CN-121992781-A - Pile head chiseling device and method for bridge construction

CN121992781ACN 121992781 ACN121992781 ACN 121992781ACN-121992781-A

Abstract

The invention relates to the technical field of pile head construction, and particularly discloses a pile head chiseling device for bridge construction and a method thereof, comprising an annular mounting frame, wherein a plurality of hydraulic push rods are uniformly arranged on the annular mounting frame, the tail ends of the hydraulic push rods are connected with conical crushing heads, a positioning mechanism comprises a plurality of support rods rotatably arranged on the mounting frame, a base rotatably arranged on the support rods, rollers rotatably arranged on the base and a synchronous deflection assembly for synchronously deflecting the support rods, the support rods deflect along the radial direction of the mounting frame, the support rods are in one-to-one correspondence with the hydraulic push rods, detection assemblies for detecting the positions of steel bars in the pile heads are arranged on the support rods, and a motor for driving the base to rotate is arranged on the support rods; the invention has the beneficial effects of avoiding the problem of deformation of the steel bars caused by impact of the crushing head on the steel bars.

Inventors

HE LIANG
YANG QIANCHENG
ZHANG YI
HUANG SHUIHUA
LIU KAIHUANG
Zhu Yizhang
Mo Xiuquan
CHEN ZHIPENG
YANG XINYU
Chen Panyang

Assignees

保利长大工程有限公司

Dates

Publication Date: 20260508
Application Date: 20260410

Claims (10)

1. The pile head chiseling device for bridge construction comprises an annular mounting frame, wherein a plurality of hydraulic pushing rods are uniformly arranged on the annular mounting frame, and the tail ends of the hydraulic pushing rods are connected with conical crushing heads, and the pile head chiseling device is characterized by further comprising: The positioning mechanism comprises a plurality of support rods which are installed on the installation frame in a rotating mode, a base which is installed on the support rods in a rotating mode, idler wheels which are installed on the base in a rotating mode and synchronous deflection assemblies which are used for enabling the support rods to deflect synchronously, the support rods deflect along the radial direction of the installation frame, the support rods are in one-to-one correspondence with the hydraulic push rods, detection assemblies for detecting the positions of steel bars in the pile heads are arranged on the support rods, and a motor for driving the base to rotate is arranged on the support rods.
2. The pile head chiseling device for bridge construction according to claim 1, wherein the mounting frame is provided with a first elastic member, and the first elastic member is used for enabling the upper end of the supporting rod to deflect towards the center direction of the mounting frame in an initial state.
3. The pile head chiseling device for bridge construction according to claim 2, wherein the first elastic member is a torsion spring, and two ends of the torsion spring are respectively connected with the support rod and the mounting frame.
4. The pile head chiseling device for bridge construction according to claim 1, wherein the detecting assembly comprises an eddy current sensor probe, a signal processing unit and a central control unit connected with the signal processing unit, the central control unit is electrically connected with the motor, and when the eddy current sensor probe detects the steel bar, the motor drives the base to deflect, so that the roller advances obliquely downwards along the surface of the pile head.
5. The pile head chiseling apparatus for bridge construction according to claim 4, wherein the eddy current sensor probe is fixedly installed on a side of the support rod facing the pile head, and the sensing surface is closely below the roller.
6. The pile head chiseling apparatus for bridge construction according to claim 1, wherein the roller is rotatably mounted on the base by a rolling bearing.
7. The pile head chiseling device for bridge construction according to claim 1, wherein the synchronous deflection assembly comprises a plurality of radial telescopic connecting rods hinged on the supporting rods, a plurality of radial sliding blocks slidably mounted on the mounting frame along the radial direction of the mounting frame, and a plurality of circumferential telescopic connecting rods for connecting two adjacent radial telescopic connecting rods, wherein the lower ends of the radial telescopic connecting rods are fixedly connected with the radial sliding blocks, and two ends of each circumferential telescopic connecting rod are fixedly connected with the two adjacent radial telescopic connecting rods respectively.
8. The pile head chiseling device for bridge construction according to claim 7, wherein the mounting frame is provided with a plurality of sliding grooves, and the radial sliding blocks are slidably mounted in the sliding grooves along the radial direction of the mounting frame.
9. The pile head chiseling apparatus for bridge construction according to claim 7, wherein the second elastic members are disposed in the radial expansion link and the circumferential expansion link, and in an initial state, the second elastic members are used for shrinking the radial expansion link and the circumferential expansion link to a minimum.
10. A method of chiseling a pile head for bridge construction using the apparatus of any one of claims 1 to 9, comprising the steps of: S1, firstly, sleeving a mounting frame on a pile head, and when the annular mounting frame descends along the pile head, abutting the top end of the pile head with a plurality of rollers on a supporting rod, and synchronously outwards deflecting the supporting rod under the action of a synchronous deflection assembly to enable the rollers to roll downwards along the outer circumferential wall of the pile head; S2, in the process that the annular mounting frame continuously descends, the detection assembly detects the position of the steel bar in the pile head below the current position of the support rod, if the detection assembly detects that the steel bar is aligned with the crushing head, the motor drives the base to deflect, the mounting frame is guided to descend and simultaneously move downwards in a spiral mode, so that the crushing head is driven to be staggered with the steel bar, and when the mounting frame descends to a preset position on the pile head, the hydraulic push rod drives the crushing head to chisel concrete in a non-steel bar area; s3, after the pile head is chiseled, the crushing head keeps a stretching state to bear the pile head, the device is lifted and transported to an unloading area, a plurality of hydraulic push rods retract and reset in the unloading area, and meanwhile, the upper ends of the support rods are driven by torsion springs to deflect towards the circle center, so that the rollers radially squeeze the outer circumferential wall of the pile head, and the pile head and the mounting frame are kept coaxial; s4, when the crushing head is separated from the bottom end of the pile head, the pile head vertically slides off the mounting frame.

Description

Pile head chiseling device and method for bridge construction Technical Field The invention relates to the technical field of pile head construction, in particular to a pile head chiseling device and a pile head chiseling method for bridge construction. Background The pile head in bridge construction refers to an ineffective pile body part which is formed by a floating slurry layer with lower strength, loose concrete and mixed slurry sediments and is formed by exceeding the designed pile head elevation of the top of a pile body after the construction of a bored cast-in-place pile or a precast pile is completed, wherein the formation is mainly characterized in that when the concrete is cast-in-place, in order to ensure that the pile head concrete is compact after a pile casing is pulled out and is effectively connected with fresh concrete at the lower part, the concrete at the upper part contacted with slurry has the quality defects of insufficient strength, slurry clamping, segregation and the like due to the subsidence of aggregate and floating of the floating slurry. The pile head must be chiseled off, the core purpose and necessity of which are throughout the whole process of quality control and structural safety of bridge foundation engineering, firstly, from the stress perspective, the load of the bridge upper structure needs to be uniformly transferred to the pile foundation through the bearing platform or the tie beam, thus the pile head must be exposed from the fresh, solid and non-weak interlayer concrete surface so as to ensure reliable rigid connection between the pile body and the bearing platform, if the weak pile head is not chiseled off thoroughly, the low strength and high compressibility of the pile head will lead to uneven load transfer, local crushing of the pile head, even the settlement or structural instability of the bearing platform; in addition, from the point of view of quality inspection, the exposed pile body concrete after the pile head is chiseled is convenient for direct observation, nondestructive detection or core drilling sampling so as to judge whether the pile body integrity and the actual strength of the concrete meet the design requirements or not, and is a necessary link for engineering acceptance, in addition, the concrete superfilling amount can be effectively controlled by accurately chiseling to the design elevation, material waste is avoided, and a clean and accurate operation reference surface is provided for binding the pile body steel bars of the subsequent bearing platform and supporting templates. Therefore, the pile head chiseling in bridge construction is not a simple breaking operation, but a fine engineering measure aiming at eliminating hidden danger of pile foundation quality, ensuring reliable anchoring of pile tops and bearing platforms, optimizing structural stress performance and meeting quality inspection standards, and is directly related to long-term stability and driving safety of a lower structure of a bridge. The chinese patent document with the bulletin number of CN215629947U discloses a hydraulic pile breaker, which comprises a mounting pedestal and is characterized in that connecting pieces are connected between a plurality of mounting seats, two sides of the connecting pieces are connected with two sides of the mounting seats, one sides of the mounting seats are sleeved with flanges, hydraulic cylinders are mounted in the flanges through bolts, one sides of the hydraulic cylinders penetrate through the mounting seats and are provided with fixing seats and shaft sleeves, one side of each shaft sleeve is movably provided with a drill rod, one end of each drill rod penetrates through the fixing seat and the shaft sleeve and extends to the inside of the hydraulic cylinder, bases are mounted on two sides of the inside of each fixing seat, one side of each base is connected with an electric telescopic rod, one end of each electric telescopic rod is connected with a clamping block, two sides of each drill rod, which are close to the electric telescopic rods, are clamped with the clamping blocks. The top center department of a plurality of mount pads all installs the couple, and the mounting panel is installed at the top of a plurality of mount pads, and couple internal connection has the chain, and the one end of chain runs through the mounting panel to extend to the top, through installing the mounting panel, can improve broken stake machine stability in the removal in-process. The inside of mounting panel transversely installs a plurality of crossbeams, and the inside of mounting panel is vertical installs a plurality of perpendicular roof beams, and the crossbeam is equipped with the screw with the intersection department of perpendicular roof beam, and is equipped with the threaded rod in the screw. The inside of a plurality of mount pads is equipped with the lasso, and the inside equidistance of lasso is equipped with a plurality of atomizer