Quasi large-diameter pile formed by bunching plurality of small-diameter piles and construction method of quasi large-diameter pile

A construction method and large-diameter technology, applied in sheet pile walls, foundation structure engineering, construction, etc., can solve problems such as restrictions, limited number of pile foundation construction machines, and difficult construction, so as to increase the scope of application and reduce construction difficulty , a wide range of effects

Active Publication Date: 2017-09-22
CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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AI-Extracted Technical Summary

Problems solved by technology

[0003]Large-diameter pile foundations are restricted by large-scale construction machinery. Generally, large-diameter rotary drilling rigs are equipped only in super-large projects, or are used when geological conditions are available. For manual excavation pile foundations, the number ...
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Method used

As shown in Figure 1, a kind of class large-diameter pile synthesized by many small pile bundles of the present invention comprises several identical foundation pile units 1, and the cross section of foundation pile unit 1 is circular, and is a reinforcement cage The cross section of 12 is circular or fan-shaped. The foundation pile unit 1 is a reinforced concrete structure, mostly with a circular cross section, consisting of a concrete body 11 and a built-in reinforcement cage 12. The reinforcement cage 12 can be a circular reinforcement cage 12a or a fan-shaped reinforcement according to the size of the occlusal groove 13 of the pile body. Cage 12b, on the basis of reinforcement cage 12, remove the reinforcing bars of foundation pile unit 1 in the pre-construction range within the occlusal section to form occlusal groove 13, preventing reinforcement cage 12 from pairing foundation pile unit 1 in later construction and foundation pile unit 1 in earlier construction Interference when occlusal.
One embodiment of the present invention provides a kind of large-diameter pile, is made up of many small-diameter foundation pile units 1, is divided into A group foundation pile unit 1A, B group foundation pile unit 1B, center according to construction order and position For foundation pile 1C, adjacent small-diameter foundation pile units 1 are engaged with each other, and pile jumping construction is performed at intervals during construction, that is, grou...
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Abstract

The invention discloses a quasi-large-diameter pile formed by bunching a plurality of small-diameter piles and a construction method of the quasi-large-diameter pile. The structure of the quasi-large-diameter pile comprises a plurality of foundation pile units with the same structures, wherein a group A of foundation pile units and a group B of foundation pile units are uniformly arranged at intervals to form the foundation pile unit, both the group A of foundation pile units and the group B of foundation pile units comprise concrete main bodies and steel bar cages, occluding grooves are formed in the outer sides of the steel bar cages, and the occluding grooves in the group A of foundation pile units and the group B of foundation pipe units adjacent to the group A of foundation pile units coincide. The quasi-large-diameter pile is formed by the plurality of small-diameter piles defining a bunch with a theoretical pile center as the circle center and mutually meshing with each other to form a whole. According to the construction method of the quasi-large-diameter pile, a conventional small-diameter pile construction process is completely adopted, high-power construction machinery investment is not needed, and therefore the advantages of the large-diameter pile are achieved, the construction difficulty is reduced, and the application range is enlarged; multiple pile foundations can be constructed at the same time without the restriction of the large construction machinery, and therefore the construction period of the pile foundations is greatly shortened, the engineering cost is saved, and the economic benefits are obvious.

Application Domain

Bulkheads/piles

Technology Topic

Steel barEconomic benefits +1

Image

  • Quasi large-diameter pile formed by bunching plurality of small-diameter piles and construction method of quasi large-diameter pile
  • Quasi large-diameter pile formed by bunching plurality of small-diameter piles and construction method of quasi large-diameter pile
  • Quasi large-diameter pile formed by bunching plurality of small-diameter piles and construction method of quasi large-diameter pile

Examples

  • Experimental program(1)

Example Embodiment

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments, but the embodiments should not be construed as limiting the present invention.
[0035] like figure 1 As shown in the figure, a kind of large-diameter pile synthesized by a plurality of small pile bundles of the present invention includes several foundation pile units 1 with the same structure. shape or sector. The foundation pile unit 1 is a reinforced concrete structure, mostly with a circular cross-section, and is composed of a concrete main body 11 and a built-in reinforcement cage 12. The reinforcement cage 12 can be a circular reinforcement cage 12a or a fan-shaped reinforcement according to the size of the occlusal groove 13 of the pile body. The cage 12b, on the basis of the reinforcement cage 12, removes the reinforcement of the pre-construction foundation pile unit 1 within the occlusal section to form an occlusion groove 13 to prevent the reinforcement cage 12 from affecting the post-construction foundation pile unit 1 and the pre-construction foundation pile unit 1 Interference during bite.
[0036] The foundation pile unit 1 is composed of a group A foundation pile unit 1A and a group B foundation pile unit 1B evenly spaced. The A group foundation pile unit 1A and the B group foundation pile unit 1B both include a concrete main body 11 and a reinforcement cage 12. The reinforcement cage 12 is provided outside. There are clinching grooves, and the clinching grooves 13 between the adjacent group A pile units 1A and B group pile units 1B overlap. The engaging groove 13 is a shuttle-shaped structure with sharp ends at both ends and wide in the middle. The width of the engaging groove 13 is about 1/10 to 3/10 of the width of the foundation pile unit 1 .
[0037] A central foundation pile 1C is provided in the middle of the A group foundation pile unit 1A and the B group foundation pile unit 1B. The central foundation pile 1C includes a concrete main body 11 and a reinforcing bar cage 12. The outside of the reinforcing bar cage 12 is provided with an occlusal groove 13. The central foundation pile 1C Coincidence with the occlusal grooves 13 between all adjacent group A pile units 1A and B group pile units 1B. In most cases, the number of foundation pile units of group A and group B is 3 respectively.
[0038] An embodiment of the present invention provides a quasi-large-diameter pile, which is composed of a plurality of small-diameter pile units 1, and is divided into a group A foundation pile unit 1A, a group B foundation pile unit 1B, and a central foundation pile 1C according to the construction sequence and location. , the adjacent small-diameter foundation pile units 1 are engaged with each other, and the construction is carried out at intervals of pile jumping construction, that is, the group A foundation pile unit 1A is constructed at intervals, and then the B group foundation pile unit 1B is constructed after the foundation pile unit 1A of the group A is solidified. , and make the foundation pile unit 1A of the group A and the foundation pile unit 1B of the group B bite together to form a continuous closed quasi-large-diameter pile. According to the needs, the construction center foundation pile 1C can be added to strengthen the pile body and improve the bearing capacity.
[0039] According to needs, when the large-diameter pile is a friction pile, the central foundation pile 1C may not be constructed to save the amount of concrete. Bearing capacity of large diameter piles. In order to further improve the bearing capacity of the pile body, a reinforced concrete center foundation pile with a reinforcement cage is sometimes used.
[0040] A construction method applied to the above-mentioned large-diameter piles synthesized by a plurality of small pile bundles, comprising the following steps:
[0041] 1) Construction of pile holes of group A foundation pile unit 1A, such as figure 2 shown. The pile holes of group A foundation pile unit 1A were constructed by conventional methods.
[0042] 2) Place the reinforcement cage 12 of group A foundation pile unit 1A, and put the filling rod 2 with the same shape as the occlusal groove 13 in the occlusal groove 13, such as image 3shown. The filling rod 2 is an elastomer structure, mostly a rubber rod. The shape of the filling rod 2 is a fusiform structure with a tip at both ends and a wide middle, such as Figure 4 shown. Due to the elastic properties of rubber, when the axis is stretched, due to the Poisson effect, it shrinks laterally, and is naturally separated from the poured foundation pile, which is convenient for removal; The outer side of the filler rod 2 is coated with a mold release agent, which reduces the adhesive force and facilitates removal. The filling rod 2 stiffens the steel wire along the axis to enhance the resistance strength of the rubber rod, and the rubber rod is placed and pulled out to break.
[0043] 3) Concrete is poured to form the concrete main body 11, and the construction of the foundation pile unit 1A of group A is completed, such as Figure 5 shown.
[0044] 4) When the concrete strength of group A foundation pile unit 1A reaches the initial setting level, generally 48h, about 2MPa, take out the filling rod 2, and form a reserved space in the occlusal groove 13, such as Image 6 shown.
[0045] 5) Construction of the pile holes of the group B foundation pile unit 1B; using the conventional method to construct the pile holes of the B group foundation pile unit 1B, since the occlusal groove 13 is a cavity, the construction is not affected.
[0046] 6) Place the reinforcement cage 12 of group B foundation pile unit 1B;
[0047] 7) Concrete is poured to form a concrete main body 11, and the overlapping occlusal groove 13 between the A group foundation pile unit 1A and the B group foundation pile unit 1B is poured with concrete, and the construction of the B group foundation pile unit 1B is completed, such as Figure 7 shown.
[0048] Several foundation pile units in group A foundation pile unit 1A are constructed at the same time or sequentially according to steps 1) to 3), and several foundation pile units in group B foundation pile unit 1B are constructed at the same time or in sequence according to steps 4) to 7). construction.
[0049] The above descriptions are only preferred embodiments of the present invention, and do not limit the structure of the present invention in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solutions of the present invention.

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