Reinforcing and repairing structure for building terrace foundation

Abstract

The utility model relates to a building terrace foundation reinforcing and repairing structure which comprises a threaded pile, a grouting steel pipe pile and a high polymer grouting body, the burial depth of the threaded pile is larger than that of the grouting steel pipe pile, the threaded pile is used for reinforcing a deep soil body, the grouting steel pipe pile is used for reinforcing a shallow soil layer, and the high polymer grouting body is arranged on the threaded pile. And the high polymer grouting body is arranged at the void gap position of the original building terrace. The utility model has the advantages that: 1) the deep and shallow layers can be reinforced and repaired at the same time, and the bearing capacity and deformation control capacity of the foundation can be exerted; (2) the deep soil body can be reinforced under the condition of a height-limited space, and the requirement for reinforcing terrace foundations of common warehouses and plants is met; compared with a traditional grouting method, polymer grouting can quickly repair the invalid composite foundation, damage to the original building terrace is small, and a new stress system is formed by the newly reinforced composite foundation and the building terrace, and compared with a terrace breaking scheme, the breaking workload is greatly reduced, resource waste is reduced, manpower and financial resources are reduced, and the construction period is greatly shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of foundation reinforcement, in particular to a reinforcement and repair structure for a building floor foundation. Background Art

[0002] With the reform and opening up and rapid economic development, especially the rapid development of e-commerce logistics economy, my country's modern logistics warehousing and warehouse construction have developed rapidly. By 2022, the national commercial general warehouse area has reached 1.05 billion square meters.

[0003] Modern logistics warehousing and warehouses are industrial real estate projects. In active economic circles such as the Yangtze River Delta, the Pearl River Delta, and the Beijing-Tianjin-Hebei region, due to the high cost of construction land, most warehouses are built in soft soil areas with poor soil conditions. In addition, due to the inconsistent standards and requirements for use during the original construction, the warehouse floor after foundation treatment has different settlement deformations or uneven settlement deformations during the use of the site, which affects the normal use of the building floor.

[0004] At present, various reinforcement technologies have been developed for foundation treatment, including the following:

[0005] The Engineering Geology Handbook, published by China Architecture & Building Press (2017), discloses that general soft soil foundation treatment includes replacement, dynamic tamping, vacuum preloading, drainage consolidation, deep mixing, high-pressure jet grouting or pile foundation, forming natural foundation, composite foundation or structural pile foundation, etc. The Technical Specification for Building Foundation Treatment, published by China Architecture & Building Press (2013), discloses that composite foundations include composite foundations with bulk material reinforcement and composite foundations with bonding strength reinforcement. Among them, composite foundations in soft soil areas are mainly composite foundations with bonding strength reinforcement, including composite foundations with cement-soil mixing piles, composite foundations with high-pressure jet grouting piles, composite foundations with micro steel pipe piles or prefabricated piles, etc.

[0006] However, this type of composite foundation building floor structure is often designed without considering the consolidation degree of soft soil, the consolidation deformation of soft soil caused by the covering soil load, and the change of use load. This leads to settlement of the composite foundation, separation of the composite foundation and the building floor, and settlement and cracking of the floor after a certain period of use, affecting the normal use of the building floor or the need to upgrade the warehouse to standard.

[0007] In case of composite foundation settlement and deformation leading to failure of the original composite foundation, settlement or cracking of the building floor, etc., which affect the normal use of the floor, it is often necessary to reinforce and repair the composite foundation and building floor to meet the normal use and operation of the warehouse building floor. Conventional building floor composite foundation reinforcement solutions are limited in net height and working space in the warehouse, and large machinery and equipment are difficult to enter the site, resulting in fewer feasible repair solutions and obvious advantages and disadvantages.

[0008] "Low Temperature Construction Technology" (2021) published an article titled "A Case Study on Settlement and Reinforcement of Soft Soil Foundation of a Logistics Warehouse in Shanghai". It uses the method of demolishing the floor and redoing it combined with high-pressure rotary jet piles to re-reinforce the floor foundation. Its advantages are reliable quality and simple solution, but its disadvantages are that it does not consider the original foundation treatment effect and the state of the foundation soil, it is time-consuming, labor-intensive, and expensive, and there is mud pollution.

[0009] "Mining Engineering" (2017) published an article titled "Analysis of the Causes of Indoor Floor Settlement in a Factory in Ningbo and Treatment Measures". It uses floor demolition combined with precast piles and beam-slab structure for floor foundation treatment. Its advantage is fast construction speed, but its disadvantages are limited working space for precast piles, inability to bring large equipment to the site, no consideration of the original foundation treatment effect and foundation soil status, high cost and long construction period. At the same time, its slurry solidifies slowly and shrinks during solidification, and the long-term effect is not obvious.

[0010] In addition, there is also a solution of using anchor static pressure piles for reinforcement in the prior art. Its advantages are that there is no drilling mud and the quality of the piles is guaranteed, but its disadvantages are that it cannot be connected with the original building floor, the floor punching cannot be guaranteed, the cost is high, and the construction period is long.

[0011] Therefore, how to reinforce and repair the foundation of the composite foundation of the building floor is an issue that still needs further in-depth research and discussion. Summary of the invention

[0012] The purpose of the utility model is to provide a reinforcement and repair structure for a building floor foundation in accordance with the above-mentioned deficiencies of the prior art, which makes full use of the original composite foundation treatment effect and takes into account the consolidation state of the composite foundation soil after settlement and deformation to respectively reinforce the composite foundation with threaded piles and grouting steel pipe piles in deep and shallow layers, and quickly and non-destructively repair the voids under the building floor with polymer grouting, thereby ultimately achieving the reinforcement and repair effect of the composite foundation and the building floor.

[0013] The purpose of this utility model is achieved by the following technical solutions:

[0014] A reinforcement and repair structure for a building floor foundation, characterized in that it comprises threaded piles, grouting steel pipe piles and polymer grouting bodies, wherein the buried depth of the threaded piles is greater than that of the grouting steel pipe piles, wherein the threaded piles are used for reinforcing deep soil layers, the grouting steel pipe piles are used for reinforcing shallow soil layers, and the polymer grouting bodies are arranged at hollow gaps under the original building floor.

[0015] The threaded piles are constructed by drilling holes on the original building floor and using construction machinery. The connection position between the threaded piles and the original building floor is provided with a threaded pile head plate and backfilled with a graded crushed stone layer.

[0016] Steel bars are implanted in the original building floor opening positions of the threaded piles and concrete is poured to seal the holes.

[0017] The steel pipe pile is made by drilling a hole on the original building floor and pressing it in with a construction machine. After being pressed in, the steel pipe pile is grouting to form a grouting body on the periphery of the pile body.

[0018] The positions of the hollow gaps in the building floor foundation include the position between the original building floor and the graded crushed stone layer below it and the position between the graded crushed stone layer and the soil layer below it.

[0019] The threaded piles, the grouting steel pipe piles and the polymer grouting bodies are arranged in an array within the scope of the original building floor.

[0020] The polymer grouting bodies are arranged in an array around the threaded piles or the grouting steel pipe piles, and the grouting steel pipe piles are arranged in an array around each threaded pile.

[0021] The bottom of the threaded pile goes deep into the bearing layer, and the bottom of the grouting steel pipe pile goes deep into the soft soil layer under the backfill soil layer under the original building floor.

[0022] The advantages of the utility model are:

[0023] 1) It can realize the reinforcement and repair of deep and shallow layers at the same time and give full play to the bearing capacity and deformation control ability of the foundation;

[0024] 2) It can realize deep soil reinforcement under limited height space conditions and meet the requirements of general warehouse and factory floor foundation reinforcement;

[0025] 3) Compared with the traditional grouting method, polymer grouting can quickly repair the failed composite foundation and cause less damage to the original building floor, so that the newly reinforced composite foundation and the building floor form a new force system;

[0026] 4) Compared with the floor demolition plan, it greatly reduces the workload of demolition, reduces resource waste, reduces manpower and financial resources, and greatly shortens the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a cross-sectional schematic diagram of the utility model;

[0028] Figure 2 It is a schematic diagram of the arrangement of pile positions and grouting holes of the utility model;

[0029] Figure 3 It is a cross-sectional view of the original cement-soil mixing pile composite foundation of a warehouse building floor targeted by the embodiment of the utility model. DETAILED DESCRIPTION

[0030] The following is a further detailed description of the features of the present invention and other related features through embodiments in conjunction with the accompanying drawings to facilitate understanding by technicians in the same industry:

[0031] like Figure 1-3 As shown in the figure, marks 1-25 respectively represent: building floor design elevation 1, polymer grouting hole 2, threaded pile opening and sealing 3, building floor embedded reinforcement 4, graded crushed stone layer 5, threaded pile head plate 6, new cast surface layer 7, original building floor 8, polymer grouting body 9, graded crushed stone layer 10, steel pipe pile grouting body 11, original foundation reinforcement bonding pile 12, grouting steel pipe pile 13, threaded pile 14, backfill soil layer 15, soft soil layer 16, polymer grouting hole position 17, grouting steel pipe pile position 18, threaded pile position 19, original building floor 20, graded crushed stone layer 21, cement soil mixing pile 22, backfill soil layer 23, soft soil layer 1 24, soft soil layer 25.

[0032] Example: Figure 1 and Figure 2 As shown, the reinforcement and repair structure of the building floor foundation in this embodiment is used to reinforce the foundation of the original building floor. The original building floor foundation includes the original building floor 8, and a graded crushed stone layer 10 is arranged below the original building floor 8; the graded crushed stone layer 10 is arranged on the lower soil layer, and the lower soil layer includes a backfill soil layer 15 and a soft soil layer 16. Original foundation reinforcement bonding piles 12 are arranged in the foundation of the original building floor, and the foundation reinforcement is achieved by a plurality of original foundation reinforcement bonding piles 12. However, different settlement deformations or uneven settlement deformations occur in the original building floor during use, which affects the normal use of the building floor.

[0033] Based on this, the reinforcement and repair structure in this embodiment implements a reinforcement treatment technology that combines deep and shallow soil according to the consolidation state of the foundation soil after settlement and deformation, post-construction use requirements, etc., specifically including threaded piles 14 and grouting steel pipe piles 13, wherein the threaded piles 14 are used to reinforce the deep soil, with the pile bottom penetrating into the bearing layer below the soft soil layer 16, while the grouting steel pipe piles 13 are used to reinforce the shallow soil, with the pile bottom penetrating through the backfill soil layer 15 and penetrating into the soft soil layer 16.

[0034] Specifically, the threaded pile 14 is constructed by drilling holes on the original building floor 8 (threaded pile drilling and sealing holes 3), using special construction machinery, and after the construction is completed, the threaded pile head plate 6 is constructed, and the graded gravel layer 5 is backfilled. The building floor steel bars 4 are implanted at the threaded pile drilling and sealing holes 3, and concrete is poured to seal the holes to form a composite foundation force system. In this embodiment, the threaded pile 14 forms a pile-forming power by providing torque to the threaded pile with the pile foundation, and the height-restricted space of a general warehouse can meet the requirements of mechanical equipment operation. The grouting steel pipe pile 13 is pressed into the soil layer after drilling a hole on the original building floor 8, and then a steel pipe pile grouting body 11 is formed on the periphery of the steel pipe pile body by grouting. After completion, the hole position of the original building floor 8 is sealed with concrete to form a grouting steel pipe pile composite foundation.

[0035] In this embodiment, the deep and shallow soil layers under the original building floor 8 are reinforced and repaired at the same time by using the threaded piles 14 and the grouting steel pipe piles 13, and the bearing capacity and deformation control capacity of the foundation are brought into play.

[0036] like Figure 1 As shown, there are hollowing, hollowing, gaps and the like in the original building floor foundation due to the settlement of the composite foundation. In this embodiment, a polymer grouting hole 2 is opened on the original building floor 8, and the polymer grouting hole 2 corresponds to the location where hollowing and hollowing occur. By injecting polymer into the polymer grouting hole 2, a polymer grouting body 9 is formed at the hollowing and hollowing location for filling; the polymer grouting technology is used for non-destructive repair, so that the reinforced foundation and the original building floor are re-formed into a composite foundation and play the bearing role of the new force system. In this embodiment, polymer grouting has the characteristics of light weight and high strength, high expansion force, early strength, water resistance, durability and environmental protection, and few construction restrictions.

[0037] Compared with the existing solution of breaking up the floor and re-reinforcing the floor, this embodiment has fewer restricted operations, is economical and environmentally friendly, has reliable quality, and can shorten the construction period by about 1 / 2 and save 1 / 3 of the cost.

[0038] like Figure 1 As shown, in this embodiment, if the original building floor structure is insufficient in elevation due to settlement deformation or uneven settlement deformation caused by the settlement of the original composite foundation, after the composite foundation reinforcement is completed, a layer of high-strength concrete is poured on the original building floor 8 to form a new pouring surface layer 7, and the building floor design elevation 1 is leveled to form the floor surface layer.

[0039] like Figure 2 As shown, the polymer grouting hole positions 17, the grouting steel pipe pile positions 18, and the threaded pile positions 19 in this embodiment are arranged in an array within the site.

[0040] Specifically, according to the consolidation state of the foundation soil after settlement and deformation and the parameters of the deep foundation soil, the length, spacing, diameter and other parameters of the threaded piles 14 are designed in accordance with the Technical Specifications for Building Foundation Treatment (JGJ79-2012) and the Code for Design of Building Foundations (GB50007-2011) and combined with the requirements of post-construction loads and settlement control standards.

[0041] According to the parameters of shallow foundation soil, in accordance with the Technical Code for Building Foundation Treatment (JGJ79-2012) and the Code for Design of Building Foundation (GB50007-2011) and combined with the requirements of post-construction load and settlement control standards, the length, spacing, diameter, grouting amount and other parameters of the grouting steel pipe column 13 are designed.

[0042] The spacing, depth, grouting pressure control and other parameters of polymer grouting are designed according to the gap between the shallow layer of the composite foundation and the building floor.

[0043] In the specific implementation of this embodiment: the foundation structure of a warehouse building floor is as follows: Figure 3 As shown, a graded gravel layer 21 is arranged under the original building floor 20, and the soil layers below it include backfill soil layer 23, soft soil layer 1 24, and soft soil layer 25 from top to bottom. Cement soil mixing piles 22 were used to reinforce the piles under the original building floor 20, and a 300mm thick graded gravel layer 21 was covered to form a pile-soil composite foundation. After about 6 years of use, the floor settled by about 20-30cm and cracked partially, affecting the normal use of the floor. The net height of the working space in the warehouse is 8m, and the warehouse door is 4m×4m. General mechanical equipment cannot enter the warehouse for operation.

[0044] against Figure 3 The project situation shown in the figure is reinforced and repaired in the following manner in this embodiment:

[0045] 1) All built shelves in the warehouse are cleared and debris is removed.

[0046] 2) Based on the soil parameters and settlement deformation obtained through supplementary drilling and testing, the parameters of the threaded piles 14, grouting steel pipe piles 13 and polymer grouting process are calculated and designed.

[0047] 3) If Figure 2 As shown, the threaded pile position 19 is located, a hole is drilled on the original building floor, and the threaded pile is constructed using a special construction machine. After the construction is completed, the threaded pile head plate is constructed and the graded crushed stone layer is backfilled.

[0048] 4) Insert steel bars into the holes for the threaded piles on the building floor and pour concrete to seal the holes.

[0049] 5) Locate the grouting steel pipe pile position 18, and drill a hole on the original building floor and press the steel pipe pile into it. Then, grouting is performed through the steel pipe column to seal the hole position of the original building floor.

[0050] 6) Locate the polymer grouting hole 17, drill a hole on the original floor, and insert the grouting pipe to the hollow position to be grouting, and complete the polymer grouting hole by hole.

[0051] 7) Check the construction status hole by hole according to the design and carry out inspection and testing work according to the design requirements.

[0052] 8) After passing the inspection, according to the final building floor design elevation, the original building floor surface layer is roughened and then poured with a new surface layer to complete the reinforcement and repair work of the original building floor composite foundation.

[0053] Although the above embodiments have described the concepts and embodiments of the purpose of the utility model in detail with reference to the accompanying drawings, ordinary technicians in this field can recognize that various improvements and modifications can still be made to the utility model without departing from the scope of the claims, so they are not described one by one here.

Claims

1. A reinforcement and repair structure for a building floor foundation, characterized in that: It includes threaded piles, grouting steel pipe piles and polymer grouting bodies. The buried depth of the threaded piles is greater than that of the grouting steel pipe piles. The threaded piles are used for reinforcing deep soil layers, the grouting steel pipe piles are used for reinforcing shallow soil layers, and the polymer grouting body is arranged at the hollow gap position under the original building floor.

2. A reinforcement and repair structure for a building floor foundation according to claim 1, characterized in that: The threaded piles are constructed by drilling holes on the original building floor and using construction machinery. The connection position between the threaded piles and the original building floor is provided with a threaded pile head plate and backfilled with a graded crushed stone layer.

3. A reinforcement and repair structure for a building floor foundation according to claim 2, characterized in that: Steel bars are implanted in the original building floor opening positions of the threaded piles and concrete is poured to seal the holes.

4. The reinforcement and repair structure for a building floor foundation according to claim 1 is characterized in that: The steel pipe pile is made by drilling a hole on the original building floor and pressing it in with a construction machine. After being pressed in, the steel pipe pile is grouting to form a grouting body on the periphery of the pile body.

5. The reinforcement and repair structure for a building floor foundation according to claim 1 is characterized in that: The positions of the hollow gaps in the building floor foundation include the position between the original building floor and the graded crushed stone layer below it and the position between the graded crushed stone layer and the soil layer below it.

6. The reinforcement and repair structure for a building floor foundation according to claim 1 is characterized in that: The threaded piles, the grouting steel pipe piles and the polymer grouting bodies are arranged in an array within the scope of the original building floor.

7. A reinforcement and repair structure for a building floor foundation according to claim 6, characterized in that: The polymer grouting bodies are arranged in an array around the threaded piles or the grouting steel pipe piles, and the grouting steel pipe piles are arranged in an array around each threaded pile.

8. The reinforcement and repair structure for a building floor foundation according to claim 1 is characterized by: The bottom of the threaded pile goes deep into the bearing layer, and the bottom of the grouting steel pipe pile goes deep into the soft soil layer under the backfill soil layer under the original building floor.

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