阅读说明：本技术 一种人工挖孔桩的施工方法 (Construction method of manual hole digging pile ) 是由 刘思谋 朱晓飞 高云蛟 刘思广 于 2019-09-05 设计创作，主要内容包括：本发明公开了一种人工挖孔桩的施工方法,利用钻孔机对桩孔井内的硬质基岩进行取芯,形成一个环向的沟槽,之后通过挤扩装置对桩心的基岩进行挤扩,使桩心基岩底部整体断裂,方便将其吊运至桩孔井外。通过该施工方法能够安全快捷地对桩基进行钻孔施工作业。(The invention discloses a construction method of a manual hole digging pile, which is characterized in that a drilling machine is used for coring hard bedrock in a pile hole well to form an annular groove, and then a squeezing and expanding device is used for squeezing and expanding the bedrock of a pile core, so that the bottom of the bedrock of the pile core is integrally fractured, and the pile core is conveniently lifted out of the pile hole well. The construction method can be used for safely and quickly carrying out drilling construction operation on the pile foundation.)

1. A construction method of a manual hole digging pile is characterized by comprising the following steps:

s1: carrying out construction lofting on the pile position to determine the center of the pile position and the circumferential line of the pile position;

s2: removing soil on the upper part of the pile hole well, and pouring concrete around the pile hole well for reinforcement to form a construction platform on the upper part of the pile hole well;

s3: arranging a lifting device on the construction platform, and arranging a ventilation and lighting device in the pile hole well;

s4: cleaning up the residual slag in the pile hole well until bedrock is exposed;

s5: continuously coring along the circumference of the pile hole well by using a core-coring machine to form an annular groove along the circumference of the pile hole well;

s6: hoisting the core sample obtained in the step S5 out of the pile hole well;

s7: arranging a squeezing and expanding device at one side in the annular groove, and applying horizontal acting force on the bed rock of the pile core to break the bed rock of the pile core along the bottom of the groove;

s8: installing a clamp on the fractured bedrock and hoisting the bedrock to the outside of the pile hole well;

s9: repeating the steps S4 to S8 until the depth of the pile hole well reaches the design requirement;

s10: and (5) installing a pile reinforcement cage in the pile hole well, and pouring concrete.

2. The method of constructing a manual dug pile according to claim 1, wherein a ladder is further erected on the wall of the pile hole shaft for a worker to get on and off in the step S3.

3. The method of constructing a manual dug pile according to claim 1, wherein the width of the annular groove in the step S5 is between 8cm and 20 cm.

4. The method of constructing a manual bored pile according to claim 1, wherein the coring length with a core extractor in the step S5 is between 50cm and 150 cm.

5. The method of constructing a manual bored pile according to claim 1, wherein not less than three squeeze-enlarging apparatuses are provided at equal intervals on one side in the annular groove in the step S7.

6. The method of constructing a manual dug pile according to claim 1, wherein the constructor in the pile hole well withdraws the pile hole well before the broken bedrock is lifted at the step S8.

7. The method of constructing a manual dug pile as claimed in claim 1, wherein the upper end of the reinforcement cage exceeds a pile top elevation of the pile by 50cm to 100cm in the step S10.

8. The method of constructing a manual bored pile according to claim 1, wherein in step S5, water is intermittently injected into the coring barrel while the coring operation of the coring machine is performed.

9. The method for constructing a manual dug pile according to claim 1, wherein the step S8 is finished by cutting and grinding the support rib on the inner wall of the pile hole well.

Technical Field

The invention relates to the technical field of pile foundation construction, in particular to a construction method of a manual hole digging pile.

Background

The manual hole digging pile is a reinforced concrete pile which is manually dug and poured on site. The manual hole digging pile is convenient to construct and high in speed, large-scale mechanical equipment is not needed to enter a field, and the construction cost can be reduced. Especially in mountain areas or narrow construction site sections, large mechanical equipment cannot enter the field, and the manual hole digging pile has obvious advantages. However, the underground operation condition of the manual hole digging pile is poor, the construction environment is severe, and the labor intensity is high. Especially, when encountering a foundation stratum, the directional blasting needs to be carried out by explosives, and the directional blasting is more suitable in a sparse zone such as a mountain area and the like. However, when manual pile digging is performed in dense people areas such as cities or places where road traffic cannot be interrupted, the adoption of directional blasting brings certain potential safety hazards. In order to ensure the safety of construction operators and pedestrians, avoid the danger caused by blasting operation, and reduce the labor intensity of worker operation, a safe and convenient construction method for manual hole digging piles is needed.

Disclosure of Invention

The invention aims to solve the technical problems and provide a construction method of a manual hole digging pile, which can reduce labor intensity and accelerate construction speed while ensuring construction safety.

In order to achieve the above object, the present invention provides a construction method of a manual bored pile, including the steps of:

s1: carrying out construction lofting on the pile position to determine the center of the pile position and the circumferential line of the pile position;

s2: removing soil on the upper part of the pile hole well, and pouring concrete around the pile hole well for reinforcement to form a construction platform on the upper part of the pile hole well;

s3: arranging a lifting device on the construction platform, and arranging a ventilation and lighting device in the pile hole well;

s4: cleaning up the residual slag in the pile hole well until bedrock is exposed;

s5: continuously coring along the circumference of the pile hole well by using a core-coring machine to form an annular groove along the circumference of the pile hole well;

s6: hoisting the core sample obtained in the step S5 out of the pile hole well;

s7: arranging a squeezing and expanding device at one side in the annular groove, and applying horizontal acting force on the bed rock of the pile core to break the bed rock of the pile core along the bottom of the groove;

s8: installing a clamp on the fractured bedrock and hoisting the bedrock to the outside of the pile hole well;

s9: repeating the steps S4 to S8 until the depth of the pile hole well reaches the design requirement;

s10: and (5) installing a pile reinforcement cage in the pile hole well, and pouring concrete.

Further, in step S3, a ladder is further erected on the wall of the pile hole for the construction worker to enter and exit the pile hole.

Further, the width of the annular groove in the step S5 is between 8cm and 20 cm.

Further, the length of coring by using the core-taking machine in the step S5 is between 50cm and 150 cm.

Further, in the step S7, at least three squeezing devices are equidistantly arranged on one side of the annular groove.

Further, before the broken bedrock is lifted in the step S8, the constructor in the pile hole well withdraws the pile hole well.

Further, in the step S10, the upper end of the reinforcement cage exceeds the pile top elevation of the pile by 50-100 cm.

Further, in step S5, when the core barrel is coring, water is intermittently injected into the core barrel.

Further, after the step S8 is finished, cutting and polishing are performed on the support ridge on the pile hole wall.

According to the above description and practice, the construction method of the manual hole digging pile of the invention utilizes the drilling machine to core the hard bedrock in the pile hole well to form an annular groove, and then the squeezing and expanding device is used to squeeze and expand the bedrock of the pile core, so that the whole pile core bedrock is broken, and the pile core bedrock is conveniently lifted out of the pile hole well. The construction method avoids blasting operation, optimizes the operation environment in the pile hole well, and reduces the labor intensity of workers. The whole foundation rock of the pile core is hoisted out, the hoisting times are reduced, the construction efficiency is improved, and the risk factors caused by multiple hoisting can be avoided. The construction method can be used for safely and quickly carrying out construction operation on the manual hole digging pile.

Drawings

Fig. 1 is a schematic geological structure of a position where a manual hole digging pile is involved in one embodiment of the present invention.

FIG. 2 is a schematic view of a coring position involved in one embodiment of the present invention.

FIG. 3 is a schematic view of the layout of a companding apparatus according to an embodiment of the present invention.

Fig. 4 is a schematic view of the handling of the socle bed rock involved in an embodiment of the invention.

Fig. 5 is a schematic flow chart of a construction method of a manual bored pile according to an embodiment of the present invention.

In the figure: 1. the method comprises the following steps of filling a mixed soil layer, 2, a mud rock layer, 3, a strongly weathered rock layer, 4, an intermediate weathered rock layer, 5, a slightly weathered rock layer, 6, a pile hole well, 7, a core taking hole, 8, an extruding and expanding device, 9 and a self-tightening clamp.

Detailed Description

An embodiment of a construction method of a manual bored pile according to the present invention will be described with reference to the accompanying drawings. Those of ordinary skill in the art will recognize that the described embodiments can be modified in various different ways, without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are illustrative in nature and not intended to limit the scope of the claims. Furthermore, in the present description, the drawings are not to scale and like reference numerals refer to like parts.

Fig. 1 is a schematic geological structure of a position where a manual hole digging pile is involved in one embodiment of the present invention. FIG. 2 is a schematic view of a coring position involved in one embodiment of the present invention. FIG. 3 is a schematic view of the layout of a companding apparatus according to an embodiment of the present invention. Fig. 4 is a schematic view of the handling of the socle bed rock involved in an embodiment of the invention. Fig. 5 is a schematic flow chart of a construction method of a manual bored pile according to an embodiment of the present invention.

As shown in fig. 5, the construction method of the artificial dug pile provided by the present invention mainly includes the following steps:

step S1: and (5) performing construction lofting on the pile position to determine the center of the pile position and the circumferential line of the pile position.

Step S2: and removing soil on the upper part of the pile hole well, and pouring concrete around the pile hole well for reinforcement to form a construction platform on the upper part of the pile hole well.

Step S3: and a hoisting device is arranged on the construction platform, and a ventilation and lighting device is arranged in the pile hole well.

Step S4: and cleaning the residual slag in the pile hole well until the bedrock is exposed.

Step S5: and continuously coring along the circumference of the pile hole well by using a core-coring machine to form an annular groove along the circumference of the pile hole well.

Step S6: and (4) hoisting the core sample obtained in the S5 out of the pile hole well.

Step S7: and arranging a squeezing and expanding device on one side in the annular groove, and applying horizontal acting force on the bed rock of the pile core to break the bed rock of the pile core along the bottom of the groove.

Step S8: and installing a clamp on the fractured bedrock and hoisting the bedrock to the outside of the pile hole well.

Step S9: and repeating the steps S4 to S8 until the depth of the pile hole well reaches the design requirement.

Step S10: and (5) installing a pile reinforcement cage in the pile hole well, and pouring concrete.

The construction method is described below with reference to a certain municipal engineering, in which a bridge is located in a busy section in the city center, the diameter of a pile foundation is 2 meters, the length of the pile is 16 meters, the ground water level is below the pile bottom, and the geological structure is shown in fig. 1, which is sequentially from top to bottom: the miscellaneous fill layer is 1, and the thickness is 2 meters; a mudstone layer of 2 m thickness; the thickness of the strongly weathered rock stratum is 3 meters; 4 m thick medium weathered rock stratum; slightly weathered rock formations 5 with a thickness of more than 10 metres. The concrete construction steps are as follows:

step S1: and (5) performing construction lofting on the position of the pile, and determining the center of the pile position and the circumferential line of the pile position.

Step S2: excavating and cleaning soil in the miscellaneous fill layer 1 at the position of the pile by using an air pick, and transporting the muck to the outside of the pile hole well to form a round pit slightly larger than the diameter of the pile hole well; and erecting a template in the pit along the periphery of the pile hole well and pouring concrete for reinforcement to form a construction platform positioned at the upper part of the pile hole well.

Step S3: arranging a hoisting device on the construction platform, and forming the hoisting device by selecting a crane or erecting a bracket above the pile hole well and matching with a pulley and a winch, wherein the latter is selected in the embodiment; then placing a ventilation pipe and erecting a ladder in the pile hole well, and erecting a lighting device on the inner wall of the pile hole well.

Step S4: and cleaning up the residual slag in the pile hole well until the hard bedrock is exposed, and at the moment, the air pick is not suitable to be continuously used for digging the hole. In this example, the mudstone layer 2, the strongly weathered rock layer 3, the moderately weathered rock layer 4, and the slightly weathered rock layer 5 are all considered as hard bedrocks.

Step S5: referring to fig. 2, a schematic of the location of the coring holes 7 is shown. The coring operation is carried out continuously along the circumference of the pile hole shaft 6 by means of a rock core drill or a concrete core drill, finally forming an annular groove along the circumference of the pile hole shaft, the width of which is in the range of 8cm to 20cm, the width of which can be varied by varying the coring range, in this embodiment the width of the annular groove is about 10 cm. During coring operation, water needs to be intermittently injected into the coring barrel so as to reduce the temperature of the coring barrel, avoid dust raising and optimize the operation environment. In addition, in this embodiment, select the rock coring machine, its coring section of thick bamboo's diameter is 100mm, and length is 1 meter, can also change the length of coring section of thick bamboo according to actual demand certainly to adapt to different geological environment. It is easy to know that the annular groove is not absolute annular, and because the core sample taken by the core-taking machine is cylindrical, a plurality of vertical ribs are formed on the inner wall of the pile hole well and the outer wall of the pile core bedrock.

Step S6: and (5) hoisting the core sample obtained in the step (S5) to the outside of the pile hole well through the hoisting machine.

Step S7: referring to fig. 3, three hydraulic squeezing and expanding devices 8 are equidistantly arranged on one side in the annular groove, the diameter of a squeezing and expanding head of each hydraulic squeezing and expanding device 8 is 8cm, and the base rock of the pile core is fractured along the bottom of the annular groove by applying horizontal acting force to the base rock of the pile core through the squeezing and expanding head.

Step S8: referring to fig. 4, a self-tightening clamp 9 is installed on the fractured bedrock and connected to a winch, and then an operator withdraws from the pile hole well and finally lifts the bedrock out of the pile hole well. Through this self-clinching formula anchor clamps, can vertical holding bed rock to vertical effort is big more, and this anchor clamps are big more to the clamping force of bed rock. The foundation rock can be hoisted out of the pile hole well by drilling the upper end of the foundation rock and installing a hoisting rod. And finally, cutting and grinding the support edge formed in the step S5 to enable the internal flatness of the pile hole well to meet the design requirement.

Step S9: and repeating the steps S4 to S8 until the depth of the pile hole well reaches the depth required by the design.

Step S10: and (5) installing a pile reinforcement cage according to design requirements in the pile hole well, fixing, and pouring concrete to finish the pile. The upper end of the pile steel reinforcement cage exceeds the pile top elevation of the pile by 50cm and is used for extending into a bearing platform above the pile steel reinforcement cage to serve as an anchoring rib of the bearing platform. Thus, the construction work of the manual bored pile is completed.

The construction method of the manual hole digging pile provided by the embodiment can avoid dangerous factors caused by blasting operation, greatly quickens the construction progress, and improves the underground operation environment of the pile hole.

The construction method of the artificial dug pile according to the present invention is described above by way of example with reference to the accompanying drawings. However, it should be understood by those skilled in the art that various modifications may be made to the construction method of the artificial dug pile proposed by the present invention without departing from the scope of the present invention. Therefore, the scope of the present invention should be determined by the contents of the appended claims.