Secondary-breaking-free construction device for pile head of cast-in-place pile

Abstract

The utility model belongs to the technical field of construction devices, and particularly relates to a secondary-breaking-free construction device for a pile head of a cast-in-place pile, which comprises a steel casing and an over-filling barrel, the over-filling barrel is connected with the steel casing in an inserted manner, a fixing rod is hinged on the over-filling barrel, and the fixing rod is a telescopic rod; a fixing disc is fixed on the steel casing, a fixing nail is inserted into the fixing disc, and a corresponding waist-shaped hole is formed in the fixing disc; a supporting base plate is hinged to the fixing disc, an opening groove matched with the kidney-shaped hole is formed in the supporting base plate, and the lower surface of the nail head of the fixing nail can make contact with the upper surface of the supporting base plate. By the adoption of the split structure, the upper overfilling barrel can be recycled in time so that the lower filling pile can be poured for standby application.

Description

Technical Field

[0001] The utility model belongs to the technical field of construction devices, and in particular relates to a construction device for a cast-in-place pile head free from secondary breaking. Background Art

[0002] With the development of construction technology, bored pile foundation is widely used as the most common foundation form of high-rise buildings. The "Construction Quality Acceptance Code for Building Foundation Engineering" stipulates that the top of the bored pile should be at least 500mm-1000mm higher than the design elevation. The traditional bored pile construction steps are: earth excavation (excavation elevation is the design elevation + 1000mm) → drilling → installation of steel cage → concrete pouring → concrete strength increase → soil excavation between piles (excavation elevation is the design elevation + 150mm) → manual bottom cleaning to the design elevation → pile head breaking → pile head hoisting and transportation → foundation construction. During this construction process, when the soil between piles is excavated, due to the small spacing between piles, the excavator consumes a lot of mechanical shifts to dig the soil. When the excavator touches the pile body (plain pile) during the excavation process, the bored pile often breaks, causing quality accidents, and the subsequent pile head breaking and hoisting require a lot of manpower and material resources. The pile head is treated as construction waste and transported out, resulting in a great waste of resources, greatly increasing the project cost and delaying the construction period.

[0003] To this end, an invention patent application with patent application number 202211319549.8 discloses a bored pile construction auxiliary device and construction method that does not require the pile head to be broken. During construction, the over-filled concrete and the soil, sewage and other debris in the pile can flow directly to the concrete recovery bucket through the grooves on the special steel casing, without forming a pile head that needs to be broken. The pile foundation is formed in one step, and the pile head breaking process is omitted while ensuring the quality of the pile foundation pouring, greatly improving the construction efficiency. However, its special steel casing needs to be excavated and buried in the surface soil after the pile foundation is positioned for fixing. It needs to wait until the concrete is finally set before it can be recycled, that is, it can no longer be used for pouring the next bored pile. Utility Model Content

[0004] In view of the above technical problems, the utility model provides a construction device for a bored pile head that does not require secondary breaking. The device is composed of two parts, which is easy to rotate and convenient to install and disassemble.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0006] A construction device for a bored pile head that avoids secondary breaking comprises a steel casing and an over-filling barrel, wherein the over-filling barrel is plugged into the steel casing, a fixing rod is hinged on the over-filling barrel, and the fixing rod is a telescopic rod; a fixing plate is fixed on the steel casing, a fixing nail is plugged into the fixing plate, and a corresponding waist-shaped hole is provided on the fixing plate; a supporting pad is hinged on the fixing plate, and an open groove matching the waist-shaped hole is provided on the supporting pad, and the lower surface of the nail head of the fixing nail can contact the upper surface of the supporting pad.

[0007] A limiting plate is fixed on the bottom of the super-filling barrel, and a limiting groove connected with the limiting plate is provided on the supporting pad.

[0008] A raised striking portion is provided at one end of the supporting pad.

[0009] The fixing rod comprises an outer tube and an insertion rod, the outer tube is slidably connected to the insertion rod, a compression spring is arranged between the outer tube and the insertion rod, one end of the outer tube is threadedly connected to a plugging cover; the upper end of the outer tube is hinged to the super filling barrel.

[0010] The lower end of the insertion rod is conical.

[0011] The lower part of the inserting rod is fixedly connected with a push rod.

[0012] Four fixing rods are hinged on the super filling barrel.

[0013] The fixing plate is provided with four fixing nails.

[0014] The lower surface of the super filling barrel contacts the upper surface of the fixing plate.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] The steel casing is fixed to the ground with fixing nails to ensure that it does not move. After the steel casing is fixed, the super filling bucket is installed. The super filling bucket is fixed to the ground with a retractable rod to ensure that it does not move. After the floating slurry is pumped out, the super filling bucket can be recovered and the next root cast-in-place pile can be cast for standby. After the concrete is finally set, the steel casing is recovered. With the above-mentioned split structural setting, the upper super filling bucket can be recovered in time to facilitate the casting of the next root cast-in-place pile.

[0017] The structural setting of the limit plate and the fixing rod can facilitate the installation and disassembly of the overfilling barrel; the fixing nail method is adopted in combination with the supporting pad, and the supporting pad can be knocked during disassembly so that the fixing nail has a certain activity space, which is conducive to its removal. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 yes Figure 1A partial enlarged view of the middle A;

[0020] Figure 3 It is the front view of the utility model;

[0021] Figure 4 It is a structural schematic diagram of the steel casing of the utility model in one direction;

[0022] Figure 5 It is a structural schematic diagram of the steel casing of the utility model in another direction;

[0023] Figure 6 It is a structural schematic diagram of the mounting hole of the utility model;

[0024] Figure 7 This is a schematic diagram of the structure of the super filling barrel of the utility model;

[0025] Figure 8 It is a cross-sectional view of the fixing rod of the utility model;

[0026] Fig. 9 It is a schematic diagram of the use state of the utility model;

[0027] Among them: 1 is a steel casing, 2 is an over-filling barrel, 3 is a fixing rod, 4 is a fixing plate, 5 is a fixing nail, 50 is a nail head, 6 is a waist-shaped hole, 60 is a mounting hole, 7 is a supporting pad, 8 is an opening groove, 9 is a limiting plate, 10 is a limiting groove, 11 is a knocking part, 12 is an outer tube, 13 is an inserting rod, 14 is a plugging cover, 15 is a compression spring, 16 is a push rod, 17 is a concrete pump, and 18 is a floating slurry storage tank. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present utility model are described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0029] like Figure 1-9 As shown, a construction device for a bored pile head that does not require secondary breaking includes a steel casing 1 and a super-filling barrel 2. The super-filling barrel 2 is plugged into the steel casing 1. A fixing rod 3 is hinged on the super-filling barrel 2. The fixing rod 3 is a telescopic rod.

[0030] A fixing plate 4 is fixed on the steel casing 1, a fixing nail 5 is inserted on the fixing plate 4, and a corresponding waist-shaped hole 6 is provided on the fixing plate 4; a supporting pad 7 is hinged on the fixing plate 4, and an opening groove 8 matching the waist-shaped hole 6 is provided on the supporting pad 7.

[0031] The installation process of the steel casing 1 is as follows: first place it at the position to be poured; then push the support plate 7 so that the support plate 7 covers the waist-shaped hole 6, and the open groove 8 on the support plate 7 and one side of the waist-shaped hole 6 form a mounting hole 60 for the fixing nail 5; finally, put the fixing nail 5 into the mounting hole 60, knock the fixing nail 5, insert the fixing nail 5 into the ground (foundation soil), and make the lower surface of the nail head of the fixing nail 5 contact with the upper surface of the support plate 7, and press the support plate 7.

[0032] The disassembly process of the steel casing 1 is as follows: by knocking the support plate 7, the support plate 7 is rotated in the opposite direction, the lower surface of the nail head of the fixing nail 5 does not contact the upper surface of the support plate 7, and the support plate 7 reduces the shielding range of the waist-shaped hole 6, so that the fixing nail 5 has a certain activity space. Finally, the fixing nail 5 can be loosened by shaking it back and forth (in the waist-shaped hole 6) to facilitate its removal.

[0033] The installation process of the super filling barrel 2 is as follows: after the steel casing 1 is installed, the super filling barrel 2 is inserted into the steel casing 1 by hoisting or manual means, and then the end of the fixing rod 3 is inserted into the ground for fixing.

[0034] The disassembly process of the super filling barrel 2 is as follows: the end of the fixing rod 3 is pulled out from the ground, and then the super filling barrel 2 is suspended or manually lifted to be removed.

[0035] Specifically, the specific process of using this device for construction is as follows:

[0036] Excavation (excavation elevation is the design elevation + 150mm) and pile position layout → drilling → steel cage manufacturing and installation → concrete pouring → steel casing 1, super filling bucket 2 installation (installed when concrete pouring reaches the last 2 meters) → floating slurry drainage → recovery of super filling bucket 2, pile head finishing → recovery of steel casing 1 (when concrete reaches final setting)

[0037] (1) Earth excavation (excavation elevation is the design elevation + 150mm) and pile position layout: Before construction, the site will be excavated, leveled and positioned by an excavator, and 150mm thick foundation soil will be reserved for manual leveling. The site flatness is ≤±50mm to ensure that the pile foundation machinery can travel and position smoothly. The site must be leveled and compacted before on-site layout to ensure that the pile foundation machinery can travel and position smoothly and accurately. According to the coordinate control points given by the construction unit, a total station is used to carry out pile position layout and elevation measurement, and RTK is used for re-measurement and the error is controlled within 5mm.

[0038] (2) Drilling: ① Use a rotary drilling machine to drill holes. Drilling begins after the pile driver is in place, and the excavated soil in the hole is promptly shipped to the designated location. ② During the drilling process, the lifting speed of the drill rod must be controlled to prevent the hole wall from collapsing. ③ Bored piles with a pile center distance less than 3 times the pile diameter should be drilled in a skip-driving manner to ensure that the newly constructed bored piles do not affect the quality of the existing bored piles.

[0039] (3) Fabrication and installation of steel cage: The fabrication of steel cage is strictly in accordance with the design. The main reinforcement position is controlled by steel positioning brackets to divide the distance equally. The allowable deviation of the main reinforcement spacing is ±10mm; the allowable deviation of the stirrup or spiral reinforcement pitch is ±20mm; the allowable deviation of the steel cage diameter is ±10mm; the allowable deviation of the steel cage length is ±50mm. A stiffening hoop is added every 2m to strengthen the strength of the steel cage. The length of the steel cage is determined by the depth of the hole. The longitudinal steel bar welding adopts single-sided lap welding, and the lap length is ≥10d. The joints are staggered by no less than 35d. The number of joints in the same section is ≤50%. When transporting and hoisting the steel cage, deformation should be prevented; before placement, the hole should be checked again to ensure that there is no collapse and sediment in the hole; the placement should be aligned with the hole position, supported steadily, slowly and straightly to avoid collision with the hole wall. Pier cage and twist cage are strictly prohibited.

[0040] (4) Concrete pouring: ① Before pouring concrete, the hole should be cleaned. The hole wall and bottom must be cleaned, and there should be no scum at the bottom of the hole and no looseness on the hole wall. ② When there is groundwater but the amount of seepage is not large, the water in the hole should be pumped out and concrete should be poured using the conduit method. The end of the conduit should not be more than 1.5m away from the bottom of the hole; the concrete should be vibrated with an inserted vibrator, and vibrated once every 1.5m of pouring. Concrete should be poured and vibrated continuously to make it dense, and the filling coefficient should be greater than 1.

[0041] (5) Installation of steel casing 1 and super filling barrel 2: When the concrete surface of the pile body is 2 meters away from the pile top, install the steel casing 1. The steel casing 1 is firmly fixed to the ground with fixing nails 5 to ensure that it does not move. After the steel casing 1 is fixed, install the super filling barrel 2. The super filling barrel 2 is firmly fixed to the ground with fixing rods 3 (retractable) to ensure that it does not move.

[0042] (6) Float slurry drainage: After installing the steel casing 1 and the super-filling barrel 2, pour the pile body concrete normally. When the slurry height in the steel casing 1 and the super-filling barrel 2 reaches the quality requirements, stop pouring the pile body concrete, and use a concrete pump to pump the slurry concrete into the slurry storage tank. When pumping the slurry, control the pumping height, that is, the concrete elevation of the pile top. Specifically: The slurry in the slurry storage tank can be reused as needed, such as for temporary projects; it can also be pumped out by setting up a concrete pump.

[0043] (7) Recover the overfilled barrel 2 and finish the pile head: After the floating slurry is drained, recover the overfilled barrel 2 and prepare for the next cast-in-place pile. Manually level and roughen the concrete surface of the pile head.

[0044] (8) Recovering the steel casing 1: After the concrete is poured, the steel casing 1 will not be recovered before final setting. The steel casing 1 is 150 mm above the ground, which can effectively prevent the foundation soil from entering the pile hole. After the concrete is finally set, the steel casing 1 is recovered, cleaned and kept for use.

[0045] Furthermore, in order to connect the super-filling barrel 2 with the steel casing 1, a limit plate 9 is fixed at the bottom of the super-filling barrel 2, and a limit groove 10 connected to the limit plate 9 is provided on the support pad 7, and the limit plate 9 can extend into the limit groove 10. When the super-filling barrel 2 is inserted into the steel casing 1, the limit plate 9 on the super-filling barrel 2 can be inserted into the limit groove 10 by rotating the super-filling barrel 2; the axial movement of the super-filling barrel 2 can be limited by the cooperation of the limit plate 9 and the limit groove 10, and its rotation can be limited by the fixing rod 3, so as to effectively fix the position of the super-filling barrel 2. Specifically: after the two are plugged in, the lower surface of the super-filling barrel 2 contacts the upper surface of the fixing plate 4, that is, the super-filling barrel 2 can be supported by the fixing plate 4.

[0046] The disassembly process of the super filling barrel 2 is as follows: the end of the fixing rod 3 is pulled out from the ground, and then the super filling barrel 2 is rotated in the opposite direction to move the limiting plate 9 out of the limiting groove 10, and then the super filling barrel 2 is suspended or manually lifted to be removed.

[0047] Furthermore, in order to facilitate knocking, a raised knocking portion 11 is provided at one end of the support pad 7 .

[0048] Furthermore, the fixing rod 3 includes an outer tube 12 and an insertion rod 13, the outer tube 12 and the insertion rod 13 are slidably connected, a compression spring 15 is provided between the outer tube 12 and the insertion rod 13, the compression spring 15 is located inside the outer tube 12, and a plug cover 14 is threadedly connected to one end of the outer tube 12; the two ends of the compression spring 15 are respectively against the plug cover 14 and one end of the insertion rod 13. The lower end of the outer tube 12 is provided with a constriction structure, and one end of the insertion rod 13 is provided with a corresponding protrusion, which can prevent the insertion rod 13 from moving out by contacting the protrusion with the constriction structure. The upper end of the outer tube 12 is hinged to the super filling barrel 2.

[0049] After the super filling barrel 2 is inserted, the insertion rod 13 is first pushed upward to compress the compression spring 15, and then the fixing rod 3 is pushed toward the super filling barrel 2 to reduce the angle between the fixing rod 3 and the super filling barrel 2; then the external force is removed, and under the action of the elastic potential energy released by the compression spring 15, the lower end of the insertion rod 13 is inserted into the ground (shallowly); finally, the insertion rod 13 is pulled down to make it deeper into the ground.

[0050] Furthermore, in order to facilitate insertion into the ground, the lower end of the insertion rod 13 is conical.

[0051] Furthermore, in order to facilitate pulling out from the ground, a push rod 16 is fixedly connected to the lower part of the insertion rod 13, and the push rod 16 can be held for operation.

[0052] Further, the number of the fixing rods 3 can be set according to actual conditions, and preferably four fixing rods 3 are hinged on the super filling barrel 2. Similarly, four fixing nails 5 are preferably provided on the fixing plate 4.

[0053] Only the preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the above embodiments.

Claims

1. A construction device for a bored pile head without secondary breaking, characterized in that: The invention comprises a steel casing (1) and an overfilling barrel (2), wherein the overfilling barrel (2) is plugged into the steel casing (1), and a fixing rod (3) is hingedly connected to the overfilling barrel (2), wherein the fixing rod (3) is a telescopic rod; a fixing plate (4) is fixedly connected to the steel casing (1), a fixing nail (5) is plugged into the fixing plate (4), and a corresponding waist-shaped hole (6) is provided on the fixing plate (4); a supporting pad (7) is hingedly connected to the fixing plate (4), and an opening groove (8) is provided on the supporting pad (7) that matches the waist-shaped hole (6), and the lower surface of the nail head of the fixing nail (5) can contact the upper surface of the supporting pad (7).

2. A construction device for avoiding secondary removal of the cast-in-place pile head according to claim 1, characterized in that: A limiting plate (9) is fixed to the bottom of the super filling barrel (2), and a limiting groove (10) connected to the limiting plate (9) is provided on the supporting pad (7).

3. A construction device for avoiding secondary removal of the pile head of a bored pile according to claim 1, characterized in that: A protruding striking portion (11) is provided at one end of the supporting pad (7).

4. The construction device for avoiding secondary breaking of the pile head of a bored pile according to claim 1, characterized in that: The fixing rod (3) comprises an outer cylinder (12) and an insertion rod (13), the outer cylinder (12) and the insertion rod (13) being slidably connected, a compression spring (15) being provided between the outer cylinder (12) and the insertion rod (13), one end of the outer cylinder (12) being threadedly connected to a plugging cover (14); the upper end of the outer cylinder (12) is hingedly connected to the super filling barrel (2).

5. A construction device for avoiding secondary breaking of the cast-in-place pile head according to claim 4, characterized in that: The lower end of the insertion rod (13) is conical.

6. A construction device for avoiding secondary removal of the cast-in-place pile head according to claim 4 or 5, characterized in that: A push rod (16) is fixedly connected to the lower portion of the insertion rod (13).

7. The construction device for avoiding secondary breaking of the pile head of a bored pile according to claim 1, characterized in that: Four fixing rods (3) are hingedly connected to the super filling barrel (2).

8. The construction device for avoiding secondary breaking of the pile head of a bored pile according to claim 1, characterized in that: Four fixing nails (5) are provided on the fixing plate (4).

9. The construction device for avoiding secondary breaking of the pile head of a bored pile according to claim 1, characterized in that: The lower surface of the super-filling barrel (2) contacts the upper surface of the fixed plate (4).

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