A simple reaction pile used in static load test of pile foundation in green construction

Abstract

The utility model relates to the technical field of reaction pile structure, and specifically, to a simple reaction pile used in static load test of foundation piles in green construction. It includes a reaction pile hole, a steel pipe with a steel plate welded at the bottom is placed in the center of the reaction pile hole, and several layers of red bricks and sand are placed alternately from bottom to top in the reaction pile hole, until the sand covers the top opening of the reaction pile hole, and then the static load test can be carried out; after the test is completed, the sand, red bricks, steel pipes and steel plates in the reaction pile hole are all taken out, and the hole is filled. The utility model has a simple structure, fast installation, and convenient construction. It can be used as a reaction pile or anchor pile during foundation pile test, with low cost, no maintenance, and time saving; the reaction pile occupies a small construction site, does not need to be piled, avoids the risk of tilting and collapse of the reaction device, and achieves safety test while also improving work efficiency; the red bricks, steel plates and steel pipes can also be recycled and reused, which is energy-saving and environmentally friendly.

Description

Technical Field

[0001] The utility model relates to the technical field of reaction pile structures, in particular to a simple reaction pile used in a static load test of a foundation pile in green construction. Background Art

[0002] Pile foundation is the most widely used foundation form in China. my country uses more than 10 million piles every year. However, the number of construction units is huge and their technical levels are uneven. The quality of piles has always been the focus of attention of all parties involved in the construction. In addition to being affected by geotechnical engineering conditions, foundation and structural design, pile-soil interaction, construction technology, and professional level, the quality of pile foundation projects is also characterized by high concealment of construction and greater potential for quality risks. Therefore, pile bearing capacity testing is listed as a mandatory requirement. The single pile compressive static load test is recognized as the most intuitive and reliable traditional method for testing the vertical compressive bearing capacity of foundation piles. The reaction device for the static load test can be an anchor pile reaction device, a weighted platform reaction device, an anchor pile weighted combined reaction device, a ground anchor reaction device, etc.

[0003] The most commonly used method in engineering at present is the weighted platform loading method, but the loading method has its own shortcomings. For example, before the test begins, the weight of the pile is transferred from the supporting pier to the ground, which affects the soil around the pile to a certain extent. The greater the load, the deeper the impact depth. In addition, when testing large tonnage, if bagged sand or site soil is used as the pile, the upper load is large, resulting in a long installation time, and technical treatment is required to prevent bulging and collapse. If concrete prefabricated blocks are used for loading, the installation time can be reduced, but the transportation vehicles and cranes are required, the test cost is high, and the loading method test occupies a large area. The anchor pile reaction device has the advantage of quick installation, but the establishment of special concrete anchor piles will greatly increase the relevant costs.

[0004] In addition, with the rise of the green construction concept, higher requirements have been put forward for the construction process of various projects. In order to maximize resource conservation and reduce construction activities with negative impact on the environment through scientific management and technological progress while ensuring basic requirements such as quality and safety, and to achieve four savings and one environmental protection, the simple reaction force device in this technical solution came into being under such circumstances. The use of this reaction force device is quick to install without increasing too much cost, and at the same time avoids many safety risks. Utility Model Content

[0005] The purpose of the utility model is to provide a simple reaction pile used in static load tests of pile foundations in green construction. When static load tests are performed on pile foundation projects, the simple reaction pile can be quickly installed and conveniently constructed to avoid the risk of device collapse. At the same time, the static load test can be completed at the fastest speed without increasing too much cost, thereby achieving safety tests and improving work efficiency, so as to solve the problems raised in the above-mentioned background technology.

[0006] In order to solve the above technical problems, the purpose of the utility model is to provide a simple reaction pile used in static load test of foundation piles in green construction, including a reaction pile hole opened on the ground, a steel pipe with a steel plate welded at the bottom is placed in the center of the reaction pile hole, and several layers of red bricks and sand are placed alternately from bottom to top in the reaction pile hole around the outside of the steel pipe until the sand covers the top hole of the reaction pile hole for static load test; after the static load test is completed, the sand, red bricks, steel pipe and steel plate in the reaction pile hole are all taken out in turn, and the hole of the reaction pile hole is filled.

[0007] As a further improvement of the technical solution, the reaction pile holes are drilled by a pile driver through dry operation, and the depth of the reaction pile holes is 8 to 10 meters.

[0008] As a further improvement of the technical solution, the length of the steel pipe is greater than the depth of the reaction pile hole, and the outer wall of the steel pipe is sprayed with an injection molding layer and an anti-rust layer.

[0009] As a further improvement of the present technical solution, the steel plate is circular in shape, the outer diameter of the steel plate is less than or equal to the diameter of the reaction pile hole, the bottom end of the steel pipe is welded to the center of the top surface of the steel plate to form a whole; the outer surface of the steel plate is sprayed with an injection molding layer and an anti-rust layer.

[0010] As a further improvement of the technical solution, the red bricks are commonly used masonry materials in construction; the red bricks are placed obliquely into the reaction pile holes, with the oblique lower ends of the red bricks close to the outer wall of the steel pipe and the oblique upper ends close to the inner wall of the reaction pile holes.

[0011] As a further improvement of the technical solution, at least three red bricks are placed in each layer in an elevation plane in the reaction pile hole, and the red bricks in the same layer are distributed radially with equal angles, and the angle between two adjacent red bricks is less than or equal to 120°.

[0012] As a further improvement of the present technical solution, the sand is medium-coarse sand, and the particle size of the sand ranges from 0.25 mm to 2 mm.

[0013] As a further improvement of the technical solution, the sand is poured into the reaction pile hole to cover the adjacent bottom layer of red bricks, and the sand between two adjacent layers of red bricks is spread to a thickness of 150mm to 250mm; the sand laid near the top opening of the reaction pile hole is 450mm to 600mm thick until it is flush with the end face of the opening.

[0014] As a further improvement of the technical solution, after the static load test of the foundation pile is completed, the sand at the top hole of the reaction pile hole is first taken out from the hole, and the red bricks are clamped out one by one using pliers, and the operations of taking out the sand and clamping the red bricks are performed in sequence until all are taken out, and finally the steel pipe is taken out together with the steel plate.

[0015] As a further improvement of the technical solution, after the interior of the reaction pile hole is completely hollowed out, the reaction pile hole is filled with sand backfill or grouting.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] 1. The simple reaction pile used in the static load test of pile foundation in this green construction has a simple structure, reasonable construction, fast installation, strong applicability and convenient construction. It can be used as a reaction pile or anchor pile in the pile foundation test. The pile body material is ordinary building raw materials and the cost is low. The pile body does not need to be maintained, which saves construction time; the reaction pile has a simple structure, occupies a small construction site, does not need to be piled, and avoids the risks of tilting and collapse of the reaction device. At the same time, the cost is low, and the static load test is completed at the fastest speed, achieving safety test while also improving work efficiency;

[0018] 2. In the simple reaction piles used in the static load test of the foundation pile in this green construction, the red bricks, steel plates and steel pipes can be recycled and reused after the pile test is completed. The recycling rate is high, energy saving and environmental protection are achieved, and costs are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 For this utility model Figure 1 Schematic diagram of the top view of the structure of the middle BB section;

[0021] Figure 3 This is a schematic diagram of an exemplary method for pile testing in the present utility model;

[0022] Figure 4 It is a schematic diagram of the plane layout used for pile testing in the utility model.

[0023] In the figure:

[0024] 1. Reaction pile hole; 2. Steel pipe; 3. Steel plate; 4. Red brick; 5. Sand; 6. Test pile; 61. Pile cap; 611. Settlement observation point; 7. Jack; 71. Pressure pipe; 8. Main beam; 9. Secondary beam; A. Ground. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] Example 1

[0027] like Figure 1-Figure 2 As shown, the present embodiment provides a simple reaction pile used in the static load test of foundation piles in green construction, including a reaction pile hole 1 opened on the ground A, a steel pipe 2 with a steel plate 3 welded at the bottom is placed in the center of the reaction pile hole 1, and a plurality of layers of red bricks 4 and sand 5 are alternately placed from bottom to top around the outside of the steel pipe 2 in the reaction pile hole 1, until the sand 5 covers the top hole of the reaction pile hole 1, and then the static load test can be carried out; after the static load test is completed, the sand 5, red bricks 4, steel pipe 2 and steel plate 3 in the reaction pile hole 1 are all taken out in turn, and the hole of the reaction pile hole 1 is filled.

[0028] In this embodiment, the reaction pile hole 1 is drilled by a pile driver through dry operation. The diameter of the reaction pile hole 1 is preferably 500 mm, and the hole depth is 8 to 10 m.

[0029] In this embodiment, the length of the steel pipe 2 is greater than the depth of the reaction pile hole 1. The steel pipe 2 preferably has a diameter of 102 mm and a wall thickness of 3.5 mm. The outer wall of the steel pipe 2 is sprayed with an injection molding layer and an anti-rust layer.

[0030] Furthermore, the plate thickness of the steel plate 3 is preferably 14 mm, and it is processed into a circular shape with a diameter of 450 mm. The outer diameter of the steel plate 3 is less than or equal to the aperture of the reaction pile hole 1. The bottom end of the steel pipe 2 is welded to the center of the top surface of the steel plate 3 to form a whole; the outer surface of the steel plate 3 is sprayed with an injection molding layer and an anti-rust layer.

[0031] In this embodiment, the red brick 4 is a masonry material commonly used in construction, and the specifications of the red brick are 240mm×115mm×53mm; the red brick 4 is placed obliquely in the reaction pile hole 1, and the oblique lower end of the red brick 4 is close to the outer wall of the steel pipe 2, and the oblique upper end is close to the inner wall of the reaction pile hole 1.

[0032] Furthermore, at least three red bricks 4 are placed in each layer in an elevation plane in the reaction pile hole 1, and the red bricks 4 in the same layer are distributed at radial equal angles, and the angle between two adjacent red bricks 4 is less than or equal to 120°.

[0033] In this embodiment, the sand 5 is medium-coarse sand, the fineness modulus of the sand 5 is about 3.0, and the particle size ranges from 0.25 mm to 2 mm.

[0034] Furthermore, sand 5 is poured into the reaction pile hole 1 to cover the adjacent bottom layer of red bricks 4, and the sand 5 between two adjacent layers of red bricks 4 is spread to a thickness of about 200 mm; the sand 5 laid near the top opening of the reaction pile hole 1 is about 500 mm thick until it is flush with the end surface of the opening.

[0035] In this embodiment, after the static load test of the foundation pile is completed, the sand 5 at the top opening of the reaction pile hole 1 is first taken out from the opening, and the red bricks 4 are clamped out one by one using pliers, and the operations of taking out the sand 5 and clamping the red bricks 4 are performed in sequence until all are taken out, and finally the steel pipe 2 is taken out together with the steel plate 3.

[0036] Specifically, after the interior of the reaction pile hole 1 is completely hollowed out, the reaction pile hole 1 is backfilled with sand 5 or filled with grouting.

[0037] In summary, the utility model has a simple structure, reasonable construction, fast installation, and convenient construction. It avoids the risks of tilting and collapse of the reaction device, and has a low cost. It completes the static load test at the fastest speed, achieves safety test, and improves work efficiency. After the pile test is completed, the utility model can recycle red bricks, steel plates, and steel pipes, with a high recycling rate, energy saving, environmental protection, and cost reduction.

[0038] like Figure 3-Figure 4 As shown, the steps for using the simple reaction piles used in the static load test of the pile foundation in the green construction of the utility model include the following:

[0039] S1. Before using the simple reaction piles used in the static load test of the foundation piles in the green construction, the inspection personnel must first determine the position and arrangement of the reaction piles according to the position of the test piles 6. The arrangement can be four, six, or eight;

[0040] The specific arrangement of the test pile 6 is as follows: the portion of the upper end of the test pile 6 extending out of the ground A is a pile cap 61, and a plurality of settlement observation points 611 located on the same horizontal plane are arranged near the top of the outer wall of the pile cap 61; a jack 7 is installed at the top of the pile cap 61, and a pressurizing pipe 71 for connecting to an external air compressor is arranged on one side of the jack 7; a plurality of main beams 8 are arranged radially and crosswise at the top of the jack 7, and secondary beams 9 are arranged vertically and crosswise on the top surfaces of both ends of each main beam 8, and at least one reaction pile is linearly distributed below the secondary beam 9, and at least one reaction pile is located at the center of the intersection of the secondary beam 9 and the main beam 8, and a plurality of reaction piles are evenly distributed around the outside of the test pile 6;

[0041] S2. Determine the position of the reaction pile, and use mechanical drilling to drill a reaction pile hole 1, the depth of the reaction pile hole 1 is 8m to 10m;

[0042] S3, after the reaction pile hole 1 is formed, a circular steel plate 3 and a steel pipe 2 are placed in the hole to form an integral component by welding;

[0043] S4, place the red brick 4 obliquely into the reaction pile hole 1, with one end of the red brick 4 close to the outer wall of the steel pipe 2, and the other end close to the inner wall of the reaction pile hole 1, and place three red bricks in each elevation plane, with the angle between two adjacent red bricks 4 being 120°;

[0044] S5, pour sand 5 into the reaction pile hole 1, cover the red brick 4, and the thickness of each layer of sand 5 is 200mm;

[0045] S6, continue to put in the second layer of red bricks 4, the placement method is the same as step S4;

[0046] S7, continue to pour in the second batch of sand 5;

[0047] S8, looping steps S4-S7 until the opening of the reaction pile hole 1 is reached; laying sand 5 about 500 mm thick near the opening of the reaction pile hole 1 until the opening;

[0048] S9. The reaction pile construction is completed and the trial pile test begins.

[0049] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A simple reaction pile used in a pile static load test in green construction, characterized in that: The invention comprises a reaction pile hole (1) opened on the ground (A), a steel pipe (2) with a steel plate (3) welded at the bottom is placed in the center of the reaction pile hole (1), and a plurality of layers of red bricks (4) and sand (5) are alternately placed from bottom to top around the outer side of the steel pipe (2) in the reaction pile hole (1), until the sand (5) covers the top opening of the reaction pile hole (1), and then a static load test can be carried out; after the static load test is completed, the sand (5), red bricks (4), steel pipe (2) and steel plate (3) in the reaction pile hole (1) are all taken out in turn, and the hole of the reaction pile hole (1) is filled.

2. The simple reaction pile used in the static load test of pile foundation in green construction according to claim 1, characterized in that: The reaction pile hole (1) is drilled by a pile driver through dry operation, and the depth of the reaction pile hole (1) is 8 to 10 m.

3. The simple reaction pile used in the static load test of pile foundation in green construction according to claim 1, characterized in that: The length of the steel pipe (2) is greater than the depth of the reaction pile hole (1), and the outer wall of the steel pipe (2) is sprayed with an injection molding layer and an anti-rust layer.

4. The simple reaction pile used in the static load test of pile foundation in green construction according to claim 1, characterized in that: The steel plate (3) is circular in shape, the outer diameter of the steel plate (3) is less than or equal to the diameter of the reaction pile hole (1), the bottom end of the steel pipe (2) is welded to the center of the top surface of the steel plate (3); the outer surface of the steel plate (3) is sprayed with an injection molding layer and an anti-rust layer.

5. The simple reaction pile used in the static load test of pile foundation in green construction according to claim 1, characterized in that: The red brick (4) is a masonry material commonly used in construction; the red brick (4) is placed obliquely in the reaction pile hole (1), with the oblique lower end of the red brick (4) close to the outer wall of the steel pipe (2) and the oblique upper end close to the inner wall of the reaction pile hole (1).

6. The simple reaction pile used in the static load test of pile foundation in green construction according to claim 5, characterized in that: At least three red bricks (4) are placed in each layer in an elevation plane in the reaction pile hole (1), and a plurality of the red bricks (4) in the same layer are radially distributed with equal included angles, and the included angle between two adjacent red bricks (4) is less than or equal to 120°.

7. The simple reaction pile used in the static load test of pile foundation in green construction according to claim 1, characterized in that: The sand (5) is medium-coarse sand, and the particle size of the sand (5) ranges from 0.25 mm to 2 mm.

8. The simple reaction pile used in the static load test of pile foundation in green construction according to claim 7, characterized in that: The sand (5) is poured into the reaction pile hole (1) to cover the adjacent bottom layer of red bricks (4), and the sand (5) between two adjacent layers of red bricks (4) is spread to a thickness of 150 mm to 250 mm; the sand (5) spread near the top opening of the reaction pile hole (1) is 450 mm to 600 mm thick until it is flush with the end surface of the opening.

9. The simple reaction pile used in the static load test of pile foundation in green construction according to claim 1, characterized in that: After the static load test of the foundation pile is completed, the sand (5) at the top opening of the reaction pile hole (1) is first taken out from the opening, and the red bricks (4) are clamped out one by one using a clamp, and the operations of taking out the sand (5) and clamping the red bricks (4) are performed in sequence until all are taken out, and finally the steel pipe (2) is taken out together with the steel plate (3).

10. The simple reaction pile used in the static load test of pile foundation in green construction according to claim 9, characterized in that: After the interior of the reaction pile hole (1) is completely hollowed out, sand (5) is used to backfill or grout the reaction pile hole (1).

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