Construction method of along-track rod hammer stone breaking compaction pile manufactured by using site original soil and stone

Abstract

The invention relates to the technical field of compaction pile construction, and discloses a construction method of an along-track bar hammer stone breaking compaction pile made of site original soil and stones, which is characterized by comprising the following steps: S1, foundation treatment is carried out; s2, a foundation pile is formed; s3, a composite foundation is formed; and S4, manufacturing a mattress layer, and coordinating settlement difference. According to the construction method disclosed by the invention, the hammer body can be used for completing the construction of all working procedures of trepanning and pile forming of the pile body (trepanning, stone breaking, soil squeezing, hole forming, chambering and pile end bearing layer manufacturing; the combined action of one hammer with multiple purposes, one machine with multiple purposes and one method with multiple purposes is achieved, the combined hammer can adapt to various different geological conditions and the design requirements of different buildings and structures, and meanwhile various miscellaneous fill rocks existing on the site can be converted into various miscellaneous fill rocks. Various effects (original soil and stone bodies, a dynamic consolidation construction method, pile bodies with different strengths, soil bodies among the piles and the like) formed after treatment are combined together to form a raft-shaped high-strength foundation bearing layer.

Description

Technical Field

[0001] The present invention relates to the technical field of compaction pile construction, and particularly to a construction method for a track-aligned rod hammer stone-breaking compaction pile made of the original soil and stone on the site. Background Art

[0002] 1. Construction land is becoming increasingly tense;

[0003] 2. Digging mountains to fill valleys and reclaiming land from the sea have become common phenomena;

[0004] 3. The main materials for such valley filling and land reclamation from the sea are bound to consist of components such as soil, stone, or soil with stones or stones with soil;

[0005] 4. The sites backfilled with such components must be specially treated before they can be used as construction land;

[0006] 5. The treatment is very difficult. That is, it is necessary to improve the density of the thick and loose fill soil and avoid the boulders (isolated stones) in it, which brings trouble to the driving of the pile body (sometimes it must be cleared before the pile can be driven smoothly);

[0007] 6. The market urgently needs a construction method that can "make use of local materials and comprehensively utilize" them, which can achieve the comprehensive social effects of saving materials and energy, reducing costs, improving work efficiency, and being low-carbon and environmentally friendly.

[0008] In view of this, we propose a construction method for a track-aligned rod hammer stone-breaking compaction pile made of the original soil and stone on the site. Summary of the Invention

[0009] The technical problem to be solved by the present invention is to provide a construction method for a track-aligned rod hammer stone-breaking compaction pile made of the original soil and stone on the site.

[0010] To solve the above technical problem, the technical solution of the present invention is as follows:

[0011] A construction method for a track-aligned rod hammer stone-breaking compaction pile made of the original soil and stone on the site, characterized in that it includes the following steps:

[0012] S1. Conduct "foundation treatment": It is possible to conduct "foundation treatment" on the thick and complex-component loose fill soil with high difficulty. First, conduct the first compaction, and then conduct the second compaction to increase the density and strength to meet the design requirements for foundation bearing capacity and stability;

[0013] S2. Form "base piles": It is possible to form holes under various complex geological conditions (after compaction, the pile body retaining wall is formed to form the "confining pressure circle" of the pile body), and conduct separate pile body construction (after adding the corresponding pile body materials or the soil and stone materials on the site as replacement materials) to form independent "discrete material base piles" with various different bearing capacities and meeting the settlement requirements, so as to meet the design requirements for the single-pile bearing capacity of the pile body in different projects;

[0014] S3. Form a "composite foundation": According to the requirements of complex working conditions or the upper building (structure), it can be constructed into a "high-strength composite foundation" by combining, that is, organically combining different load-bearing forms of "foundation treatment" and "cast-in-place piles" (pile body + pile hole retaining wall, i.e., confining ring + soil compacted around the pile + soil affected by compaction between piles and tamped), to form a composite foundation treatment method with better technical and economic effects.

[0015] S4. Manufacture a cushion layer to coordinate settlement differences: After the above processes are completed, conduct a comprehensive evaluation of the treatment site, and then take the following measures separately or simultaneously:

[0016] ① Excavate the hard base layer;

[0017] ② Adopt the principle of dynamic consolidation to form a shallow flexible hard crust layer;

[0018] ③ Manufacture the base cushion layer;

[0019] ④ Comprehensive effect: Through the above methods, various complex miscellaneous fill foundations can be transformed into good building foundations, and the settlement differences generated after loading can be reduced or eliminated, ensuring the uniformity of foundation strength and the safety and stability of buildings.

[0020] Preferably, in S1, the first compaction operation is to repeatedly impact and form holes from top to bottom to compact the soil and rock between piles outside the pile holes.

[0021] Preferably, in S1, the second compaction operation is to backfill the soil and rock of the site in sections from bottom to top as replacement materials, compact them in sections, and repeat.

[0022] Preferably, the method of excavating the hard base layer in S4 is that when there is too large a difference in foundation strength in the site (bedrock outcrops in individual areas), it can be overexcavated by a certain section (the overexcavation depth is about 0.5 - 1 times the foundation width), and then backfilled with the same type of soil in the site and subjected to general and full compaction treatment to form an artificially manufactured "treatment buffer layer" to coordinate the too large strength difference between soft and hard foundation soils and achieve a synergistic settlement effect.

[0023] Preferably, the method of forming a shallow flexible hard crust layer in S4 is: for other sites to be treated, uniformly use the same tamping energy to conduct a full-field tamping once to promote it to form a whole treated plane and form a flexible hard crust layer formed by dynamic tamping at the lower part of the foundation, so as to strengthen the strength of the soil between piles (piers), reduce the pile-soil stress ratio and strength difference within the treated range.

[0024] Preferably, the method for manufacturing the base cushion layer in S4 is to lay a layer of graded sand and gravel after the above treatment to form a granular material cushion layer, coordinating the strength differences between different positions (excavation areas, filling areas) and different carriers (pile bodies, pile surrounding compression rings, soil bodies compacted between piles) to achieve the purpose of joint working.

[0025] Preferably, the form of the base piles in S2 is flat-head compaction piles and pile-bottom enlarged compaction piles.

[0026] Beneficial effects:

[0027] 1. The construction method of the present invention can adapt to various different geological conditions without being limited by geological conditions;

[0028] 2. All construction procedures of pile body hole opening and pile forming (hole opening, rock breaking, soil extrusion, hole forming, hole enlargement, manufacturing pile tip bearing layer) can be completed by one type of hammer body;

[0029] 3. It achieves the comprehensive effects of multi-purpose use of one hammer, multi-purpose use of one machine, and multi-purpose use of one method, and can adapt to various different geological conditions and the design requirements of different buildings and structures. At the same time, various miscellaneous filled soil and rock masses on site can be combined after treatment to form various effects (original soil and rock masses + dynamic consolidation construction method + pile bodies and soil bodies between piles with different strengths, etc.) to form a raft-shaped high-strength foundation bearing layer. Brief description of the drawings

[0030] Figure 1 is a flow chart of the construction method of the present invention;

[0031] Figure 2 is a construction procedure diagram of the flat-head compaction replacement pile in the present invention;

[0032] Figure 3 is a construction procedure diagram of the pile-bottom enlarged compaction replacement pile in the present invention;

[0033] Figure 4 is a plan layout diagram of the composite foundation in the present invention;

[0034] Figure 5 In the present invention Figure 4 is the A-A cross-sectional view;

[0035] Figure 6 is a schematic diagram of the influence of full tamping construction in the present invention;

[0036] Figure 7 is an elevation schematic diagram of the flexible full tamping sand and gravel cushion adjustment layer in the present invention. Specific embodiments

[0037] The following further describes the specific embodiments of the present invention. It should be noted here that the description of these embodiments is used to help understand the present invention, but does not limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0038] Provide a general but clear description of the core technical problem to be solved by this application, the technical solution used to solve the core technical problem, and the achievable technical effect.

[0039] As Figure 1-7 shown:

[0040] The construction method of the track-aligned rammer stone-compacting pile made of the original soil and rock on the site provided by the present invention is characterized by including the following steps:

[0041] S1. Conduct "foundation treatment": It is possible to conduct "foundation treatment" on highly difficult loose fill with large thickness and complex composition. First, conduct the first compaction, and then conduct the second compaction to increase the density and strength to meet the design requirements for foundation bearing capacity and stability.

[0042] S2. Form "foundation piles": It is possible to form holes under various complex geological conditions (after compaction, the pile body retaining wall is formed, that is, the "confining pressure circle" of the pile body), and conduct separate pile body construction (after adding the corresponding pile body materials or site soil and stone materials as replacement materials) to form independent "dispersed material foundation piles" with different bearing capacities and meeting the settlement requirements to meet the design requirements for the single-pile bearing capacity of the pile body in different projects.

[0043] S3. Form "composite foundation": It is possible to combine and construct a "high-strength composite foundation" according to the requirements of complex working conditions or the upper building (structure), that is: organically combine different load-bearing body types of "foundation treatment" and "foundation piles" (pile body + pile hole retaining wall, that is, the confining pressure circle + pile side compacted body + soil body affected and compacted by pile spacing) to form a composite foundation treatment method with better technical and economic effects.

[0044] S4. Manufacture the cushion layer to coordinate settlement differences: After the above processes are completed, conduct a comprehensive evaluation of the treatment site, and then take the following measures separately or simultaneously:

[0045] ① Excavate the hard base layer;

[0046] ② Adopt the principle of dynamic consolidation to form a shallow flexible hard shell layer;

[0047] ③ Manufacture the base cushion layer;

[0048] ④Comprehensive effect: Through the above methods, various complex filled soil foundations can be transformed into good building foundations, and the settlement difference generated after loading can be reduced or eliminated, ensuring the uniformity of foundation strength and the safety and stability of buildings.

[0049] In this embodiment, in S1, the first compaction operation is to repeatedly impact and form holes from top to bottom to compact the soil and rock mass between the piles outside the compaction pile holes.

[0050] In this embodiment, in S1, the second compaction operation is to segmentally backfill the soil and rock mass of the site from bottom to top as replacement materials, segmentally tamp and compact them, and repeat the process.

[0051] In this embodiment, the pile types in S2 are flat-head compaction piles and bottom-expanded compaction piles.

[0052] As Figure 2 shown, the flat-head compaction pile uses a track-mounted rod hammer to repeatedly impact and form holes to the bottom elevation of the pile, repeatedly impact and compact the soil layer at the pile end to form a hard shell bearing layer, and at the same time form a vertical pile hole or tamping pit. Then, segmentally backfill, replace, tamp, and evenly expand the soil and stone materials from bottom to top until the ground (or pile top) elevation is reached, forming a soil and stone compaction pile body (this method is applicable to sites with higher-strength soil layers such as hard plastic soil or dense sand and gravel as the pile-end bearing layer).

[0053] As Figure 3 shown, the bottom-expanded compaction pile uses a track-mounted rod hammer to repeatedly impact and form holes to the bottom elevation of the pile, repeatedly impact and compact the soil layer at the pile end to form a hard shell bearing layer, and then backfill and replace the lower part of the pile body with replacement materials, and repeatedly and intensively tamp and expand to form an enlarged head (to make up for the deficiency of soil layer strength); then, segmentally backfill and replace the middle and upper parts with replacement materials, and evenly tamp and expand to form the pile body (this method is applicable to sites with lower-strength soil layers such as plastic or slightly dense, soft plastic or loose as the pile-end bearing layer).

[0054] In this embodiment, the method for excavating the hard base layer in S4 is that when there is a large difference in foundation strength in the site (bedrock outcrops in individual areas), it can be overexcavated by a certain section (the overexcavation depth is about 0.5 - 1 times the foundation width), and then backfilled with the same type of soil in the site and subjected to general and full tamping treatment to form an artificially created "treatment buffer layer" to coordinate the large strength difference between the soft and hard foundation soils and achieve the effect of coordinated settlement.

[0055] In this embodiment, the method for forming the shallow flexible hard shell layer in S4 is as follows: For other sites to be treated, uniformly perform one pass of full-field tamping with the same tamping energy to promote them to form a whole treated plane and form a flexible hard shell layer formed by dynamic tamping at the lower part of the foundation, so as to strengthen the strength of the soil between the piles (piers), reduce the pile-soil stress ratio and strength difference within the treated range.

[0056] In this embodiment, the method for manufacturing the base cushion layer in S4 is to lay a layer of graded sand and gravel after the above treatment to form a granular material cushion layer, so as to coordinate the strength differences between different positions (excavation areas, filling areas) and between different carriers (pile bodies, pile surrounding compression rings, soil bodies compacted between piles), and achieve the purpose of working together.

[0057] The above has described the embodiments of the present invention in detail, but the present invention is not limited to the described embodiments. For those skilled in the art, without departing from the principle and spirit of the present invention, various changes, modifications, substitutions, and variations made to these embodiments still fall within the protection scope of the present invention.

Claims

1. A construction method for a track-aligned rammer stone-compacting pile made of the original soil and stone on the site, characterized in that: It includes the following steps: S1. Conduct "foundation treatment": It is possible to conduct "foundation treatment" on highly difficult loose fill soil with large thickness and complex composition. First, conduct the first compaction, and then conduct the second compaction to increase the compactness and strength to meet the design requirements for foundation bearing capacity and stability. S2. Form "foundation piles": It is possible to form holes under various complex geological conditions (after compaction, the pile body retaining wall is formed, i.e., the "confining pressure circle" of the pile body), and conduct individual pile body construction (after adding corresponding pile body materials or on-site soil and stone materials as replacement materials) to form independent "dispersed material foundation piles" with different bearing capacities and meeting the settlement requirements to meet the design requirements for the single-pile bearing capacity of pile bodies in different projects. S3. Form "composite foundation": According to the requirements of complex working conditions or upper buildings (structures), it can be constructed into a "high-strength composite foundation" by combining different load-bearing body forms of "foundation treatment" and "foundation piles", that is, organically combining different load-bearing body forms of "foundation treatment" and "foundation piles" (pile body + pile hole retaining wall, i.e., confining pressure circle + soil mass compacted around the pile + soil mass affected by compaction and tamped between piles) to form a composite foundation treatment method with better technical and economic effects. S4. Manufacture a cushion layer to coordinate settlement differences: After the above processes are completed, conduct a comprehensive evaluation of the treatment site, and then take the following measures separately or simultaneously: ① Excavate the hard base layer; ② Adopt the principle of dynamic consolidation to form a shallow flexible hard shell layer; ③ Manufacture the base cushion layer; ④ Comprehensive effect: Through the above methods, various complex miscellaneous fill foundations can be transformed into good building foundations, and the settlement differences generated after loading can be reduced or eliminated, ensuring the uniformity of foundation strength and the safety and stability of buildings.

2. The construction method of the along-rail rod hammer stone-breaking and compaction pile made of the original soil and stone on the site according to claim 1, characterized in that: In the above S1, the first compaction operation is to repeatedly impact and form holes from top to bottom to compact the soil and stone bodies between the piles outside the pile holes.

3. The construction method of the along-rail rod hammer stone-crushing and compaction pile made of the original soil and stone on the site according to claim 1, characterized in that: In the above S1, the second compaction operation is to segmentally backfill the on-site soil and stone materials as replacement materials from bottom to top, segmentally tamp and compact them, and repeat the process.

4. The construction method of the along-track rod hammer stone-breaking and compaction pile made of the original soil and stone on the site according to claim 1, characterized in that: The method of excavating the hard base layer in the above S4 is that when there is a too large difference in foundation strength in the site (bedrock outcrops in individual areas), it can be overexcavated by a certain section (the overexcavation depth is about 0.5 - 1 times the foundation width), and then backfilled with the same type of soil in the site and subjected to general and full tamping treatment to form an artificially manufactured "treatment buffer layer" to coordinate the too large strength difference between soft and hard foundation soils and achieve the effect of coordinated settlement.

5. The construction method of a track-aligned rammer crusher compaction pile made of original soil and rock at the site according to claim 1, characterized in that: The method of forming a shallow flexible hard shell layer in the above S4 is: For other treated sites, uniformly use the same tamping energy to conduct a full-field full tamping once to make it form a treated plane as a whole and form a flexible hard shell layer formed by dynamic tamping under the foundation to strengthen the strength of the soil between the piles (piers), reduce the pile-soil stress ratio and strength difference within the treated range.

6. The construction method of the along-rail rod hammer stone-breaking and compaction pile made of the original soil and stone on the site according to claim 1, characterized in that: The method of manufacturing the base cushion layer in the above S4 is to lay a layer of graded sand and gravel after the above treatment to form a dispersed material cushion layer to coordinate the strength differences between different positions (excavation areas, filling areas) and different load-bearing bodies (pile bodies, pile confining pressure circles, soil masses compacted between piles) to achieve the purpose of working together.

7. The construction method of the along-track rod hammer stone-breaking and compaction pile made of the original soil and stone on the site according to claim 1, characterized in that: The pile forms of the foundation piles in the above S2 are flat-headed compaction piles and pile-bottom enlarged compaction piles.

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