A construction deviation rectification method using a bag type grouting combined vibration rod compaction method

Abstract

The application relates to a construction deviation rectification method of a bag type grouting combined vibration rod compaction method, belongs to the field of building construction, and is a construction method for rectifying inclined buildings, determining the inclination degrees of each direction of the inclined buildings, selecting one side with large settlement of the inclined buildings for bag type grouting jacking construction, and simultaneously selecting the side with small settlement of the inclined buildings for vibration rod compaction method forced landing construction to compact the soil body, accelerate the settlement of the side with small settlement, and complete the whole structure back inclination of the inclined buildings. The application has the advantages of novel design, ingenious concept, fast construction speed, small resource consumption, small influence on the surrounding environment, obvious deviation rectification effect, good building stabilization and reinforcement effect, energy saving and environmental protection, and high economic efficiency.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of building construction, and particularly relates to building maintenance, and specifically relates to a method for rectifying a building by adopting a bag-type grouting method in cooperation with a vibrating rod compaction method. BACKGROUND

[0002] In the field of building construction in China, the buildings that have been built suffer from certain environmental changes and the like, which sometimes cause certain influences on the buildings themselves, such as ground cracks caused by earthquakes, water erosion and soil erosion and soil subsidence and the like, in the case of not too much influence, certain maintenance is needed for the buildings so that they can continue to be used normally. The Leaning Tower of Pisa is a typical example. In the past few hundred years since the beginning of construction, the Leaning Tower of Pisa has undergone numerous repairs, so that the Leaning Tower of Pisa remains tilted but has been standing safely there.

[0003] From the past building maintenance cases, the building tilting caused by uneven settlement of the foundation occurs in building engineering from time to time, and when the tilting is serious, it will affect the normal use of the building, and cause great loss to the life and property safety of the residents. The rectification engineering has many influencing factors, the rectification technology has high difficulty, and the risk is huge. The jacking method is a common building rectification method, which is a method for lifting the foundation or structure on the side of the tilted building with large settlement by using technical measures to achieve the purpose of rectification, and has the advantages of good controllability, high quality guarantee and the like. However, when the center of gravity of the high-rise building is high and the load is large, the foundation soil is not well treated and is seriously uneven, the method often has high cost and long construction period, and in view of this situation, soil excavation and other technical measures can be used on the side of the tilted building with small settlement to speed up the settlement, so as to achieve the purpose of tilting back of the building overall structure, but the soil excavation rectification sometimes cannot be implemented due to the limitation of construction space and the like.

[0004] The vibrating rod compaction method is a deep vibration compaction method that arose in the 1960s. The vibrating rod is fixed under the vibrator and sinks into the soil under the vibration of the vibrator. The vertical vibration in the sinking rod and the remaining vibration drives the surrounding soil layer to vibrate, causes the nearby soil to vibrate and sink, forms a vibration hole, and causes the entire construction site to sink when multiple points are arranged, so as to realize the compaction of the soil layer. In the past process, the vibrating rod compaction method is often used for pile foundation and is not expanded to other processes. SUMMARY

[0005] In order to solve the problems in the prior art, the present application provides a building rectification method by adopting a bag-type grouting method in cooperation with a vibrating rod compaction method, to realize the stability and reinforcement of the tilted building.

[0006] The technical problem to be solved by the present application is solved by the following technical means:

[0007] The application discloses a building deviation rectification method of a bag type grouting combined vibration rod compaction method.

[0008] In the application, the specific method of the bag type grouting jacking construction on the side with large settlement of the inclined building comprises the following steps.

[0009] S101 drilling: the grouting hole is arranged in the raft foundation range of the building; when the grouting hole is located outdoors, the outdoor fat trench backfill soil layer is first drilled through by using a mechanical hole forming device, and then the raft foundation and the cushion layer are cored to form holes; when the grouting hole is located indoors, the raft foundation and the cushion layer are directly cored to form holes;

[0010] S102 forming a grouting hole: a steel pipe is pressed in the hole formed in the step S101, and the grouting hole construction is completed by extruding the foundation soil; a sleeve is welded to the lower end of the steel pipe, the steel pipe is connected with a pile tip through threads on the sleeve, and the steel pipe is pressed into the hole to extrude the soil in sections; and the steel pipe and the pile tip are withdrawn in sections after the construction is completed;

[0011] S103 installing a grouting pipe and a bag: the grouting pipe with the bag is immediately lowered after the grouting hole construction is completed; the bag has grouting bags and jacking bags; the grouting pipe is composed of a grouting steel pipe and a grouting hose in the steel pipe; the lower section of the grouting hose is provided with the grouting bags; the hole diameter of the grouting bags is not less than the design requirement; the bags are in communication with the grouting hose; the grouting steel pipe is inserted into the bottom bearing stratum of the hole; the lowermost bag should enter the bearing stratum; when jacking grouting is needed, not less than two jacking bags are arranged at the bottom of the raft foundation or between the first and the second grouting bags from top to bottom along the upper part of the grouting hole;

[0012] S104 bag grouting: the grouting bags are grouted according to the sequence of symmetric construction from both sides to the middle; the grouting sequence of the same grouting hole is as follows: the bottom bag is grouted first, the top bag is grouted second, the middle bags are grouted from bottom to top, and finally the pile bottom is grouted through the grouting steel pipe to form a pile bottom consolidation body; the grouting process is strictly monitored to prevent leakage from affecting the hole expanding effect; after the grouting of the grouting bags is completed, the jacking bags are grouted; the grouting amount and the grouting pressure are determined according to the building lifting control amount design requirement, and the grouting bags are ensured not to be damaged;

[0013] S105 hole sealing: after the grouting is completed, the grouting hole is sealed by using micro-expansion concrete or grouting material.

[0014] In the present application, the side with smaller building settlement is selected to carry out the vibration pile compaction method, and the specific method comprises the following steps:

[0015] S201: manufacturing a vibration pile: manufacturing a vibration pile according to the design requirements and construction conditions;

[0016] S202: vibration point positioning: positioning the vibration point according to the building deviation design drawing;

[0017] S203: foundation drilling construction: drilling through the backfill soil layer by using a mechanical hole forming device, and then coring the raft and cushion, directly coring the raft and cushion in the room, and completing the hole forming construction of the raft foundation and the soil body above the foundation;

[0018] S204: vibration pile sinking: according to the vibration point position set in step S202, the vibration hammer is used to vertically sink the vibration pile to the design depth under the action of the vibration load, wherein the sinking speed of the vibration pile is ≤1.5 m / min;

[0019] S205: bottom vibration: after the vibration pile is sunk to the design depth, the frequency of the vibration hammer is adjusted to a low frequency state for vibration treatment;

[0020] S206: vibration lifting and reverse insertion: after the vibration treatment is completed, the vibration pile is lifted, vibration is performed while lifting, the vibration hole is backfilled, then the reverse insertion treatment is performed by using the vibration pile, and after the reverse insertion is completed, the vibration pile is lifted to the ground surface;

[0021] S207: according to steps S204-S206, the remaining vibration points are sequentially constructed, and when the forced lowering effect does not meet the requirements, the vibration point construction can be supplemented according to the requirements.

[0022] In the present application, the construction sequence of the grouting hole in step S102 is: first, the building outside grouting hole construction is performed, then the indoor grouting hole construction is performed, multiple rows of grouting holes can be constructed, and each row of grouting holes is symmetrically spaced according to the sequence of first two sides and then the middle.

[0023] In the present application, the grouting material used in step S104 is cement slurry, the cement used is P.042.5 ordinary portland cement, the water-cement ratio is 0.4-0.5, 0.05% of the weight of the cement is mixed with aluminum powder, and 5% of the weight of the cement is mixed with water glass.

[0024] In the present application, the vibration construction sequence in step S203 is: first, the building outside vibration point construction is performed, then the indoor vibration point construction is performed, and multiple rows of vibration points can be constructed.

[0025] In the present application, the side with smaller settlement of the inclined building is selected for the vibration pile compaction method forced construction, the vibration frequency range in the vibration pile sinking process in step S204 is 30-50Hz, the residual vibration frequency in step S205 is 15-20Hz, the residual vibration treatment time is 15-180s, the vibration frequency of the vibration pile in step S206 is 30-50Hz, and the frequency of the vibration hammer in the reverse insertion treatment is 15-20Hz.

[0026] Further, during the construction process, the building settlement and inclination need to be monitored in real time, and the water level gauge and the theodolite observation station set during the construction process are used for monitoring.

[0027] Further, in step S203, the distance between the vibration point position and the building body is not less than 0.5m, so as to avoid the adverse effects of the vibration on the building, and the spacing of each row of vibration points is 1.5-3m, the smaller the spacing, the greater the sinking depth of the vibration pile and the greater the site settlement, and when multiple rows of vibration points are used, the front and rear rows can be arranged in a triangular or square shape.

[0028] Further, in the vibration pile compaction method forced sinking step, when the foundation soil type is loess, expansive soil and the like in step S204, water flushing can be performed, and silt, sand and the like can be selected according to the needs, and for some soil, high-pressure water flushing can quickly clean the vibration hole.

[0029] Further, in the vibration pile compaction method forced sinking step, in step S206, the backfill is performed by using the in-situ soil material of the foundation site.

[0030] Compared with the prior art, the technical scheme of the present application has the following advantages:

[0031] (1) The present application is directed to the side with larger settlement of the inclined building for the bag-type grouting jacking construction, which eliminates the hidden danger of further settlement, and the side with smaller settlement of the inclined building is subjected to the vibration pile compaction method forced construction, which accelerates the settlement, so as to realize the purpose of quickly returning the building to the inclined state, and the correction effect is obvious.

[0032] (2) The bag-type grouting jacking of the present application not only eliminates the hidden danger of further settlement, but also produces a certain amount of stability and lifting effect on the building;

[0033] (3) The vibration pile compaction method forced construction of the present application not only accelerates the settlement of the building, but also compacts the soil body, stabilizes the building, and avoids the building from continuing to be affected by the environment during and after the construction process;

[0034] (4) The inclined building can be subjected to the bag-type grouting jacking construction and the vibration pile compaction method forced construction on both sides at the same time, the construction period is short, the resource consumption is small, and the construction has little impact on the surrounding environment;

[0035] (5) the bag type grouting jacking construction and the vibration rod compaction method provided by the application provide a thought, which can be adjusted according to actual conditions, and is strong in adaptability;

[0036] Therefore, the application has novel design, ingenious concept, fast construction speed, less resource consumption, less influence on the surrounding environment, obvious deviation rectification effect, good building stabilization and reinforcement effect, energy saving and environmental protection, and high economic efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 It is a schematic diagram of grouting hole and vibration point plane arrangement of the application;

[0038] Figure 2 It is a schematic diagram of bag grouting jacking and vibration hole profile of the application;

[0039] Figure 3 It is a schematic diagram of the hole forming pile tip structure of the application;

[0040] Figure 4 It is a construction flowchart of the vibration rod compaction method of the application;

[0041] Figure 5 It is a mechanical influence finite element model diagram of the building established by the building deviation rectification scheme of the application;

[0042] Figure 6 It is a vertical displacement nephogram of the building body established by the building deviation rectification scheme of the application;

[0043] Figure 7 It is a vertical displacement nephogram of the soil body near the building established by the building deviation rectification scheme of the application. DETAILED DESCRIPTION

[0044] The application will be further described below in combination with the drawings of the specification and specific preferred embodiments, but the protection scope of the application is not limited by this.

[0045] A bag type grouting combined vibration rod compaction method for building deviation rectification determines the inclination degree of each direction of an inclined building, selects a side with large settlement of the inclined building for bag type grouting jacking construction, eliminates the hidden danger of further settlement, and simultaneously produces lifting, and selects a side with small settlement of the inclined building for vibration rod compaction method forced settlement construction, compacts the soil body, and accelerates the settlement of the side with small settlement, so as to achieve the purpose of tilting back of the overall structure of the building.

[0046] The operation of selecting the side with large settlement of the inclined building for bag type grouting jacking construction is as follows, and the construction process is as shown in the structure of Figure 2 The structure is described as follows.

[0047] S101 positions the grouting hole, and the structure is shown in Figure 1, clean up the grouting hole construction working face, check the surrounding underground pipeline;

[0048] S102 drilling construction: first, the basement outside the first row of grouting hole construction, outdoor use mechanical success drill through the backfill soil layer, then the raft and cushion coring, then indoor second row of grouting hole construction, indoor directly to the raft and cushion coring, finally, indoor third row of grouting hole construction, each row of grouting hole according to the order of two sides first and then the middle of the symmetrical interval construction;

[0049] S103 grouting hole construction: in the completed hole into the steel pipe, such as Figure 3 The structure of the hole pile tip, the lower end of the steel pipe is connected with the pile tip through the threaded sleeve, the steel pipe is pressed into the soil to form a hole, the hole depth is not less than the design depth, the verticality deviation is 1%, after the completion of the grouting hole construction, the steel pipe and the pile tip are withdrawn in sections;

[0050] S104 placing grouting pipe and bag: immediately after the completion of the grouting hole construction, the grouting pipe and bag are lowered, the bag has grouting bag and lifting bag, the grouting pipe is composed of grouting steel pipe and grouting hose inside the steel pipe, in Figure 2 The lower part uses four grouting bags, the upper part uses two lifting bags, the bag length is 1.5m, the bag hole diameter is not less than 400mm, the maximum diameter is 500mm, the tensile strength is not less than 1MPa, the grouting hose uses D32 high pressure hose, each bag is connected with the grouting hose, the grouting steel pipe is inserted into the hole bottom bearing layer, the lowermost bag should enter the bearing layer, the uppermost bag is not less than 1m away from the raft;

[0051] S105 grouting bag grouting: the grouting material uses cement slurry, the cement uses P.042.5 ordinary portland cement, the water-cement ratio is 0.4-0.5, mixed with 0.05% of the weight of cement aluminum powder, 5% of the weight of cement water glass, the grouting cement dosage per meter depth should be determined according to the measured porosity and on-site test, the grouting sequence is outside first and then inside, each row is constructed in a symmetrical manner according to Figure 2 ①→②→③→④, that is, the bottom bag is grouted first, then the top bag is grouted, the middle bag is grouted from bottom to top, and finally the pile bottom is grouted through the grouting steel pipe to form a pile bottom consolidation body, the grouting process is strictly monitored to prevent leakage from affecting the hole expansion effect;

[0052] S106 lifting bag grouting: after 20 days of grouting bag grouting in the previous step, the pre-set lifting bag is grouted, the grouting pressure and grouting amount are determined by the design lifting amount, base pressure and stress area, the cement dosage of each bag is not less than 370kg, the grouting pressure is 3-4MPa;

[0053] S107 Real-time detection of building settlement and inclination during grouting process: can be observed through the leveling instrument and the theodolite observation station set during construction, and the grouting hole is closed with grouting cement slurry after grouting is completed. The indoor raft is sealed with C30 micro-expansion concrete or grouting cement slurry.

[0054] The operation steps of the vibration rod compaction method forced lowering construction are as follows:

[0055] S201 Vibration point positioning: level the construction site, remove the construction site debris, measure and lay out according to the design drawings, and position the vibration point position; the positions of multiple vibration points are arranged in a triangular shape, and the distance between the vibration points is 1.5 m;

[0056] S202 Vibration rod production: according to the required design construction requirements and construction conditions, produce vibration rods with appropriate length and diameter, generally select vibration rods with length of 6 m and diameter of 200 mm, forced lowering amount of 9 mm, and about 150 groups of vibration points and vibration rods are required;

[0057] S203 Foundation drilling construction: hole forming construction of raft foundation and soil above the foundation, outdoor mechanical hole forming is used to drill through the backfill soil layer, and the raft and cushion are cored, and the indoor raft and cushion are directly cored;

[0058] S204 Vibration rod sinking: according to the pre-set vibration point position, adjust the verticality of the vibration rod, ensure that the vibration rod is aligned with the center of the vibration point, and use the vibration hammer of the vibration compaction pile driver to vertically sink the vibration rod to the designed depth, wherein the vibration frequency of the vibration rod sinking process is 32 Hz, and the sinking speed of the vibration rod is 1.5 m / min;

[0059] S205 Bottom vibration: after the vibration rod is sunk to the designed depth, the frequency of the vibration hammer is adjusted to 16 Hz at this time, and the vibration treatment is 15 s;

[0060] S206 Vibration lifting and reverse insertion: after the vibration treatment is completed, the vibration rod is slowly lifted, and the vibration rod is vibrated while being lifted, the first lifting is to 3 m in depth, the vibration is inserted to 5 m in depth, the second lifting is to 1 m, and the reverse insertion is to 3 m, the vibration hole is backfilled with the original soil during the vibration lifting and reverse insertion process, and the soil is vibrated and pressed while being filled, until the vibration hole is filled, and finally the vibration rod is lifted to the ground. Among them, when the vibration rod is lifted, the vibration frequency of the vibration rod is 32 Hz, and the lifting speed of the vibration rod is 2.0 m / min; when the reverse insertion is processed, the frequency of the vibration hammer is 16 Hz, and the number of reverse insertion and the reverse insertion depth can be adjusted according to the on-site construction situation;

[0061] S207 According to the above steps S204-S206, the remaining vibration points are constructed in turn, and the forced lowering construction of the side with smaller settlement of the inclined building is completed, and if the forced lowering effect does not meet the requirements, additional vibration point construction can be performed according to the requirements.

[0062] The deviation correction scheme is used to construct a mechanical influence finite element model of the building, as shown in Figure 5 The left side uses the vibration rod compaction method to force down construction, and the right side uses the bag type grouting jacking construction. It can be seen from the figure that the influence range and degree of the building and the deviation correction scheme on the soil near the building. Since the density of the grid in the model figure is divided according to the complexity of the geometry of the region, if the geometry unit of the region is more, or there are more intersections and corners, the grid of the cover area shown will be more dense. The grid density of the soil near the construction in the figure is limited, which shows that the influence of the above deviation correction scheme on the soil near the building is limited, far from exceeding the bearing limit of the soil.

[0063] Figure 6 and Figure 7 are respectively the vertical displacement nephogram of the building and the vertical displacement nephogram of the soil near the building. The left side uses the vibration rod compaction method to force down construction, and the right side uses the bag type grouting jacking construction. The data simulation result is remarkable, and the deviation correction method of the present application has good effect. According to the formula (original project differential settlement- deviation correction amount generated by the present deviation correction method) / building foundation width, the calculation result shows that the overall inclination rate of the building after deviation correction in the present project is less than 1.5‰, which meets the requirement in the Design Specification for Building Foundation GB5007-2011 that the overall inclination rate of the building after deviation correction should be less than 3‰.

[0064] The above only describes the preferred embodiments of the present application, but is not limited to the above examples. Any modification, equivalent replacement and improvement within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for correcting building deviations using a combination of bag-type grouting and vibratory rod compaction, characterized in that: The inclination of each direction of the inclined building is determined, the side with large settlement of the inclined building is selected to carry out the bag type grouting jacking construction, and the side with small settlement of the inclined building is selected to carry out the forced sinking construction by the vibration rod compaction method, so as to compact the soil body and accelerate the settlement of the side with small settlement, and the whole structure of the inclined building is completed. The specific method of the side with large settlement of the inclined building selected to carry out the bag type grouting jacking construction comprises the following steps: S101 drilling: the grouting hole is arranged in the range of the building raft foundation, when the grouting hole is located outdoors, the outdoor fat trench backfill soil layer is first drilled through by using a mechanical hole forming, and then the raft foundation and the cushion are cored to form a hole; when the grouting hole is located indoors, the raft foundation and the cushion are directly cored to form a hole; S102 forming a grouting hole: in the hole forming of step S101, a steel pipe is pressed into the ground to complete the grouting hole construction, a sleeve is welded at the lower end of the steel pipe, the steel pipe is connected with a pile tip through the threads on the sleeve, and the steel pipe is pressed into the soil to form a hole in sections, and after the construction is completed, the steel pipe and the pile tip are withdrawn in sections; S103 installing a grouting pipe and a bag: immediately after the grouting hole construction is completed, a grouting pipe with a bag is lowered, the bag has grouting bags and jacking bags, the grouting pipe is composed of a grouting steel pipe and a grouting hose in the steel pipe, the lower section of the grouting hose is provided with a grouting bag, the hole diameter of the grouting bag is not less than the design requirement, the bag is in communication with the grouting hose, the grouting steel pipe is inserted into the bearing layer at the bottom of the hole, and the lowermost bag should enter the bearing layer; when jacking grouting is needed, not less than two jacking bags are arranged at the bottom of the raft foundation or between the first and second grouting bags from top to bottom along the upper part of the grouting hole; S104 bag grouting: the grouting bags are grouted in the order of symmetric construction from both sides to the middle first, the grouting sequence of the same grouting hole is that the bottom bag is grouted first, the top bag is grouted second, the middle bags are grouted from bottom to top, and finally the pile bottom grouting is carried out through the grouting steel pipe to form a pile bottom consolidation body, the grouting process is strictly monitored to prevent leakage from affecting the hole expansion effect; after the grouting of each grouting bag is completed for 20 days, the jacking bags arranged in advance are grouted, the grouting amount and the grouting pressure are determined according to the building lifting control amount design requirement, and it is ensured that the grouting bags are not damaged; S105 hole sealing: after the grouting is completed, the grouting hole is sealed with micro-expanding concrete or grouting material.

2. The building deviation correction method of claim 1, wherein: The specific method of the side with small settlement of the inclined building selected to carry out the forced sinking construction by the vibration rod compaction method comprises the following steps: S201 making a vibration rod: a vibration rod is made according to the design requirement and the construction condition; S202 vibration point positioning: the vibration point position is positioned according to the building deviation correction design drawing; S203 foundation drilling construction: after the outdoor backfill soil layer is drilled through by using a mechanical hole forming, the raft foundation and the cushion are cored, the indoor raft foundation and the cushion are directly cored, and the raft foundation and the soil body above the foundation are cored to form a hole; S204 vibration rod sinking: the vibration rod is vertically sunk to the design depth under the action of the vibration hammer according to the vibration point position set in step S202, wherein the sinking speed of the vibration rod is ≤1.5 m / min; S205 bottom vibration: the frequency of the vibration hammer is adjusted to low frequency state for vibration treatment after the vibration rod sinks to the designed depth; S206 vibration lifting and reverse insertion: after the vibration treatment, the vibration rod is lifted, and the vibration hole is backfilled while lifting and vibrating, then reverse insertion is performed by using the vibration rod, and after the reverse insertion is completed, the vibration rod is lifted to the ground surface; S207 the remaining vibration points are sequentially constructed according to steps S204-S206.

3. The building deviation correction method of claim 2, wherein: The construction sequence of the grouting hole in step S102 is: first, the construction of the building outside grouting hole is performed, then the construction of the indoor grouting hole is performed, multiple rows of grouting holes can be constructed, and each row of grouting holes is symmetrically spaced according to the sequence of first two sides and then the middle.

4. The building deviation correction method of claim 1, wherein: The grouting material used in step S104 is cement slurry, the cement used is P.042.5 ordinary portland cement, the water-cement ratio is 0.4-0.5, 0.05% of the weight of the cement is mixed with aluminum powder, and 5% of the weight of the cement is mixed with water glass.

5. The building deviation correction method of claim 2, wherein: The vibration construction sequence in step S203 is: first, the construction of the building outside vibration point is performed, then the construction of the indoor vibration point is performed, and multiple rows of vibration points can be constructed.

6. The building deviation correction method of claim 2, wherein: When the vibration rod compaction method forced landing construction is performed on the side with smaller building settlement, the vibration frequency range of the vibration rod during the sinking process in step S204 is 30-50Hz, the vibration frequency in step S205 is 15-20Hz, the vibration treatment time is 15-180s, the vibration frequency of the vibration rod when lifting the vibration rod in step S206 is 30-50Hz, and the frequency of the vibration hammer during the reverse insertion treatment is 15-20Hz.

7. The building deviation correction method of claim 2, wherein: In step S203, the distance between the vibration point position and the building body is not less than 0.5m, the distance between each row of vibration points is 1.5-3m, and when multiple rows of vibration points are constructed, the front and rear rows can be arranged in a triangular or square shape.

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