A large diameter cast-in-place pile broken pile reinforcement structure and reinforcement method thereof

Abstract

The invention discloses a large-diameter cast-in-place broken pile reinforcement structure and a reinforcement method thereof. The reinforcement structure comprises: a broken pile body, a positioning ring, a bolt, and a steel frame; the positioning rings are arranged at both ends of the steel frame; there are a plurality of bolts, which are arranged at intervals on both sides of the steel frame; a drill hole is opened on the broken pile, and the drill hole passes through the broken part of the broken pile; the steel frame is fixed in the drill hole through the positioning ring, and the lower end of the steel frame is 100 mm away from the bottom of the drill hole; the two ends of the steel frame are at least 500 mm longer than the upper and lower parts of the broken part; the reinforcement method using the reinforcement structure has four steps in total, and when implemented, it is not limited by time, does not need to be excavated twice, and saves a lot of time; does not need large equipment to enter the site twice; makes full use of the original cast-in-place piles for implementation, thereby greatly reducing the output of construction waste and saving investment.

Description

Technical Field

[0001] The invention relates to the technical field of broken cast-in-place pile reinforcement, and in particular to a large-diameter broken cast-in-place pile reinforcement structure and a reinforcement method thereof. Background Art

[0002] Bored piles are concealed structures buried in the ground. They are a basic form of force transmission based on the friction between the outer wall of the pile and the surrounding soil or the bearing capacity of the pile tip. At present, bored piles are widely used in highway bridges and other engineering fields due to their strong adaptability, moderate cost, and simple construction. However, since bored piles belong to concealed projects, there are many factors that affect the quality of bored pile construction, such as geological conditions, drilling technology, wall protection, floating of steel cages, preparation and pouring of concrete, etc. If there is any carelessness or improper measures, quality accidents such as loose holes, neck shrinkage, broken piles and scrapping will occur. Broken piles refer to the deterioration of the concrete of the pile body or damage to the cross-sectional area due to the above factors during the pouring of concrete in the bored pile foundation, so that the pile cannot meet the force requirements. It is one of the most serious accidents in pile foundation construction, which not only delays the construction period, but also has an adverse impact on the quality of the entire project.

[0003] The general remedial treatment measures are mainly the following: secondary hole making method, excavation method (open cut method), pile position adjustment method, etc. Among them, the excavation method (open cut method) and the pile position adjustment method have a long construction period and are difficult to construct on site. Especially when there are a large number of broken piles, adjustments must be made from the beginning of the design. When implemented, a large amount of construction waste will be generated, a lot of time will be wasted, and the efficiency is low. The secondary hole making method must be taken when broken piles are found during the concrete pouring stage. In actual projects, broken piles are often found when the pile foundation concrete has solidified and quality inspections are being carried out. At this time, this method cannot be used for treatment. Summary of the invention

[0004] In view of the problems in the prior art, the present invention provides a large-diameter cast-in-place pile broken pile reinforcement structure and a reinforcement method thereof. The method can make full use of the structural performance of the original pile foundation, avoid generating a large amount of construction waste, improve construction efficiency, reduce the waste of manpower and material resources, and directly reinforce the pile foundation where the broken pile accident occurs without breaking or re-excavating, and is not affected by time, site and location of the broken pile.

[0005] To achieve the purpose of the present invention, the present invention adopts the following technical solutions:

[0006] A large-diameter cast-in-place broken pile reinforcement structure comprises: a broken pile body, a positioning ring, a bolt, and a steel frame; the positioning ring is arranged at both ends of the steel frame; there are multiple bolts, which are arranged at intervals on both sides of the steel frame; a drill hole is opened on the broken pile, and the drill hole passes through the broken part of the broken pile; the steel frame is fixed in the drill hole through the positioning ring, and the lower end of the steel frame is 100 mm away from the bottom of the drill hole; the two ends of the steel frame are at least 500 mm longer than the upper and lower parts of the broken part.

[0007] Preferably, the cross-section of the steel frame is I-shaped and is made by assembling and welding steel plates or profiles.

[0008] Preferably, the positioning ring is composed of an outer ring and a bracket clamped on the inner side of the outer ring; the outer ring has a notch; the bracket includes a screw, a bolt, a holder, and a sleeve; there are three screws, which are connected to each other in an A-shape; each screw is provided with a bolt, the ends of the three screws are inserted into three sleeves, and a holder is provided at the rear end of each sleeve; the holder is clamped on the inner side of the outer ring.

[0009] A method for reinforcing a broken large-diameter cast-in-place pile using the above-mentioned reinforcement structure comprises the following steps:

[0010] Step 1: Conduct on-site inspection of the pile body quality of the completed bored piles according to the specifications, determine the number and location of Class III and IV piles, and then use the core drilling method or sonic transmission method to determine the fracture site, range and cause of the fracture site of the bored piles, and conduct a review calculation after the test report is formed;

[0011] Step 2: The structural design personnel shall review the pressure, bending moment and cross-sectional shear force that need to be reinforced after the pile concrete is damaged based on the test report; determine the diameter and depth of the hole drilled at the center of the pile body and the cross-sectional size and length of the steel frame to be configured based on the calculation results;

[0012] Step 3: The construction site selects a concrete drilling machine to drill a hole in the center of the large-diameter cast-in-place pile to the depth required by the design according to the relevant requirements put forward by the designer;

[0013] Step 4: Place the processed steel frame through the positioning ring, and pour high-strength self-compacting concrete or structural grouting material in the hole. After the concrete solidifies, the pile body is reinforced.

[0014] Preferably, in step four, when placing the processed steel frame through the positioning ring, first adjust the bolts on the positioning ring to expand the outer ring of the clamping seat to fix the positioning ring to the inner wall of the drill hole, and then weld the steel frame on the positioning ring. Similarly, fix another positioning ring above the steel frame and weld it to the top of the steel frame after fixation.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1) It can be used regardless of whether the pile concrete has reached the solidification state, without time limit;

[0017] 2) No need for secondary excavation, saving a lot of time;

[0018] 3) There are no restrictions on the construction site. It can be used anywhere where the testing equipment can enter the site, and there is no need for large equipment to enter the site for the second time;

[0019] 4) Make full use of the existing large-diameter concrete piles without breaking them up, thus greatly reducing the output of construction waste and saving investment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a large-diameter cast-in-place pile after broken pile reinforcement according to the present invention;

[0021] Figure 2 yes Figure 1 Structural diagram of the middle positioning ring;

[0022] In the figure: broken pile 1, broken part 2, drill hole 3, positioning ring 4, bolt 5, steel frame 6, outer ring 41, screw 42, bolt 43, holder 44, sleeve 45. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention are described clearly and completely below:

[0024] like Figure 1 As shown, in one embodiment of the present invention, a large-diameter cast-in-place broken pile reinforcement structure comprises: a broken pile 1 body, a positioning ring 4, a bolt 5, and a steel frame 6; the positioning ring 4 is arranged at both ends of the steel frame 6; there are multiple bolts 5, which are arranged at intervals on both sides of the steel frame 6; a bore hole 3 is opened on the broken pile 1, and the bore hole 3 passes through the broken part 2 on the broken pile 1; the steel frame 6 is fixed in the bore hole 3 by the positioning ring 4, and the positioning ring 4 effectively prevents the steel frame 6 from moving in the bore hole 3, so that the steel frame 6 is guaranteed to be in the middle position of the bore hole 3, thereby ensuring the construction quality; the lower end of the steel frame 6 is 100 mm away from the bottom of the bore hole 3; the two ends of the steel frame 6 are at least 500 mm longer than the upper and lower parts of the broken part 2.

[0025] Specifically, the cross section of the steel frame 6 is in an I-shape, has rigidity and bearing capacity, and can be made by assembling and welding steel plates or profiles.

[0026] Specifically, Figure 2As shown, the positioning ring 4 is composed of an outer ring 41 and a bracket clamped on the inner side of the outer ring 41; the outer ring 41 has a notch to realize the expansion function; the bracket includes a screw 42, a bolt 43, a holder 44, and a sleeve 45; there are three screws 42, which are connected to each other in a herringbone shape; each screw 42 is provided with a bolt 43, the ends of the three screws 42 are inserted into three sleeves 45, and a holder 44 is provided at the rear end of each sleeve 45; the holder 44 is clamped on the inner side of the outer ring 41.

[0027] A method for reinforcing a broken large-diameter cast-in-place pile using the above-mentioned reinforcement structure comprises the following steps:

[0028] Step 1: According to the current national standards, all bored piles must undergo on-site inspection of pile body quality after construction is completed (see Article 9.4.5 of the Technical Specifications for Building Pile Foundations JGJ94-2008). The specific implementation methods can include core drilling, low strain, high strain and acoustic wave transmission methods. These inspection methods can be used to evaluate the integrity of the engineering piles. For Class III and IV piles (see Article 3.5.1 of the Technical Specifications for Building Pile Foundation Inspection JGJ106-2014: Class III piles refer to piles with obvious defects that affect the bearing capacity of the pile structure; Class IV piles refer to piles with serious defects), reinforcement treatment is performed;

[0029] After determining the number and location of Class III and IV piles, the core drilling method or the sonic wave transmission method is used to determine the scope and cause of the fracture site 2 and fracture site 2 of the cast-in-place pile, and a test report is formed and provided to the design unit for review and calculation;

[0030] Step 2: The structural design personnel shall review the pressure, bending moment and cross-sectional shear force that need to be reinforced after the pile concrete is damaged based on the test report; determine the diameter and depth of the hole drilled at the center of the pile body and the cross-sectional size and length of the steel frame 6 to be configured based on the calculation results;

[0031] Step 3: The construction site selects a concrete drilling machine to drill a hole in the center of the large-diameter cast-in-place pile to the depth required by the design according to the relevant requirements put forward by the designer;

[0032] Step 4: Place the processed steel frame 6 through the positioning ring 4, and pour high-strength self-compacting concrete or structural grouting material in the hole, and complete the pile reinforcement after the concrete solidifies.

[0033] Specifically, in step four, when placing the processed steel frame 6 through the positioning ring 4, first adjust the bolt 43 on the positioning ring 4 so that the holder 44 supports the outer ring 41 to expand, so as to fix the positioning ring 4 and the inner wall of the borehole 3, and then weld the steel frame 6 on the positioning ring 4, and similarly fix another positioning ring 4 above the steel frame 6, and weld it to the top of the steel frame 6 after fixation.

[0034] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and improved concepts of the present invention within the technical scope disclosed by the present invention, and they should be covered by the protection scope of the present invention.

Claims

1. A large diameter cast-in-place pile broken pile reinforcement structure, characterized by: include: A broken pile body, a positioning ring, a bolt, and a steel frame; the positioning ring is arranged at both ends of the steel frame; there are multiple bolts, which are arranged at intervals on both sides of the steel frame; a drill hole is opened on the broken pile, and the drill hole passes through the broken part of the broken pile; the steel frame is fixed in the drill hole through the positioning ring, and the lower end of the steel frame is 100mm away from the bottom of the drill hole; the two ends of the steel frame are at least 500mm longer than the upper and lower parts of the broken part of the broken pile; the cross-section of the steel frame is in an I-shape, and is made of steel plates or profiles assembled and welded; the positioning ring is composed of an outer ring and a bracket clamped on the inner side of the outer ring; the outer ring has a notch; the bracket includes a screw, a bolt, a clamping seat, and a sleeve; there are three screws, which are connected to each other in an adult shape; each screw is provided with a bolt, and the three screw ends are inserted into three sleeves, and a clamping seat is arranged at the rear end of each sleeve; the clamping seat is clamped on the inner side of the outer ring.

2. The reinforcement method of a large-diameter cast-in-place pile broken pile reinforcement structure according to claim 1, characterized in that: The following steps are involved: Step 1: Conduct on-site inspection of the pile body quality of the completed bored piles according to the specifications, determine the number and location of Class III and IV piles, and then use the core drilling method or sonic transmission method to determine the fracture site, range and cause of the fracture site of the bored piles, and conduct a review calculation after the test report is formed; Step 2: The structural design personnel shall review the pressure, bending moment and cross-sectional shear force that need to be reinforced after the pile concrete is damaged based on the test report; determine the diameter and depth of the hole drilled at the center of the pile body and the cross-sectional size and length of the steel frame to be configured based on the calculation results; Step 3: The construction site selects a concrete drilling machine to drill a hole in the center of the large-diameter cast-in-place pile to the depth required by the design according to the relevant requirements put forward by the designer; Step 4: Place the processed steel frame through the positioning ring, and pour high-strength self-compacting concrete or structural grouting material in the hole. After the concrete solidifies, the pile body is reinforced.

3. The reinforcement method of a large-diameter cast-in-place pile broken pile reinforcement structure according to claim 2, characterized in that: In step 4, when placing the processed steel frame through the positioning ring, first adjust the bolts on the positioning ring to expand the outer ring of the clamping seat to fix the positioning ring and the inner wall of the drill hole, and then weld the steel frame on the positioning ring. Similarly, fix another positioning ring above the steel frame and weld it to the top of the steel frame after fixation.

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