阅读说明：本技术 一种人工挖孔环形基桩土芯回填薄钢模板体系及施工方法 (Manual hole digging annular foundation pile soil core backfill thin steel template system and construction method ) 是由 姚爱军 董磊 李仁康 田甜 周政 于 2020-12-26 设计创作，主要内容包括：本发明公开了一种人工挖孔环形基桩土芯回填薄钢模板体系及施工方法,采用土芯回填薄钢模板体系进行施工解决了传统人工挖孔空心桩需采用升降设备进行模板支设的问题,通过回填土芯进行薄钢模板支设,作业平台宽阔,施工效率较高,从而优化了施工工序,降低了施工成本。土芯作为模板体系的重要组成,在浇筑混凝土时由于土芯的存在,土压力使模板内壁更加整齐、平整、规则,有效地防止模板涨模、跑浆、漏浆等不良现象出现,大幅提高了环形基桩的成桩质量。(The invention discloses a soil core backfilling thin steel template system of an annular foundation pile for manual hole digging and a construction method. The soil core is used as an important component of the template system, and the inner wall of the template is more orderly, smooth and regular due to the existence of the soil core and the soil pressure when the concrete is poured, so that the adverse phenomena of template mold expansion, slurry leakage and the like are effectively prevented, and the pile forming quality of the annular foundation pile is greatly improved.)

1. The utility model provides a thin steel template system is backfilled to artifical annular foundation pile soil core that digs hole which characterized in that: the connecting steel bars (8) and the steel circular keels (9) are connected by welding; the thin steel formworks (10) of each layer are connected in an overlapping mode, after the thin steel formwork (10) of the lower layer is constructed and the soil core is backfilled, the thin steel formwork (10) of the upper layer is inserted into the backfilled soil core (12) of the lower layer for a certain depth along the inner wall of the thin steel formwork (10) of the lower layer, so that the thin steel formwork (10) of the upper layer is fixed, and the overlapping positions of the two thin steel formworks (10) are connected through thin steel formwork overlapping belts (11), so that the overlapping connection between the thin steel formworks (10) is achieved.

2. The manual hole digging annular foundation pile soil core backfill thin steel formwork system according to claim 1, characterized in that: digging holes in layers on a building foundation (13), constructing a manual digging pile retaining wall (4), pouring concrete (14) to seal the bottom after digging to the base, and backfilling soil cores in layers; mounting a thin steel template (10) by taking the backfilled soil core as a construction platform, firstly mounting expansion bolts (7), connecting reinforcing steel bars (8) and steel circular keels (9), and then mounting the thin steel template (10); the construction process comprises the steps of backfilling the soil core (12) layer by layer, constructing the steel circular ring keel (9) and constructing the thin steel template (10), circularly constructing, pouring concrete after the backfilling of the soil core reaches the designed elevation of the pile top, forming an annular pile body (6) after the concrete is solidified, and covering the capping cover plate (2).

3. The manual hole digging annular foundation pile soil core backfill thin steel formwork system according to claim 1, characterized in that: the thin steel template (10) is of a steel sheet structure.

4. A construction method for a soil core backfill thin steel template system of an annular foundation pile with a manual hole digging function comprises the following steps:

1) adopting manual hole digging to excavate layer by layer from the surface pile hole (1), constructing a manual hole digging pile protection arm (4) and a locking notch (3), excavating layer by layer to a substrate, and pouring concrete to seal the bottom;

2) integrally hoisting a reinforcement cage (5) and a pump pipe;

3) constructing a thin steel template keel at the bottom of the manual hole digging, wherein the construction comprises an expansion bolt (7), a connecting steel bar (8) and a steel circular keel (9), the expansion bolt (7) is arranged on the inner wall of the pile hole (1), the connecting steel bar (8) is welded on the expansion bolt (7), and the steel circular keel (9) is arranged on the connecting steel bar (8);

4) hoisting the thin steel template (10) to the inner wall of the steel circular keel (9), and rolling the thin steel template (10) on site to complete the construction of the thin steel template (10) of one layer of unit;

5) backfilling pile hole soil to the top of the thin steel template (10);

6) after the soil in the thin steel template (10) is backfilled, repeating the step 3) on the backfilled soil core (12) to complete the construction of the upper steel ring keel (9); the upper layer of thin steel formwork (10) is inserted into the lower layer of backfill soil core (12) along the inner wall of the lower layer of thin steel formwork (10) for a certain depth, so that the upper layer of thin steel formwork (10) is fixed, and the overlapped parts of the two layers of thin steel formworks (10) are connected by adopting thin steel formwork overlapping belts (11), so that the overlapping connection between the thin steel formworks (10) is realized;

7) repeating the steps 4), 5) and 6) until the pile top is designed to be high, and connecting the thin steel templates (10) in a lap joint mode;

8) lifting the pump pipe to pour the pile body concrete of the manual hole digging pile to form an annular pile body (6);

9) and (5) maintaining, namely adding a top-sealing cover plate (2) after the concrete reaches the strength.

Technical Field

The invention belongs to the technical field of civil engineering construction, and is mainly used for the construction of large-diameter (more than 2000mm) manual hole digging annular foundation pile templates.

Background

Along with the rapid development of the society, super high-rise buildings and large-span bridges are more and more, the requirements on the foundation are higher and higher, some large-diameter manual hole digging piles are produced in the background of the engineering construction, in the existing engineering pile foundation, the manual hole digging solid piles occupy a large proportion, the hollow piles are less in application, in the engineering practice, the manual hole digging hollow piles are usually constructed by adopting the procedures of manually digging holes and placing a reinforcement cage, then adopting lifting equipment to support a template and then pouring concrete.

The main technical problems encountered in the actual engineering are:

(1) the manual hole digging hollow pile template support needs to be constructed by adopting lifting equipment, a worker operation platform is narrow, the construction difficulty is high, and the construction process is complicated.

(2) When concrete is poured into the manual hole digging hollow pile, the formwork is easy to bend under the pressure action of the concrete, and adverse phenomena such as formwork expansion, grout leakage and grout leakage occur, so that the pile forming quality is influenced.

Disclosure of Invention

The invention mainly solves the following technical problems: adopt soil core backfill thin steel template system to construct and solved the problem that traditional manual hole digging hollow pile need adopt jacking equipment to carry out the template and prop up and establish, carry out thin steel template through backfilling soil core and prop up and establish, the operation platform is broad, and the efficiency of construction is higher to optimized the construction process, reduced construction cost. The soil core is used as an important component of the template system, and the inner wall of the template is more orderly, smooth and regular due to the existence of the soil core and the soil pressure when the concrete is poured, so that the adverse phenomena of template mold expansion, slurry leakage and the like are effectively prevented, and the pile forming quality of the annular foundation pile is greatly improved.

The invention discloses a soil core backfill thin steel template system of an annular foundation pile with a manual hole digging function, wherein a connecting steel bar 8 is connected with a steel circular keel 9 in a welding mode; the thin steel formworks 10 of each layer are connected in a lap joint mode, after the thin steel formwork 10 of the lower layer is constructed and the soil core is backfilled, the thin steel formwork 10 of the upper layer is inserted into the backfilled soil core 12 of the lower layer for a certain depth along the inner wall of the thin steel formwork 10 of the lower layer, so that the thin steel formwork 10 of the upper layer is fixed, and the overlapping positions of the two thin steel formworks 10 are connected through thin steel formwork lap joints 11, so that the lap joint connection between the thin steel formworks 10 is realized.

Further, digging holes in layers on the building foundation 13, constructing a manual digging pile protection arm 4, pouring concrete 14 to seal the bottom after digging to the base, and then backfilling the soil core in layers; mounting the thin steel template 10 by taking the backfilled soil core as a construction platform, firstly mounting the expansion bolts 7, the connecting steel bars 8 and the steel circular ring keels 9, and then mounting the thin steel template 10; the construction process comprises the steps of backfilling a soil core 12 layer by layer, constructing a steel circular ring keel 9 and constructing a thin steel template 10, wherein the construction process is circulated, after the backfilling soil core reaches the designed elevation of the pile top, pouring concrete, after the concrete is solidified, forming an annular pile body 6 and covering a capping cover plate 2, so that the purposes of construction process, efficiency improvement, pile forming quality guarantee and cost reduction are achieved.

Further, the thin steel template 10 is of a steel sheet structure and has a thickness of 0.8 mm.

Compared with the prior art, the construction technology of the local hole space soil core backfilling platform is adopted, the problem that a lifting device needs to be adopted to support the template of the large-diameter manual hole digging hollow pile is solved, the soil core backfilling is carried out in the thin steel template in order to increase the construction operation platform of workers in the local hole space and reduce the cost, and the backfilled soil core is used as a construction platform for installing the upper thin steel template. In addition, a multi-ring combined close-fitting technology is adopted, the thin steel template is tightly fitted with the steel ring keel due to the existence of the soil core through soil core backfilling when concrete is poured, so that the thin steel template is effectively prevented from buckling, the inner wall of the thin steel template is more tidy, flat and regular, the template is effectively prevented from expanding, leaking and leaking when the concrete is poured into the pile body, and the pile forming quality is improved.

Drawings

FIG. 1 is a schematic longitudinal section of a manual hole digging pile of a soil core backfilling thin steel template system.

FIG. 2 is a cross-sectional view of a steel ring keel A-A of an artificial hole digging pile of a soil core backfill thin steel template system.

FIG. 3 is a B-B section view of a thin steel template of an artificial bored pile of a soil core backfilling thin steel template system.

Fig. 4 is a plan view of a manual hole digging pile of a soil core backfilling thin steel template system.

In the figure: 1. pile holes; 2. capping the cover plate; 3. locking the opening; 4. manually digging a pile protection arm; 5. a reinforcement cage; 6. an annular pile body; 7. an expansion bolt; 8. connecting reinforcing steel bars; 9. a steel ring keel; 10. thin steel templates; 11. a thin steel template lap belt; 12. backfilling the soil core; 13. building a foundation; 14. and (5) sealing the bottom concrete.

Detailed Description

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

A construction method for a soil core backfill thin steel template system of an annular foundation pile with a manual hole digging function comprises the following steps:

1) and (3) carrying out layered excavation from the ground surface pile hole 1 by adopting manual hole excavation, constructing a manual hole excavation pile protection arm 4 and a locking notch 3, carrying out layered excavation to the substrate, and pouring concrete bottom sealing (the thickness of the bottom sealing is 0.4D).

2) The steel reinforcement cage 5 and the pump pipe are integrally hoisted.

3) And (3) carrying out thin steel formwork keel construction at the bottom of the manual hole digging, wherein the construction comprises expansion bolts 7, connecting steel bars 8 and steel ring keels 9, welding the expansion bolts 7 on the expansion bolts 7 according to the inner walls of the pile holes 1, and arranging the steel ring keels 9 on the connecting steel bars 8.

4) And (3) hoisting the thin steel template 10 to the inner wall of the steel circular keel 9, and rolling the thin steel template 10 on site to complete the construction of the thin steel template 10 of one layer of unit.

5) And backfilling pile hole soil to 5cm below the elevation of the top of the thin steel template 10.

6) After the soil in the thin steel template 10 is backfilled, repeating the step 3) on the backfilled soil core 12 to complete the construction of the upper steel ring keel 9; the upper layer of thin steel template 10 is inserted into the lower layer of backfill soil core 12 along the inner wall of the lower layer of thin steel template 10 for a certain depth, so that the upper layer of thin steel template 10 is fixed, and the overlapping part of the two layers of thin steel templates 10 is connected by adopting a thin steel template overlapping belt 11, so that the overlapping connection between the thin steel templates 10 is realized;

7) and (5) repeating the steps 4), 5) and 6) until the pile top is designed to be high, and connecting the thin steel templates 10 in a lap joint mode.

8) And lifting the pump pipe to pour the concrete of the pile body of the manual hole digging pile to form an annular pile body 6.

9) And (5) maintaining, namely adding a top-sealing cover plate 2 after the concrete reaches the strength.