folded up and attached to the steel pipe 106. Subsequently, the steel pipe column is lowered and its verticality is adjusted. The pouring volume is calculated. When the concrete surface is about to be poured to the concrete 103 elevation control surface outside the pipe, the wire rope 101 is pulled up and the slurry suppression surface 109 is unfolded. The pouring speed is reduced and the concrete is poured until the concrete 103 outside the pipe below the slurry control surface begins to lose its plasticity. Continuous pouring is maintained until slurry overflows from the borehole. The slurry control elevation is calculated based on the relative positional relationship between the pile head and the steel pipe 106 according to the design. The elevation is determined by replacing the high and low grade concrete.

[0028] The movable support frame 107 of the present invention is composed of a set of 8 to 16 A12 steel bars, specifically selected according to the pile diameter. The length is slightly longer than the circumference of the annular plane between the pile hole and the steel pipe 106. The root of the movable support frame 107 is fixed at the grouting height control point of the steel pipe column and can rotate freely vertically. The end is connected to the wire rope 101.

[0029] The angle limiter 102 of the present invention is a small triangular steel plate. During the processing of the steel pipe 106, it is welded to the slurry control position of the steel pipe column, that is, above the root of the movable support frame 107, in order to control its rotation angle and limit and fix it.

[0030] The grout suppression surface 109 of this invention is an annular sheet of galvanized iron that can perfectly fill the space between the pile hole and the steel pipe 106. The galvanized iron sheet is relatively thin, preferably 0.25mm thick, and needs to maintain a certain degree of plasticity while maintaining flexibility to facilitate processing, folding, and unfolding. At the same time, utilizing the plasticity of the galvanized iron sheet itself, the annular surface and the connected movable support frame 107 can be folded up and fitted to the surface of the steel pipe column without affecting the lowering and adjustment of the steel pipe column. Its inner diameter is the same as that of the steel pipe 106, and its outer diameter is the same as that of the pile. Small holes are punched in the iron sheet as venting holes after unfolding. During on-site construction, the grout suppression surface 109 is inserted from the bottom of the steel pipe 106 and connected to the movable support frame 107 with iron wire. After the concrete 103 outside the steel pipe 106 is about to be poured to the control surface elevation, the grout suppression surface 109 needs to be unfolded. If concrete pouring continues, due to the principle of communicating vessels, there will inevitably be a pressure difference between the inside and outside of the pipe. In order to provide sufficient pressure, the grout suppression surface 109 is made of galvanized iron sheet, and if necessary, it can be reinforced with wire mesh.

[0031] In this invention, the wire rope 101 is connected to the free end of the reinforcing bar of the movable support frame 107, and its length is sufficient to extend from the slurry control surface to the ground. After the steel column is lowered, the movable support frame 107 can be rotated by pulling up the wire rope 101. After the slurry suppression surface 109 is connected to the movable support frame 107, the annular surface is folded up. The galvanized iron sheet is used to shape itself to keep the folded slurry suppression surface 109 and the movable support frame 107 in contact with the steel pipe column. By pulling up the wire rope 101, the movable support frame 107 is rotated to the position limited by the angle limiter 102, the folded slurry suppression surface 109 is fully opened, and it is fixed at the hole to keep the slurry suppression surface 109 in the unfolded state.

[0032] As described above, although the invention has been shown and described with reference to specific preferred embodiments, it should not be construed as limiting the invention itself. Various changes in form and detail may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A method for suppressing concrete grouting at the joint of a single column and single pile, characterized in that, include: S1. Drilling and lowering the steel cage: Select drilling machinery according to the construction conditions to carry out hole-forming operations, control the verticality of the hole to be less than 1 / 600, and after the hole is formed, carry out sediment detection, hole cleaning and lowering of the steel cage in accordance with specifications and design requirements. S2. Steel pipe processing: Rolled steel pipes are selected, and the relevant components on the drawings are welded. A differential pressure control device is added at the concrete control position outside the pipe to effectively control the grouting height. S3. Fabrication of a slurry suppression device: The slurry suppression device consists of a movable support frame, an angle limiter, a slurry suppression surface, and a steel wire rope. It can be deployed and effectively control the concrete elevation outside the pipe, maintain the pressure difference between inside and outside, and ensure that high-grade non-shrink concrete inside the pipe can be continuously poured until slurry overflows at the top of the column. S4. Steel pipe column hoisting and vertical adjustment: Level the area around the pile hole, hoist the precast foundation and vertical adjustment plate to the hole opening, and complete the leveling and calibration of the vertical adjustment plate. Hoist the steel pipe and lower it into the hole. During the lowering of the steel pipe, take care to protect the wire rope and ensure its integrity during the lowering process. Extend it out of the hole opening, complete the connection between the tool pipe and the steel pipe, and fix the clamp. Finally, complete the verticality adjustment of the steel pipe column. S5. Pour concrete and deploy the slurry suppression device: Place the concrete pouring guide pipe inside the steel pipe, and after sending the guide pipe to the bottom elevation of the pile, perform the first pouring. When the concrete is about to reach the calculated elevation, lift the steel wire rope, deploy the slurry suppression device and fix the steel wire rope. Continue to pour high-grade concrete until there is no significant change in the concrete elevation outside the pipe. Then, continue to pour concrete until slurry overflows.

2. The method for suppressing concrete slurry bleeding at a single-column-single-pile joint according to claim 1, characterized in that, In step S3, the movable support frame consists of a set of 8 to 16 A12 steel bars, with a length longer than the width of the annular plane between the pile hole and the steel pipe. The root of the movable support frame is fixed at the grouting height control point of the steel pipe column and can rotate freely vertically. The end is connected to a steel wire rope.

3. The method for suppressing concrete slurry bleeding at a single-column-single-pile joint according to claim 1, characterized in that, In step S3, the angle limiter is a triangular steel plate, which is welded to the slurry control position of the steel pipe column during steel pipe processing, that is, above the root of the movable support frame, in order to control its rotation angle and limit and fix it.

4. The method for suppressing concrete slurry seepage at a single-column-single-pile joint according to claim 3, characterized in that, In step S3, the slurry suppression surface is an annular sheet of galvanized iron that can perfectly fill the space between the pile hole and the steel pipe. That is, the inner diameter is the same as the steel pipe and the outer diameter is the same as the pile diameter. Small holes are punched in the sheet of iron as venting holes after unfolding. During on-site construction, the slurry suppression surface is inserted from the bottom of the steel pipe and connected to the movable support frame with iron wire. By pulling up the steel wire rope, the movable support frame is rotated to the position limited by the angle limiter, the folded slurry suppression surface is fully opened, and it is fixed at the hole opening to keep the slurry suppression surface in the unfolded state.

5. The method for suppressing concrete slurry bleeding at a single-column-single-pile joint according to claim 1, characterized in that, In step S4, the wire rope is connected to the free end of the reinforcing steel bar of the movable support frame, and its length is sufficient to extend from the grout control surface to the ground. After the steel column is lowered, the movable support frame can be rotated by pulling up the wire rope.

6. The method for suppressing concrete slurry bleeding at a single-column-single-pile joint according to claim 1, characterized in that, In step S5, underwater concrete for the cast-in-place pile is poured to 3m below the pile top elevation, while reserving a 2-meter grouting height. The cast-in-place pile concrete is low-grade concrete. The guide pipe is lowered further, and the lower end of the guide pipe is controlled to be below the interface between different grades of concrete, i.e., 5 meters below the pile top elevation. The column concrete is then poured, and the column concrete is high-grade concrete, so that the high-grade concrete completely replaces the low-grade concrete below 5 meters from the pile top elevation. All the low-grade concrete is above the pile top elevation. At this time, the concrete elevation inside the hole is the control surface for the concrete elevation outside the pipe.

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