Construction method of manual hole digging pile under slope topographic condition

Abstract

The invention discloses a construction method of a manual hole digging pile under a slope topographic condition. The construction method comprises the following steps: constructing an orifice retainer and a bracket foundation on a slope; the support foundation comprises a first support foundation located on the upper side of the orifice retainer and a second support foundation located on the lower side of the orifice retainer. A scaffold operation platform is erected, and two supporting legs of the scaffold operation platform are located on the first support foundation and the second support foundation respectively; a soil body is excavated at the position of the manual hole digging pile, excavation is conducted downwards layer by layer in a segmented mode, dado concrete is poured in sequence, and prestressed anchor bars are constructed on the upper side of the dado in the construction process. The first support foundation and the second support foundation serve as supporting faces of the scaffold operation platform on the one hand and can serve as anti-slip belts of the hole opening protection ring on the other hand, the problem that the protection ring is subjected to unbalance loading during manual hole digging is solved, prestressed anchor bars are constructed on the upper side of the protection wall, stability of the protection wall is guaranteed, heavy excavation is avoided for operation, and the construction efficiency is improved. And the stability and safety of the operation platform are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of construction engineering, and in particular to a construction method of artificial bored piles under slope terrain conditions. Background Art

[0002] Manual bored piles are piles that are dug manually and then have a steel cage installed and concrete poured to support the upper structure. The conventional method for manual bored piles is to cast a section of annular concrete retaining wall in the hole every 1m of digging, with a wall thickness of 100-150mm, to support the surrounding soil and protect personal safety.

[0003] Manual bored pile construction machinery and equipment are simple and easy to enter and exit. The vertical transportation equipment for manual bored pile construction generally uses a 1t electric hoist or a 0.5t winch; a submersible pump is generally used as a water discharge and suction machine; rock drilling tools generally use light pneumatic picks, pneumatic drills and air compressors, and require blowers, electric welding machines, etc. Except for the air compressor, the above equipment is small, light, and easy to move. It is very suitable for construction operations on steep slopes and inclined slopes that cannot be reached by large equipment.

[0004] Because there is no stable and reliable operating platform space for personnel and machinery on the inclined slope, the following method is generally used to solve the problem: the slope at the pile position is cut and excavated to form a stable construction platform with sufficient width. This method often requires a large amount of earth and stone excavation and poor economic efficiency. The newly formed slope often lacks protection, and the risk of landslides after rain erosion is high, which is very dangerous for workers working in the hole. Summary of the invention

[0005] Based on this, it is necessary to provide a construction method of artificial bored piles under slope terrain conditions to address the problems of large earth and stone excavation volume and high landslide risk in the existing construction method of artificial bored piles.

[0006] A method for constructing artificial bored piles under slope terrain conditions, comprising:

[0007] Constructing an orifice retainer and a support foundation on the slope; the support foundation includes a first support foundation located on the upper side of the orifice retainer and a second support foundation located on the lower side of the orifice retainer;

[0008] Setting up a scaffolding operating platform, wherein two legs of the scaffolding operating platform are respectively positioned on the first support foundation and the second support foundation;

[0009] The soil is excavated at the location of the bored piles, and the excavation is carried out downward layer by layer and section by section, and the retaining wall concrete is poured in sequence. During the construction process, prestressed anchor bars are constructed on the upper side of the retaining wall.

[0010] In one embodiment, the steps of constructing the hole retainer and the support foundation on the slope are specifically as follows:

[0011] The positions of the orifice retaining ring and the support foundation are measured and marked out, and excavation, formwork, steel bar tying and concrete pouring are performed to form the orifice retaining ring and the support foundation; the support foundation and the orifice retaining ring are connected by connecting steel bars.

[0012] In one of the embodiments, the support foundation is provided with anchoring steel bars anchored in the soil.

[0013] In one embodiment, the orifice retainer has a first end surface and a second end surface opposite to each other, the first end surface and the second end surface are parallel to each other, and the second end surface is parallel to the slope.

[0014] In one embodiment, the height of the guard wall on the side close to the top of the slope is greater than the height of the guard wall on the side close to the bottom of the slope.

[0015] In one of the embodiments, the inclination angle of the end surface of the retaining wall relative to the horizontal plane gradually decreases along the depth direction of the manually excavated pile until the end surface of the retaining wall is parallel to the horizontal plane.

[0016] In one embodiment, the heights of the multiple sections of the retaining wall close to the bottom of the slope are the same, and the heights of the multiple sections of the retaining wall close to the top of the slope gradually decrease along the depth direction of the bored piles.

[0017] In one of the embodiments, after the upper and lower end surfaces of the retaining wall are parallel to the horizontal plane, conventional retaining wall construction methods are used for construction.

[0018] In one embodiment, the steps of constructing prestressed anchor bars on the upper side of the retaining wall are specifically as follows:

[0019] After the soil is excavated in layers, prestressed anchor bars are placed in the soil on the upper side of the retaining wall, and steel bars are reserved within the range of the retaining wall to connect the anchor heads. The prestressed anchor bars are connected to the anchor heads, and then the retaining wall concrete is poured.

[0020] In one embodiment, the width of the second support base along the slope direction is greater than the width of the first support base along the slope direction.

[0021] The construction method of artificial bored piles under the above-mentioned slope terrain conditions has at least the following advantages:

[0022] The first bracket foundation and the second bracket foundation are designed on the upper and lower sides of the hole guard ring. The first bracket foundation and the second bracket foundation serve as the support surface of the scaffolding operating platform on the one hand, and can serve as the anti-slip belt of the hole guard ring on the other hand, solving the problem of partial load on the manual hole guard ring. Prestressed anchor bars are constructed on the upper side of the retaining wall to ensure the stability of the retaining wall. The two brackets of the scaffolding operating platform are respectively located on the first bracket foundation and the second bracket foundation, avoiding large excavation for operation, ensuring the stability and safety of the operating platform, improving the convenience of construction, and shortening the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation of the present invention, the following will briefly introduce the drawings required for use in the specific implementation. In all the drawings, each element or part is not necessarily drawn according to the actual scale.

[0024] Figure 1 A flowchart of a method for constructing artificial bored piles under slope terrain conditions in one embodiment;

[0025] Figure 2 Schematic diagram of the construction of the hole retaining ring and support foundation on the slope;

[0026] Figure 3 A schematic diagram of connecting the first support foundation and the second support foundation with the orifice retainer;

[0027] Figure 4 It is a schematic diagram of the connection between the support foundation and the hole retaining ring through connecting steel bars;

[0028] Figure 5 A schematic diagram of a scaffolding operating platform station located on a first support foundation and a second support foundation;

[0029] Figure 6 for Figure 5 A plan view of the scaffolding operating platform shown;

[0030] Figure 7 Schematic diagram for excavation of bored piles;

[0031] Figure 8 Schematic diagram for construction of prestressed anchor bars and reserved anchor heads;

[0032] Fig. 9 A schematic diagram of the construction of the first section of retaining wall;

[0033] Fig.10 This is a schematic diagram of constructing multiple sections of retaining walls in sequence.

[0034] Reference numerals:

[0035] 1-slope, 10-hole guard ring, 11-first support foundation, 12-second support foundation, 13-connecting steel bars, 14-anchor steel bars, 20-scaffolding operating platform, 30-prestressed anchor bars, 31-anchor head, 40-wall protection. DETAILED DESCRIPTION

[0036] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the invention is not limited by the specific implementation disclosed below.

[0037] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0039] See also Figure 1 , a method for constructing artificial bored piles under slope terrain conditions in one embodiment comprises the following steps:

[0040] Step S110 : constructing an orifice retainer 10 and a support foundation on the slope 1 ; the support foundation comprises a first support foundation 11 located on the upper side of the orifice retainer 10 and a second support foundation 12 located on the lower side of the orifice retainer 10 .

[0041] See also Figure 2 and Figure 3Specifically, the positions of the orifice retainer 10 and the support foundation are measured and laid out, and excavation, formwork, steel bar tying and concrete pouring are carried out. The support foundation includes a first support foundation 11 and a second support foundation 12. The first support foundation 11 is located on the upper side of the orifice retainer 10, and the second support foundation 12 is located on the lower side of the orifice retainer 10. The first support foundation 11 and the second support foundation 12 can serve as the support surface of the scaffolding operating platform 20 on the one hand, and can serve as the anti-slip belt of the orifice retainer 10 on the other hand, for supporting the orifice retainer 10 to solve the problem of the orifice retainer 10 being subjected to eccentric load.

[0042] In one embodiment, the width of the second bracket eye in the direction of the slope 1 is greater than the width of the first bracket foundation 11 in the direction of the slope 1, and the width of the lower side foundation of the hole retainer 10 is wider, which can improve the anti-slip effect of the second bracket foundation 12. Specifically, the width of the first bracket foundation 11 is 50 cm, and the width of the second bracket foundation 12 is 100 cm.

[0043] Please also read Figure 4 Furthermore, in order to improve the thrust-stopping effect of the anti-slip belt on the orifice retaining ring 10, the support foundation and the orifice retaining ring 10 are connected by connecting steel bars 13. In order to ensure the stability of the first support foundation 11 and the second support foundation 12, the first support foundation 11 and the second support foundation 12 are provided with anchoring steel bars 14 anchored in the soil. That is to say, after the orifice retaining ring 10 and the support foundation are excavated, the anchoring steel bars 14 are constructed within the scope of the first support foundation 11 and the second support foundation 12, and after the formwork is supported, the steel bars are tied and the steel bars of the orifice retaining ring 10 and the steel bars of the support foundation are connected, and finally the concrete is poured.

[0044] Step S120: erecting a scaffolding operating platform 20 , wherein two legs of the scaffolding operating platform 20 are respectively positioned on the first support foundation 11 and the second support foundation 12 .

[0045] Please also read Figure 5 and Figure 6 Specifically, after the concrete of the first support foundation 11 and the second support foundation 12 solidifies and hardens, a scaffold is constructed on the first support foundation 11 and the second support foundation 12, and then an operating platform is constructed on the scaffold. In one embodiment, a plurality of manually dug piles are arranged laterally at intervals on the slope 1, so that the scaffold operating platform 20 laterally covers the entire manually dug piles.

[0046] Step S130: excavating soil at the location of the bored piles, excavating downward layer by layer and pouring concrete for the retaining wall 40, and constructing prestressed anchor bars on the upper side of the retaining wall 40 during the construction process.

[0047] Please also read Figure 7-Figure 9Specifically, after excavating the soil in layers, prestressed anchor bars 30 are placed in the soil on the upper side of the retaining wall 40, and steel bars are reserved within the range of the retaining wall 40 to connect the anchor heads 31. The prestressed anchor bars 30 are connected to the anchor heads 31, and then the concrete of the retaining wall 40 is poured. The prestressed anchor bars 30 are connected on the upper side of the retaining wall 40 to ensure the stability of the retaining ring and avoid displacement caused by the eccentric load of soil pressure.

[0048] Please also read Fig.10 In one embodiment, the hole guard ring 10 has a first end face and a second end face relative to each other, the first end face and the second end face are parallel to each other, and the second end face is parallel to the slope 1. The hole guard ring 10 is in a bamboo-cutting style to avoid large excavation of the slope 1 and increase of soil pressure.

[0049] Furthermore, since the hole guard ring 10 is in a bamboo-cutting style, the multi-section retaining wall 40 constructed in the early stage is also in a bamboo-cutting style as a whole, with the upper part higher and the lower part lower, that is, the height of the retaining wall 40 near the top of the slope is greater than the height of the retaining wall 40 near the bottom of the slope, until the upper and lower ends of the retaining wall 40 are level. Specifically in this embodiment, the inclination angle of the end face of the retaining wall 40 relative to the horizontal plane gradually decreases along the depth direction of the artificial bored pile until the end face of the retaining wall 40 is parallel to the horizontal plane.

[0050] Furthermore, the heights of the multi-section retaining wall 40 near the bottom of the slope are the same, and the heights of the multi-section retaining wall 40 near the top of the slope gradually decrease along the depth direction of the manhole bored piles, that is, the height of the bottom of the retaining wall 40 remains unchanged while the height of the top of the retaining wall 40 gradually decreases, ultimately achieving the upper and lower parallelism of the end faces of the retaining wall 40.

[0051] In one embodiment, after the upper and lower end surfaces of the retaining wall 40 are parallel to the horizontal plane, the conventional retaining wall 40 construction method is used for construction. After the upper and lower end surfaces of the retaining wall 40 are parallel to the horizontal plane, the retaining wall 40 has the same structural shape as the conventional retaining wall 40, and the conventional construction method can be used at this time, that is, after each preset depth is dug, a section of annular concrete retaining wall 40 is cast in place in the hole to support the surrounding soil and protect personal safety.

[0052] The construction method of bored piles under the above-mentioned slope terrain conditions solves the problem of the artificial bored pile retaining ring being subjected to eccentric loading under the inclined slope construction conditions, and realizes the avoidance of large excavation for operation. The present invention realizes the stability and safety of the scaffolding operating platform 20, improves the convenience of construction, and shortens the construction period. The present invention has strong applicability, can meet the requirements of artificial bored pile construction on inclined slopes with a slope of less than 55°, and has strong versatility. The present invention has good operability. Except for the front hole retaining ring 10 and the 4-5 section retaining wall 40, which are unconventional structural constructions, the rest of the operations are conventional constructions, and have good promotional properties.

[0053] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A method for constructing artificial bored piles under slope terrain conditions, characterized in that: include: Constructing an orifice retainer and a support foundation on the slope; the support foundation includes a first support foundation located on the upper side of the orifice retainer and a second support foundation located on the lower side of the orifice retainer; Setting up a scaffolding operating platform, wherein two legs of the scaffolding operating platform are respectively positioned on the first support foundation and the second support foundation; The soil is excavated at the location of the bored piles, and the excavation is carried out downward layer by layer and section by section, and the retaining wall concrete is poured in sequence. During the construction process, prestressed anchor bars are constructed on the upper side of the retaining wall.

2. The method for constructing artificial bored piles under slope terrain conditions according to claim 1, characterized in that: The steps of constructing the hole retaining ring and the support foundation on the slope are specifically as follows: The positions of the orifice retaining ring and the support foundation are measured and marked out, and excavation, formwork, steel bar tying and concrete pouring are performed to form the orifice retaining ring and the support foundation; the support foundation and the orifice retaining ring are connected by connecting steel bars.

3. The method for constructing artificial bored piles under slope terrain conditions according to claim 2, characterized in that: The support foundation is provided with anchoring steel bars anchored in the soil.

4. The method for constructing artificial bored piles under slope terrain conditions according to claim 1, characterized in that: The orifice retainer has a first end surface and a second end surface opposite to each other, the first end surface and the second end surface are parallel to each other, and the second end surface is parallel to the slope.

5. The method for constructing artificial bored piles under slope terrain conditions according to claim 1, characterized in that: The height of the side of the guard wall close to the top of the slope is greater than the height of the side of the guard wall close to the bottom of the slope.

6. The method for constructing artificial bored piles under slope terrain conditions according to claim 5, characterized in that: The inclination angle of the end surface of the retaining wall relative to the horizontal plane gradually decreases along the depth direction of the artificially dug pile until the end surface of the retaining wall is parallel to the horizontal plane.

7. The method for constructing artificial bored piles under slope terrain conditions according to claim 6, characterized in that: The heights of the multiple sections of the retaining wall close to the bottom of the slope are the same, and the heights of the multiple sections of the retaining wall close to the top of the slope gradually decrease along the depth direction of the artificial bored piles.

8. The method for constructing artificial bored piles under slope terrain conditions according to claim 6, characterized in that: After the upper and lower end faces of the retaining wall are parallel to the horizontal plane, conventional retaining wall construction methods are used for construction.

9. The method for constructing artificial bored piles under slope terrain conditions according to claim 1, characterized in that: The steps of constructing prestressed anchor bars on the upper side of the retaining wall are specifically as follows: After the soil is excavated in layers, prestressed anchor bars are placed in the soil on the upper side of the retaining wall, and steel bars are reserved within the range of the retaining wall to connect the anchor heads. The prestressed anchor bars are connected to the anchor heads, and then the retaining wall concrete is poured.

10. The method for constructing artificial bored piles under slope terrain conditions according to claim 1, characterized in that: The width of the second support base along the slope direction is greater than the width of the first support base along the slope direction.

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