阅读说明：本技术 一种大直径桩群孔施工的方法及导向装置 (Method for constructing large-diameter pile group holes and guiding device ) 是由 梁森 赖香传 陈锐 马程伦 张强 于 2020-12-07 设计创作，主要内容包括：本发明公开了一种大直径桩群孔施工的方法及导向装置,本发明是利用旋挖机钻杆作为定位基准；将旋挖机钻头卸除,更换为与旋挖机钻头等直径的定位法兰,并沿定位法兰圆周焊接一组垂直管作为群孔的导向管；导向管上部与一对半圆箍固定连接；钻完一组群孔后将旋挖机钻杆旋转一定角度再钻另外一组群孔,直至钻完所有群孔。本发明可以确保群孔施钻过程中定位的准确性和垂直度的有效控制,避免群孔施工过程中发生偏位、废孔,以达到超前破碎岩层完整性,加快大直径桩成孔进度。(The invention discloses a method for constructing a group hole of a large-diameter pile and a guide device, which utilize a drill rod of a rotary drilling machine as a positioning reference; removing the drill bit of the rotary drilling machine, replacing the drill bit with a positioning flange with the same diameter as the drill bit of the rotary drilling machine, and welding a group of vertical pipes along the circumference of the positioning flange to be used as guide pipes of the group holes; the upper part of the guide pipe is fixedly connected with a pair of semicircular hoops; and after one group of holes are drilled, rotating the drill rod of the rotary drilling machine by a certain angle and then drilling the other group of holes until all the group of holes are drilled. The invention can ensure the positioning accuracy and the effective control of the verticality in the group hole drilling process, and avoid the deviation and the waste hole in the group hole construction process, thereby achieving the integrity of the advanced broken rock stratum and accelerating the hole forming progress of the large-diameter pile.)

1. A method for constructing large-diameter pile group holes is characterized by comprising the following steps: the method uses a drill rod of a rotary excavating machine as a positioning reference; removing the drill bit of the rotary drilling machine, replacing the drill bit with a positioning flange with the same diameter as the drill bit of the rotary drilling machine, and welding a group of vertical pipes along the circumference of the positioning flange to be used as guide pipes of the group holes; the upper part of the guide pipe is fixedly connected with a pair of semicircular hoops; and after one group of holes are drilled, rotating the drill rod of the rotary drilling machine by a certain angle and then drilling the other group of holes until all the group of holes are drilled.

2. The method for constructing the large-diameter pile group hole according to claim 1, wherein: the distance between the pair of semi-circular hoops and the positioning flange is 3-5 m; when the guide pipe is fixedly connected with the pair of semicircular hoops, the verticality of the guide pipe is ensured.

3. The method for constructing the large-diameter pile group hole according to claim 1, wherein: a rubber pad is padded between the pair of semi-circular hoops and the rotary excavating machine drill rod to increase the friction force between the semi-circular hoops and the rotary excavating machine drill rod and ensure that no relative movement exists between the semi-circular hoops and the rotary excavating machine drill rod.

4. A guide device for large diameter pile group hole construction according to any one of the claims 1-3, comprising a rotary excavating machine drill rod (1); the method is characterized in that: the bottom end of a drill rod (1) of the rotary drilling machine is fixedly connected with a positioning flange (3) through a group of bolt assemblies (2); a rotary excavating machine drill rod (1) above the positioning flange (3) is fixed by a pair of semi-circular hoops (4); the outer circle of the positioning flange (3) is evenly distributed with a group of guide pipes (5) which are vertically arranged along the circumference, the lower ends of the guide pipes (5) are welded with the positioning flange (3), and the upper ends of the guide pipes (5) are fixedly connected with a pair of semi-circular hoops (4).

5. The guiding device for large-diameter pile group hole construction according to claim 4, is characterized in that: the positioning flange (3) comprises a small ring pipe (6) and a large ring pipe (7), and the small ring pipe (6) and the large ring pipe (7) are welded into an integral structure through a group of uniformly distributed I-shaped steel (8); a flange plate (9) is welded in the small ring pipe (6), a group of reinforcing plates (10) which are uniformly distributed along the circumference are arranged at the bottom of the flange plate (9), and the flange plate (9) is connected with the bottom end of the rotary drilling machine drill rod (1) through a group of bolt assemblies (2); the excircle of the large ring pipe (7) is vertically welded with the guide pipe (5).

6. The guiding device for large-diameter pile group hole construction according to claim 4, is characterized in that: the semicircular hoop (4) comprises a small semicircular pipe (11) and a large semicircular pipe (12), and the small semicircular pipe (11) and the large semicircular pipe (12) are welded into an integral structure through a group of uniformly distributed I-steel (8) and channel steel (13); a connecting hole (14) is arranged on the channel steel (13), and a pair of semi-circular hoops (4) are hooped on the drill rod (1) of the rotary excavating machine through a group of bolt components (2); the excircle of the large semi-ring pipe (12) is welded or fixedly connected with the upper part of the guide pipe (5).

7. The guiding device for large-diameter pile group hole construction according to claim 4, is characterized in that: and a rubber pad (15) is padded between the small semi-ring pipe (11) and the rotary drilling machine drill rod (1).

Technical Field

The invention relates to a method for constructing large-diameter pile group holes and a guide device, and belongs to the technical field of building construction.

Background

Urban construction land is increasingly tense, and ultrahigh buildings are gradually increased. The super-high building will result in great increase of bearing capacity of foundation, and in order to reduce the number of pile foundations and increase the bearing capacity of single pile, the pile foundations gradually develop to large diameter. Because the construction method is limited to the influence of the existing mechanical equipment and construction method, how to integrate various construction processes by improving a mechanical device is to greatly improve the construction progress of the large-diameter engineering pile, and the method is a current attack object. When large-diameter piles are constructed at present (piles with the diameter of more than or equal to 2 meters are generally called large-diameter piles in the field), firstly, groups of holes are drilled along the edges of the large-diameter piles according to the diameter of the large-diameter piles, so that the integrity of rock strata is broken in advance, and the hole forming progress of the large-diameter piles is accelerated. Then, excavating the large-diameter pile by adopting a rotary excavating machine. The drilling quality of the group hole will directly affect the excavation quality of the large diameter pile. In the prior art, when group hole drilling is carried out, no guide device is arranged, and hole deviation and hole waste are easily caused, so that the quality and the progress of large-diameter pile holes are influenced. Therefore, the prior art still has the defects and needs to be further improved.

Disclosure of Invention

The invention aims to provide a method and a guide device for group hole construction of large-diameter piles, so as to ensure the positioning accuracy and the effective control of verticality in the group hole drilling process, avoid deviation and waste holes in the group hole construction process, achieve the integrity of an advanced broken rock stratum and accelerate the hole forming progress of the large-diameter piles, and further overcome the defects in the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme:

the invention relates to a method for constructing a group hole of a large-diameter pile, which comprises the following steps of utilizing a drill rod of a rotary drilling machine as a positioning reference; removing the drill bit of the rotary drilling machine, replacing the drill bit with a positioning flange with the same diameter as the drill bit of the rotary drilling machine, and welding a group of vertical pipes along the circumference of the positioning flange to be used as guide pipes of the group holes; the upper part of the guide pipe is fixedly connected with a pair of semicircular hoops; and after one group of holes are drilled, rotating the drill rod of the rotary drilling machine by a certain angle and then drilling the other group of holes until all the group of holes are drilled.

In the method, the distance between the pair of semi-circular hoops and the positioning flange is 3-5 m; when the guide pipe is fixedly connected with the pair of semicircular hoops, the verticality of the guide pipe is ensured.

In the method, a rubber pad is padded between the pair of semi-circular hoops and the rotary excavating machine drill rod so as to increase the friction force between the semi-circular hoops and the rotary excavating machine drill rod and ensure that no relative movement exists between the semi-circular hoops and the rotary excavating machine drill rod.

The guide device for large-diameter pile group hole construction, which is formed according to the method and is used for the method, comprises a rotary excavating machine drill rod; the bottom end of a drill rod of the rotary drilling machine is fixedly connected with a positioning flange through a group of bolt assemblies; a drill rod of the rotary excavating machine above the positioning flange is fixed through a pair of semicircular hoops; the positioning flange is characterized in that a group of guide pipes which are vertically arranged are uniformly distributed on the outer circle of the positioning flange along the circumference, the lower end of each guide pipe is welded with the positioning flange, and the upper end of each guide pipe is fixedly connected with a pair of semicircular hoops.

In the guide device, the positioning flange comprises a small ring pipe and a large ring pipe, and the small ring pipe and the large ring pipe are welded into an integral structure through a group of uniformly distributed I-shaped steel; the small ring pipe is internally welded with a flange plate, the bottom of the flange plate is provided with a group of reinforcing plates which are uniformly distributed along the circumference, and the flange plate is connected with the bottom end of a drill rod of the rotary excavating machine through a group of bolt assemblies; the excircle of the large ring pipe is vertically welded with the guide pipe.

In the guide device, the semicircular hoop comprises a small semicircular pipe and a large semicircular pipe, and an integral structure is formed by welding a group of uniformly distributed I-steel and channel steel between the small semicircular pipe and the large semicircular pipe; the channel steel is provided with a connecting hole, and the pair of semicircular hoops are hooped on a drill rod of the rotary excavating machine through a group of bolt assemblies; the excircle of the large half ring pipe is welded or fixedly connected with the upper part of the guide pipe.

In the guide device, a rubber pad is padded between the small semi-ring pipe and the drill rod of the rotary drilling machine.

By adopting the technical scheme, compared with the prior art, when the multi-hole drilling machine is used for performing multi-hole construction, the drill bit enters the pile through the guide pipe to form directional drilling operation, the drilling position and the verticality control are ensured, and meanwhile, a plurality of drilling machines can simultaneously perform operation under the condition allowed by a working face, so that the multi-hole drilling construction progress is accelerated. After the first group of holes are constructed, the rotary drilling rod is rotated to the second group of holes for drilling, and the steps are repeated until the first group of holes are constructed.

Drawings

FIG. 1 is a schematic view of a large diameter pile group hole to be drilled;

FIG. 2 is a schematic diagram of the structural principle of the present invention;

FIG. 3 is a schematic structural view of a positioning flange of the present invention;

fig. 4 is a schematic structural view of the semicircular band of the present invention.

The labels in the figures are: 1-a rotary drilling machine drill rod, 2-a bolt assembly, 3-a positioning flange, 4-a semicircular hoop, 5-a guide pipe, 6-a small circular pipe, 7-a large circular pipe, 8-I-steel, 9-a flange plate, 10-a reinforcing plate, 11-a small circular pipe, 12-a large circular pipe, 13-channel steel, 14-a connecting hole, 15-a rubber pad, 16-a steel casing and 17-a group of holes.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

According to the construction method of the large-diameter pile group hole, as shown in fig. 2, a drill rod 1 of a rotary excavating machine is used as a positioning reference; removing the drill bit of the rotary drilling machine, replacing the drill bit with a positioning flange 3 with the same diameter as the drill bit of the rotary drilling machine, and welding a group of vertical pipes along the circumference of the positioning flange 3 to be used as guide pipes 5 of the group holes; the upper part of the guide pipe 5 is fixedly connected with a pair of semicircular hoops 4; after drilling one group of holes, rotating the drill rod 1 of the rotary drilling machine by a certain angle and then drilling another group of holes 17 until all the group of holes 17 are drilled. The distance between the pair of the circular hoops and the positioning flange 3 is 3-5 m; when the guide pipe 5 is fixedly connected with the pair of semicircular hoops 4, the verticality of the guide pipe 5 is ensured. A rubber pad 15 is arranged between the pair of semicircular hoops 4 and the rotary excavating machine drill rod 1 in a cushioning mode, so that friction force between the semicircular hoops 4 and the rotary excavating machine drill rod 1 is increased, and no relative movement between the semicircular hoops 4 and the rotary excavating machine drill rod 1 is guaranteed.

The guide device for large-diameter pile group hole construction, which is constructed and used in the method, comprises a rotary excavator drill rod 1, as shown in figures 2 to 4; the bottom end of a drill rod 1 of the rotary drilling machine is fixedly connected with a positioning flange 3 through a group of bolt assemblies 2; a rotary excavating machine drill rod 1 above the positioning flange 3 is fixed through a pair of semicircular hoops 4; the outer circle of the positioning flange 3 is evenly distributed with a group of guide pipes 5 which are vertically arranged along the circumference, the lower ends of the guide pipes 5 are welded with the positioning flange 3, and the upper ends of the guide pipes 5 are fixedly connected with a pair of semi-circular hoops 4.

As shown in fig. 3, the positioning flange 3 comprises a small ring pipe 6 and a large ring pipe 7, and the small ring pipe 6 and the large ring pipe 7 are welded through a group of uniformly distributed i-shaped steel 8 to form an integral structure; a flange plate 9 is welded in the small ring pipe 6, a group of reinforcing plates 10 which are uniformly distributed along the circumference are arranged at the bottom of the flange plate 9, and the flange plate 9 is connected with the bottom end of the drill rod 1 of the rotary drilling machine through a group of bolt assemblies 2; the excircle of the large ring pipe 7 is vertically welded with the guide pipe 5.

As shown in fig. 4, the semicircular hoop 4 comprises a small semi-ring pipe 11 and a large semi-ring pipe 12, and the small semi-ring pipe 11 and the large semi-ring pipe 12 are welded together through a set of uniformly distributed i-steel 8 and channel steel 13; a connecting hole 14 is formed in the channel steel 13, and a pair of semicircular hoops 4 are hooped on the drill rod 1 of the rotary drilling machine through a group of bolt assemblies 2; the excircle of the large half ring pipe 12 is welded or fixedly connected with the upper part of the guide pipe 5. As shown in fig. 2, a rubber pad 15 is padded between the small half-collar 11 and the rotary excavating machine drill rod 1.

In specific implementation, the guiding device is formed by mechanically connecting or welding the drill rod 1 of the rotary drilling machine and the positioning flange 3. Before construction, the drill bit of the rotary excavating machine is detached, as shown in fig. 2, the drill bit is replaced by a positioning flange 3 with the same diameter as the drill bit of the rotary excavating machine, the connecting caliber of the upper part of the positioning flange 3 is consistent with that of the drill bit of the rotary excavating machine, and the drill bit is fixedly connected with the bottom end of a drill rod 1 of the rotary excavating machine through a bolt assembly 2 or a bolt. And 3 m above the positioning flange 3, and the rotary drilling machine drill rod 1 is tightened by using a pair of half circular hoops 4 through the rotary drilling machine drill rod 1. The diameter of the pair of the half circular hoops 4 is equal to the diameter of the positioning flange 3. The semicircular hoop 4 is formed by welding I-shaped steel 8 and channel steel 13 as shown in figure 4. Before construction, a steel plate hoop consisting of two small semi-circular pipes 11 is arranged according to the diameter of a drill rod 1 of the rotary drilling machine, wherein the height of the hoop is 350mm, and the thickness of the hoop is 20 mm. The small semi-ring pipe 11 and the big semi-ring pipe 12 are welded into a whole through I-shaped steel 8 and channel steel 13, and a group of connecting holes 14 are drilled in the channel steel 13. Before the semicircular hoops 4 are fixed, a rubber pad 15 is arranged at the joint of the small semicircular pipe 11 and the rotary excavating machine drill rod 1 to increase the frictional resistance, and the pair of semicircular hoops 4 are fixed and screwed down through the bolt assemblies 2 and cannot slide. The I-shaped steel 8 and the channel steel 13 are uniformly distributed and welded between the small semi-ring pipe 11 and the large semi-ring pipe 12, the welding seam quality needs to be guaranteed in the welding process, equal height and equal length of the I-shaped steel 8 and the channel steel 13 are guaranteed, the installation is straight, the diameter of the pair of half circular hoops 4 which are combined together is checked after the welding is completed, and the diameter of the pair of half circular hoops is equal to the diameter of the positioning flange 3.

The guide tube 5 is made of six seamless steel tubes of phi 108x 6. The guide pipe 5 is vertically fixed on the positioning flange 3 and the excircle of the pair of semicircular hoops 4. The upper end and the lower end of the guide pipe 5 are not sealed, the lower end of the guide pipe 5 is flush with the bottom opening of the positioning flange 3 during welding, the upper end of the guide pipe 5 exceeds the upper opening of the semicircular hoop 4 by 200mm, and the perpendicularity control can be carried out through a hanging wire or measurement during welding, and the outer wall of the guide pipe 5 is ensured to be in the steel casing 16 after the welding is finished.

After the whole assembly of the guide device is completed, the guide device is placed in the orifice to test rotation, and after the test rotation, the lifting inspection is carried out, so that the construction can be carried out without looseness, falling off and deformation. And (3) drilling the drill rod of the drilling machine downwards through the guide pipe 5, and simultaneously drilling by a plurality of drilling machines under the condition that the working surface allows, so that the drilling machine drills from the rock stratum surface to the position of the elevation of the bottom of the pile foundation. After the construction of each group of six holes is completed, the rotary drilling machine drill rod 1 is rotated by a certain angle, the second group of holes 17 is constructed, the operation is repeated until all the groups of holes 17 are constructed, the positioning flange 3 is removed, and the rotary drilling bit or the gas-lift reverse circulation drill bit is replaced to carry out hole forming construction.

The invention can ensure the positioning accuracy and the effective control of the verticality in the group hole drilling process, and avoid the deviation and the waste hole in the group hole construction process, thereby achieving the integrity of the advanced broken rock stratum and accelerating the hole forming progress of the large-diameter pile.