CN113373926B - Separating device for pile head breaking and construction method - Google Patents

Abstract

The invention provides a separation device for pile head breaking and a construction method, wherein the separation device comprises an outer steel bar ring and an inner steel bar ring, the diameter of the outer steel bar ring is equal to or larger than the outer diameter of a pile foundation steel bar cage, the diameter of the inner steel bar ring is smaller than the inner diameter of the pile foundation steel bar cage, a steel bar net is welded between the inner steel bar ring and the outer steel bar ring, and at least 6 breaking boxes are annularly and equidistantly arranged at the bottom of the outer steel bar ring. The separation device is arranged at the position 5-10cm above the pile top elevation on the reinforcement cage, after pile foundation concrete pouring is completed and the design strength is achieved, concrete outside each breaking box is broken, the breaking boxes are broken and removed to form a hydraulic jack placement groove, ultrathin hydraulic jacks are arranged in the groove, the jacks are controlled to synchronously push upwards, the pile heads are broken along the separation device, and finally the pile heads are integrally lifted away from the pile tops. The invention has simple operation, less equipment and manpower investment, high work efficiency, and the separating device can be recycled and reused, thereby saving the cost.

Description

Separating device for pile head breaking and construction method

Technical Field

The invention belongs to the field of pile foundation construction of bridge engineering, building engineering and hydraulic engineering, and particularly relates to a separation device for pile head breaking and a pile head breaking method.

Background

The underwater concrete filling pile is a conventional foundation structure in the field of civil engineering, and is widely applied to construction in the fields of bridge engineering, building engineering, hydraulic engineering and the like. Because the pile top can have slurry when pouring under water, the pile body is required to be overfilled to ensure the concrete strength of the designed pile body, after the pile body pouring is completed, the pile head overfilled concrete is required to be broken, the main reinforcement is stripped off, and then the pile body is applied to a bearing platform, a tie beam and the like to form an integral stress structure. Pile head breaking is an important procedure in pile foundation construction, and the quality and efficiency of pile head breaking directly influence the development of subsequent work. At present, a pneumatic pick or a hydraulic pile breaker is mainly adopted for pile head breaking, and the pneumatic pick breaking method has low construction efficiency, large dust, large noise and high labor intensity; by adopting the hydraulic pile breaker, the working efficiency can be improved, but the equipment cost is high, and the follow-up cleaning work and auxiliary construction investment are large.

Disclosure of Invention

The invention aims to provide a separating device for pile head breaking and a pile head breaking method aiming at the defects of the existing pile head breaking method, so as to simplify the pile head breaking process, reduce the construction cost and improve the construction efficiency.

The invention provides a separating device for pile head rupture, which is characterized in that: the pile foundation reinforcement cage comprises an outer reinforcement ring and an inner reinforcement ring, the circle centers of the inner reinforcement ring and the outer reinforcement ring are overlapped, the diameter of the outer reinforcement ring is equal to or larger than the outer diameter of the pile foundation reinforcement cage, the diameter of the inner reinforcement ring is smaller than the inner diameter of the pile foundation reinforcement cage, a reinforcement net is welded between the inner reinforcement ring and the outer reinforcement ring, at least 6 breaking boxes are circumferentially distributed at equal intervals on the outer reinforcement ring, the inner reinforcement ring and the reinforcement net, the breaking boxes are made of foamed plastic materials, the top surface and the bottom surface parallel to the reinforcement net are arranged on the breaking boxes, the volume of the breaking boxes can accommodate an ultrathin hydraulic jack, and the breaking boxes are fixedly bound with the outer reinforcement ring.

The construction method for pile head breaking by adopting the separation device for pile head breaking is characterized by comprising the following steps of:

(1) When the pile foundation reinforcement cage is lowered, winding or wrapping the concrete bonding preventing material at the position of each reinforcement of the reinforcement cage above the designed elevation of the pile top; installing a separation device at a position 5-10cm above the pile top elevation on the reinforcement cage, sleeving an outer reinforcement ring on the periphery of the reinforcement cage, positioning an inner reinforcement ring in the reinforcement cage, and binding and fixing the outer reinforcement ring and the reinforcement cage; marking the positions of the breaking boxes on the top of the reinforcement cage opposite to each breaking box;

(2) After pile foundation concrete pouring is completed and the design strength is reached, excavating foundation pit soil around the pile head, finding out the position of each breaking box according to the mark, breaking the concrete outside the breaking boxes, and breaking and removing the breaking boxes to form a hydraulic jack placement groove;

(3) An ultrathin hydraulic jack is arranged in each hydraulic jack placement groove, each jack is controlled to synchronously push upwards, so that the pile head is broken along the inner and outer steel bar rings and the steel bar meshes of the separation device, and the pile head is integrally lifted off the pile top by vertical lifting of lifting equipment.

The separating device can form a pile head fracture surface and a plurality of hydraulic jack placement grooves, when the pile head is broken, the hydraulic jacks synchronously push upwards to fracture pile head concrete along the separating device, so that the pile head is broken integrally.

Drawings

FIG. 1 is a schematic structural view of a separator;

Fig. 2 is a schematic view showing an installation state of the spacer on the pile foundation reinforcement cage.

Detailed Description

As shown in fig. 1, the separating device for pile head breaking provided by the invention comprises an outer steel bar ring 1 and an inner steel bar ring 2, wherein the circle centers of the inner steel bar ring and the outer steel bar ring are coincident, the diameter of the outer steel bar ring is equal to or larger than the outer diameter of a pile foundation steel bar cage, the diameter of the inner steel bar ring is smaller than the inner diameter of the pile foundation steel bar cage, a steel bar net 3 is welded between the inner steel bar ring and the outer steel bar ring, concrete bonding prevention materials are wound or wrapped on steel bars of the outer steel bar ring, the inner steel bar ring and the steel bar net, and the concrete bonding prevention materials can be plastic adhesive tapes, sponges, foam materials and the like; at least 6 breaking boxes 4 are circumferentially and equidistantly arranged at the bottom of the outer steel bar ring, the breaking boxes are made of foam plastic materials, the breaking boxes are provided with top surfaces and bottom surfaces which are parallel to the steel bar meshes, the volume of the breaking boxes can accommodate an ultrathin hydraulic jack, and the breaking boxes 4 are fixedly bound with the outer steel bar ring 1.

When the separation device is used, the separation device is arranged at a position above the pile top elevation on the pile foundation reinforcement cage, and when pile foundation concrete is poured, the concrete guide pipe penetrates through the reinforcement ring to pour concrete into the pile hole. After the concrete pouring is completed, the separating device forms a separating section between the pile top and the pile head, so that the pile head is convenient to break integrally.

In order to improve the separation effect of the separation device, the area of the reinforcing mesh should be increased as much as possible, so that the size of the inner reinforcing ring should be as small as possible on the premise of meeting the requirement of lowering the guide pipe, and the radius of the inner reinforcing ring does not exceed 1/3 of the radius of the outer reinforcing ring when the separation device is implemented.

The breaking box is arranged to form a plurality of spaces capable of placing ultrathin hydraulic jacks on pile head concrete in a circumferential direction, and when the pile head is broken, the pile head concrete is broken along the separating device through the hydraulic jacks. The breaking box is made of foam plastic materials, so that the breaking box is convenient to break and clean in the later period. In specific implementation, the breaking box can be a hollow box body or a solid foam plastic block.

The invention adopts the separation device to break pile heads, and the concrete construction method is as follows:

(1) As shown in fig. 2, when the pile foundation reinforcement cage 5 is lowered, plastic adhesive tapes, sponges, foam materials and other concrete bonding-preventing materials are wound or wrapped at the position of each reinforcement of the reinforcement cage above the designed elevation of the pile top, so that the reinforcement can be separated from the concrete when the pile head is broken; the separation device is arranged at the position 5-10cm above the pile top elevation on the reinforcement cage, the outer reinforcement ring 1 is sleeved on the periphery of the reinforcement cage 5, the inner reinforcement ring 2 is positioned in the reinforcement cage, and the outer reinforcement ring and the reinforcement cage are bound and fixed by plastic ropes or adhesive tapes and other materials which are not easy to bond with concrete;

Because the breaking boxes can be poured in the concrete after the concrete is poured, marks can be arranged on the top of the reinforcement cage opposite to each breaking box 4, so that the position for searching the breaking box can be judged after the concrete is poured;

(2) After pile foundation concrete pouring is completed and the design strength is reached, excavating foundation pit soil around the pile head, finding out the position of each breaking box according to the mark, breaking out the concrete outside the breaking box, breaking and removing the breaking box 4, and forming a hydraulic jack placement groove at the position where the breaking box is installed;

(3) An ultrathin hydraulic jack is arranged in each hydraulic jack arranging groove, and steel backing plates are arranged at the bottom and the top of the jack. As a specific implementation mode, the invention can select an ultrathin hydraulic jack meeting the following performance indexes: the bearing capacity is 5-150 tons, the body height is 32-100 mm, the working stroke is 6-18 mm, and the working pressure is above 70 MPa.

And controlling each hydraulic jack to synchronously push upwards to break the pile head along the inner and outer steel bar rings and the steel bar meshes of the separation device, and then adopting lifting equipment to vertically lift the pile head to integrally lift the pile head away from the pile head so as to finish pile head breaking.

Claims (3)

1. A separator for pile head rupture, characterized by: the pile foundation reinforcement cage comprises an outer reinforcement ring and an inner reinforcement ring, the circle centers of the inner reinforcement ring and the outer reinforcement ring are overlapped, the diameter of the outer reinforcement ring is equal to or larger than the outer diameter of the pile foundation reinforcement cage, the diameter of the inner reinforcement ring is smaller than the inner diameter of the pile foundation reinforcement cage, a reinforcement net is welded between the inner reinforcement ring and the outer reinforcement ring, at least 6 breaking boxes are circumferentially distributed at equal intervals on the outer reinforcement ring, the inner reinforcement ring and the reinforcement net, the breaking boxes are made of foamed plastic materials, the top surface and the bottom surface parallel to the reinforcement net are arranged on the breaking boxes, the volume of the breaking boxes can accommodate an ultrathin hydraulic jack, and the breaking boxes are fixedly bound with the outer reinforcement ring.

2. The separator for pile head rupture according to claim 1, wherein: the radius of the inner steel bar ring is not more than 1/3 of the radius of the outer steel bar ring.

3. A construction method for pile head breaking using the partition device for pile head breaking according to claim 1, comprising the steps of:

(1) When the pile foundation reinforcement cage is lowered, winding or wrapping the concrete bonding preventing material at the position of each reinforcement of the reinforcement cage above the designed elevation of the pile top; installing a separation device at a position 5-10cm above the pile top elevation on the reinforcement cage, sleeving an outer reinforcement ring on the periphery of the reinforcement cage, positioning an inner reinforcement ring in the reinforcement cage, and binding and fixing the outer reinforcement ring and the reinforcement cage; marking the positions of the breaking boxes on the top of the reinforcement cage opposite to each breaking box;

(2) After pile foundation concrete pouring is completed and the design strength is reached, excavating foundation pit soil around the pile head, finding out the position of each breaking box according to the mark, breaking the concrete outside the breaking boxes, and breaking and removing the breaking boxes to form a hydraulic jack placement groove;

(3) An ultrathin hydraulic jack is arranged in each hydraulic jack placement groove, each jack is controlled to synchronously push upwards, so that the pile head is broken along the inner and outer steel bar rings and the steel bar meshes of the separation device, and the pile head is integrally lifted off the pile top by vertical lifting of lifting equipment.