Karst landform carrier pile construction process

Abstract

The invention discloses a carrier pile construction technology applied to karst geology. The carrier pile construction technology comprises the following steps that the pile hole position of a carrier pile is measured and positioned; a drilling machine leads a hole to form a pile hole to a bedrock below the karst cave, and the pipe pile sinks into the bedrock; filling and tamping the tubular pile to form a carrier; concrete is poured into the pipe pile to the set height to complete construction of the carrier pile; the carrier pile rotary digging pile planting technology is developed on the basis of pipe pile rotary digging pile planting, a carrier pile is an end bearing pile, so that side friction resistance has no influence on bearing capacity weakening, meanwhile, due to the fact that the water and sediment mixture is tamped at the end through a heavy hammer, a low-layer rock surface can be effectively tamped to be flat, and the bearing capacity is improved. The rock stratum and the pile body are bonded together through the pile end carrier, stress concentration does not exist, the quality is better, meanwhile, the requirement of the carrier pile rotary digging pile planting technology for the quality of the guide hole is not high, and therefore the rotary digging guide hole can adopt a dry method or a wet method and is not afraid of the influence of hole collapse.

Description

Technical Field

[0001] The invention relates to the technical field of carrier pile construction, and in particular to a karst landform carrier pile construction process. Background Art

[0002] At present, for pile foundation construction in karst landform environment, rotary bored pile construction is generally adopted. However, due to the existence of unfavorable conditions such as underground caves, the hole is very easy to collapse during drilling. At the same time, the over-pouring of concrete is serious during the concrete pouring process. If full-length steel pipe wall protection is used, the steel pipe cannot be pulled out. Therefore, the construction speed, quality and cost are not ideal.

[0003] For karst landforms, rotary bored piles need to eventually enter bedrock without caves (within 5m), and need to enter bedrock with a diameter of 2 times. Therefore, the cave area must be filled completely or steel pipes must be used for wall protection. If the pipe pile rotary bored pile method is used, although the cave does not need to be filled completely and steel pipes are not used for wall protection, the underground rock formation is not a complete plane, and there is stress concentration after the end of the pipe pile enters the rock formation, which is prone to damage. At the same time, due to the limited side friction after the hole is drawn (pipe piles are generally end-bearing piles + friction piles), the bearing capacity generally does not meet the requirements.

[0004] In order to solve the above problems, the present invention provides a karst landform carrier pile construction process to solve the problems of high cost and poor quality of karst landform pile foundation construction in the past. Summary of the invention

[0005] The purpose of the present invention is to provide a karst landform carrier pile construction process to achieve the purpose of improving construction quality and reducing construction costs.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] A karst landform carrier pile construction process comprises the following steps:

[0008] Measure and locate the pile hole position of the carrier pile;

[0009] The drilling rig forms the pile hole and reaches the bedrock under the cave;

[0010] Filling the pile hole with original soil, installing pipe piles and pressing them down to the bedrock;

[0011] Filling the pipe pile with a filler and tamping the filler into the bedrock to form a pile end carrier;

[0012] The construction of the carrier pile is completed by pouring concrete in the pipe pile to a set height.

[0013] Preferably, before positioning the pile hole, advance drilling is used to determine the depth of the cave.

[0014] Preferably, a long auger drill is used to drill the hole.

[0015] Preferably, there is no cave within five meters below the bottom of the pile hole.

[0016] Preferably, the pipe piles are pressed down to the bedrock by hammering or static pressure.

[0017] Preferably, the outer diameter of the pile hole is larger than the outer diameter of the pipe pile, and the outer diameter of the pile hole is at least 50 mm larger than the outer diameter of the pipe pile.

[0018] Preferably, the filler tamping stops after the tamping reaches three-strike penetration.

[0019] Preferably, the pipe pile is prefabricated or processed on site, the cross-sectional shape of the pipe pile is circular or square, and the inner diameter of the pipe pile is greater than 200 mm.

[0020] Compared with the prior art, the present invention has achieved the following technical effects:

[0021] 1. The present invention is a carrier pile rotary drilling and piling process developed on the basis of the development of pipe pile rotary drilling and piling. The carrier pile itself is an end-bearing pile, so the side friction resistance has no effect on the weakening of the bearing capacity. At the same time, since the end is rammed with a heavy hammer to hit the cement sand mixture, the bottom rock surface can be effectively tamped flat, and the rock layer and the pile body are bonded together by the pile end carrier. There is no stress concentration and the quality is better. At the same time, the carrier pile rotary drilling and piling process does not have high requirements on the quality of the hole, so the rotary drilling and piling can adopt both the dry method and the wet method, and is not afraid of the influence of the hole collapse. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Attached Figure 1 It is a construction process flow chart of the present invention. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] The purpose of the present invention is to provide a karst landform carrier pile construction process to achieve the purpose of improving construction quality and reducing construction costs.

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] refer to Figure 1 , a karst landform carrier pile construction process, comprising the following steps: measuring and locating the pile hole position of the carrier pile; drilling a hole to form the pile hole and reach the bedrock under the cave; filling the pile hole with original soil, installing a pipe pile and pressing it down to the bedrock; filling the pipe pile with stuff and tamping the stuff into the bedrock to form a pile end carrier; pouring concrete in the pipe pile to a set height to complete the construction of the carrier pile; the present invention is a carrier pile rotary drilling and piling process developed on the basis of the development of pipe pile rotary drilling and piling. The carrier pile itself is an end-bearing pile, so the side friction resistance has no effect on the weakening of the bearing capacity. At the same time, since the end is tamped by a heavy hammer on the cement-sand mixture, the bottom rock surface can be effectively tamped flat, and the rock layer and the pile body are bonded together by the pile end carrier. There is no stress concentration and the quality is better. At the same time, the carrier pile rotary drilling and piling process does not have high requirements on the quality of the hole, so the rotary drilling and piling can be carried out by both dry method and wet method, without fear of the influence of hole collapse.

[0028] Furthermore, before positioning the pile hole, advance drilling is used to determine the depth of the cave.

[0029] Furthermore, a long spiral drill is used to drill the hole.

[0030] Furthermore, there is no cave within five meters below the bottom of the pile hole.

[0031] Furthermore, the pipe piles are pressed down to the bedrock by hammering or static pressure.

[0032] Furthermore, the outer diameter of the pile hole is larger than the outer diameter of the pipe pile, and the outer diameter of the pile hole is at least 50 mm larger than the outer diameter of the pipe pile.

[0033] Furthermore, the tamping of the filler is stopped after the tamping meets the three-strike penetration.

[0034] Furthermore, the pipe piles are prefabricated or processed on site, the cross-sectional shape of the pipe piles is circular or square, and the inner diameter of the pipe piles is greater than 200 mm.

[0035] Adaptive changes made according to actual needs are all within the protection scope of the present invention.

[0036] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A karst landform carrier pile construction process, characterized in that: The following steps are involved: Measure and locate the pile hole position of the carrier pile; The drilling rig forms the pile hole and reaches the bedrock under the cave; Filling the pile hole with original soil, installing pipe piles and pressing them down to the bedrock; Filling the pipe pile with a filler and tamping the filler into the bedrock to form a pile end carrier; The construction of the carrier pile is completed by pouring concrete in the pipe pile to a set height.

2. A karst landform carrier pile construction process according to claim 1, characterized in that: Before positioning the pile hole, advance drilling is used to determine the depth of the cave.

3. The karst landform carrier pile construction process according to claim 1 is characterized in that: Use a long spiral drill to drill the hole.

4. The karst landform carrier pile construction process according to claim 1 is characterized in that: There is no karst cave within five meters below the bottom of the pile hole.

5. The karst landform carrier pile construction process according to claim 1 is characterized in that: The pipe pile is pressed down to the bedrock by hammering or static pressure.

6. The karst landform carrier pile construction process according to claim 1 is characterized in that: The outer diameter of the pile hole is larger than the outer diameter of the pipe pile, and the outer diameter of the pile hole is at least 50 mm larger than the outer diameter of the pipe pile.

7. The karst landform carrier pile construction process according to claim 1 is characterized in that: The packing tamping stops after the tamping reaches three-strike penetration.

8. The karst landform carrier pile construction process according to claim 1 is characterized in that: The pipe pile is prefabricated or processed on site, the cross-sectional shape of the pipe pile is circular or square, and the inner diameter of the pipe pile is greater than 200 mm.

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