Reinforcing and deviation rectifying construction method for mixed coal bunker

Abstract

The invention discloses a mixed coal bunker reinforcing and deviation rectifying construction method which is specifically implemented according to the following steps that 1, according to design requirements, an operation pit is excavated in the position, to be subjected to static pressure pile underpinning, of a mixed coal bunker composite foundation; 2, a steel pipe concrete pile is adopted in the composite foundation for static pressure pile underpinning, static pressure pile underpinning is conducted on the side with large settlement, forced landing deviation rectifying work is conducted on the side with small settlement after reinforcement and settlement stopping of the side with the large settlement amount are completed, and static pressure pile underpinning work is conducted on the side with small settlement after forced landing deviation rectifying is completed; and 3, after underpinning of all the static pressure piles is finished, the operation pit is backfilled, and reinforcing and sinking stopping work is finished. According to the deviation rectifying method, the problem that the deviation rectifying effect is poor due to the fact that the deviation rectifying amount is difficult to accurately control in an existing deviation rectifying method is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of structure reinforcement and deviation correction, and particularly relates to a method for reinforcing and deviation correction of a mixed coal bunker. Background Art

[0002] Lean-down correction refers to the correction and reinforcement of a building's structure to ensure its safety and restore its normal use function when the building's superstructure deviates from its vertical position and tilts due to uneven settlement of the foundation or some other reason of the building itself. When the degree of inclination of the building exceeds the requirements of relevant national standards and seriously affects the safety of the building and its normal use, measures are taken to ensure the safety of the building and restore its normal use function.

[0003] The correction process must follow the following principles: (1) Before correction, a detailed investigation should be conducted on the settlement, tilt, cracking, structure, foundation, surrounding environment, geology, hydrology and other conditions of the correction project, and a thorough correction plan should be customized; (2) The original data should be combined with supplementary investigation and measurement to clarify the actual situation and status of the foundation and superstructure, and analyze and find out the cause of the deviation; (3) When designing the correction, the residual deformation of the foundation soil and the impact of different forms of foundations and surrounding building foundations on settlement caused by the correction should be fully considered; (4) The building to be corrected should have a certain overall stiffness. If the stiffness cannot meet the correction requirements, temporary reinforcement should be carried out first.

[0004] The patent is entitled "A method for reinforcement and correction of foundation", and the Chinese invention patent publication number is CN111779045B. The patent comprises the following steps: implanting anchor steel bars around the first pile hole, constructing anchor static pressure steel pipe piles, and repeatedly squeezing and grouting the deep soil through the steel pipe piles. After the grouting is completed, installing the pressure component and temporarily locking the steel pipe piles. Opening a second pile hole on the foundation ground to be constructed and inserting the grouting steel pipe, the grouting steel pipe also uses repeated grouting to locally directional reinforce the shallow soil. During the grouting process, the pressure value of the steel pipe pile is monitored, and the steel pipe pile is progressively re-pressurized by the pressure component to achieve slow reinforcement and lifting of the settled soil layer and foundation correction. The method is to slowly reinforce and lift the settled soil layer and directionally correct the foundation through repeated, multi-point grouting and progressive re-pressing of the steel pipe piles in the deep and shallow soil, which can effectively reduce or eliminate the uneven settlement and the inclination of the entire building, and realize the combination of reinforcement and correction.

[0005] The patent name is a shallow foundation building correction reinforcement structure and its construction method, and the Chinese invention patent with publication number CN107090860B discloses a shallow foundation building correction reinforcement structure and its construction method, including a pile cap, anchor static pressure piles, a pile sealing plate and a filling layer. The pile cap is the original building shallow foundation after the building is corrected or an additional foundation part is added to the original building shallow foundation. A pile pressure hole is opened on the upper surface of the pile cap, and the static pressure pile is located in the pile pressure hole and the pile top of the static pressure pile is located in the pile pressure hole. In the hole section of the shallow foundation or pile cap of the original building, concrete is poured in the pile hole, and the pile top of the anchor static pile is provided with anchor bars, which are anchored in the concrete in the pile hole; the pile anchor rods penetrate into the cap from the upper surface of the cap and are located around the periphery of the pile hole, and the upper ends of the pile anchor rods are exposed on the upper surface of the pile cap, and concrete is poured in the pile hole so that the pile anchor rods are sealed therein to form a pile sealing plate; this method not only corrects the deviation of the shallow foundation building, but also plays a role in reinforcing the original foundation that does not meet the requirements.

[0006] The patent name is a static pressure pile construction method for pressure regulating and unloading buildings in a narrow space. The Chinese invention patent with publication number CN112227366A includes fixing a protective plate assembly and a pile column unit on the surface of a supported object; placing a jack between the protective plate assembly and the pile column unit, and statically pressing the pile column unit into the ground by lifting the jack. After the pile column unit settles stably, continue to add pile column units. After the two are welded and fixed, reinstall the jack, lift the jack, and when the pressure value of the jack reaches the set value, stop lifting the jack to complete the construction of the pile column. This method has the characteristics of light and flexible construction equipment, simple operation, convenient construction, small working surface, low energy consumption, no pollution, and no damage to existing facilities of the upper structure during construction. In the process of static pressure sinking of H-shaped steel piles, a high-pressure electric oil pump equipped with a one-way relief valve is used to control the jack to apply pressure to the H-shaped steel pile, which can be strictly controlled according to the designed pile pressure force to ensure smooth pile pressing.

[0007] However, the above-mentioned patents all adopt the jacking method, that is, lifting the area with large settlement to achieve correction. This process is complicated to operate and the correction amount is difficult to accurately control. Summary of the invention

[0008] The purpose of the present invention is to provide a mixed coal bunker reinforcement and deviation correction method to solve the problems of the existing deviation correction method that it is difficult to accurately control the deviation correction amount and the operation is complicated.

[0009] The technical solution adopted by the present invention is a mixed coal bunker reinforcement and deviation correction method, which is specifically implemented according to the following steps: Step 1: excavate an operation pit at the location where the static pressure pile underpinning is to be performed in the composite foundation of the mixed coal bunker according to the design requirements; Step 2: Use steel tube concrete piles to underpin the static piles in the composite foundation. First, the static piles are underpinned on the side with larger settlement. After the reinforcement and settlement arrest on the side with larger settlement is completed, the side with smaller settlement is forced to land and correct the deviation. After the forced landing and correction on the side with smaller settlement is completed, the static piles are underpinned. Step 3: After all static pressure piles are replaced, backfill the operation pit and the reinforcement and anti-sinking work is completed.

[0010] The present invention is also characterized in that: In step 2, the static pile underpinning on the side with greater settlement requires that the top of the steel tube concrete pile be connected to the bottom of the raft slab.

[0011] In step 2, the specific process of forced landing and deviation correction work on the side with smaller settlement is: first, the steel tube concrete pile is pressed to the target position of the operation pit. After the pile is pressed, a jack virtual top raft is placed on the top of the steel tube concrete pile, and then forced landing and deviation correction are carried out.

[0012] The specific process of forced landing correction is as follows: Coal is placed in the mixed coal bin at the position corresponding to the side with smaller settlement, and the other positions are vacant. Under the gravity of the coal, the composite foundation on the side with smaller settlement produces vertical settlement, the raft plate is in tight contact with the jack, the jack is subjected to force, and then all the jacks are simultaneously depressurized to the designed height, and the composite foundation further settles vertically, so that the raft plate is in tight contact with the jack, and the process of jack depressurization and vertical settlement of the composite foundation is repeated until the composite foundation settles to the target height and the forced landing is stopped.

[0013] In step 2, the static pile underpinning on the side with smaller settlement requires that the top of the steel tube concrete pile be connected to the bottom of the raft slab.

[0014] The number of static pressure piles arranged on the side with smaller settlement shall not be greater than the number of static pressure piles arranged on the side with larger settlement.

[0015] In step 3, after all static piles are replaced, cement slurry is poured around the static piles to form a reinforcement layer.

[0016] The thickness of the reinforcement layer shall not be greater than half of the distance between two adjacent static pressure piles.

[0017] A plurality of anchor rods are arranged in the reinforcement layer at equal intervals along its circumference.

[0018] The beneficial effects of the present invention are: (1) The mixed coal bunker reinforcement and deviation correction method of the present invention uses static pressure piles to reinforce the composite foundation to prevent the coal bunker from continuing to sink. At the same time, forced landing and deviation correction are used to return the coal bunker inclination rate to the standard limit. The deviation correction process is simple and easy to operate, which greatly shortens the construction efficiency. (2) The mixed coal bunker reinforcement and deviation correction method of the present invention uses a jack to temporarily support the load of the mixed coal bunker, and then reserves a forced landing space so that the part that needs forced landing is lowered to a specified height and then resumes bearing the load. During the deviation correction process, the deviation correction speed and deviation correction amount can be accurately controlled by adjusting the height of the jack, thereby improving the deviation correction effect; (3) The mixed coal bunker reinforcement and deviation correction method of the present invention can further improve the bearing capacity of the pile foundation by pouring a reinforcement layer after the static pressure pile construction is completed and before the operation pit is backfilled, thereby improving the strength and service life of the pile foundation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of the tilted mixed coal bin in the mixed coal bin reinforcement and deviation correction method of the present invention; Figure 2 It is a schematic diagram of the static pile pressing work in the composite foundation in the method for reinforcing and rectifying the deviation of the mixed coal bunker of the present invention; Figure 3 It is a schematic diagram of the static pressure pile underpinning work in the composite foundation in the mixed coal bunker reinforcement and deviation correction method of the present invention; Figure 4 It is a schematic diagram of the forced landing correction work of the composite foundation in the mixed coal bunker reinforcement correction method of the present invention; Figure 5 It is a schematic diagram of the virtual top of the jack during the forced landing and deviation correction process of the composite foundation in the mixed coal bunker reinforcement and deviation correction method of the present invention; Figure 6 It is a schematic diagram of the static pile underpinning work after the forced landing and deviation correction of the composite foundation in the mixed coal bunker reinforcement and deviation correction method of the present invention; Figure 7 It is a schematic diagram of backfilling the operation pit after the forced landing and deviation correction in the mixed coal bunker reinforcement and deviation correction method of the present invention.

[0020] In the figure, 1. mixed coal bunker, 2. composite foundation, 3. raft, 4. static pressure piles, 5. jack, 6. coal. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Example 1 The mixed coal bunker reinforcement and deviation correction method of the present invention is that the bottom of the mixed coal bunker 1 is provided with a raft 3, and the bottom of the raft 3 is a composite foundation 2. Due to the water seepage in the composite foundation 2, the mixed coal bunker 1 is tilted. The present invention adopts a forced landing method for deviation correction. The forced landing method is a method of taking measures such as digging or softening the foundation to reduce its rigidity and increase the tilt in the opposite direction, thereby solving the problem of uneven settlement of the tilted mixed coal bunker and realizing precise control of forced landing and tilt correction; Follow the steps below to implement it: Step 1, according to the weight of the upper structure of the mixed coal bunker 1 to be corrected and the settlement and inclination conditions, determine the number and layout of the static pressure piles, and excavate an operation pit at the position where the static pressure piles are to be replaced in the composite foundation 2 of the mixed coal bunker according to the design requirements; Step 2, using steel tube concrete piles to carry out pile driving in the composite foundation 2, after the pile driving is completed, the static pressure piles are first replaced on the side with larger settlement, and then the side with larger settlement is reinforced to stop settlement, and a new force system is formed with the existing composite foundation to bear the upper load to achieve the effect of stopping settlement and reinforcement, and the side with smaller settlement is not supported by static pressure piles. After the reinforcement and stopping of the side with larger settlement is completed, the side with smaller settlement is forced to land and correct the deviation, and the forced landing is stopped after the settlement reaches the forced landing correction requirement. After the forced landing correction is completed, the static pressure piles are replaced to reinforce and stop the settlement of the side with smaller settlement; Step 3: After all static pressure piles are replaced, backfill the operation pit and the reinforcement and anti-sinking work is completed.

[0023] Example 2 The mixed coal bunker reinforcement and deviation correction method of the present invention is that the bottom of the mixed coal bunker 1 is provided with a raft 3, and the bottom of the raft 3 is a composite foundation 2. Due to the water seepage in the composite foundation 2, the mixed coal bunker 1 is tilted. The present invention adopts a forced landing method for deviation correction. The forced landing method is a method of taking measures such as digging or softening the foundation to reduce its rigidity and increase the tilt in the opposite direction, thereby solving the problem of uneven settlement of the tilted mixed coal bunker and realizing precise control of forced landing and tilt correction; Follow the steps below to implement it: Step 1, according to the weight of the upper structure of the mixed coal bunker 1 to be corrected and the settlement and inclination conditions, determine the number and layout of the static pressure piles, and excavate an operation pit at the position where the static pressure piles are to be replaced in the composite foundation 2 of the mixed coal bunker according to the design requirements; Step 2, using steel tube concrete piles to carry out pile driving in the composite foundation 2, after the pile driving is completed, the static pressure piles are first replaced on the side with larger settlement, and then the side with larger settlement is reinforced to stop settlement, and a new force system is formed with the existing composite foundation to bear the upper load to achieve the effect of stopping settlement and reinforcement, and the side with smaller settlement is not supported by static pressure piles. After the reinforcement and stopping of the side with larger settlement is completed, the side with smaller settlement is forced to land and correct the deviation, and the forced landing is stopped after the settlement reaches the forced landing correction requirement. After the forced landing correction is completed, the static pressure piles are replaced to reinforce and stop the settlement of the side with smaller settlement; Among them, the static pressure pile underpinning on the side with greater settlement requires that the top of the steel tube concrete pile be connected to the bottom of the raft 3; Step 3: After all static pressure piles are replaced, backfill the operation pit and the reinforcement and anti-sinking work is completed.

[0024] Example 3 The mixed coal bunker reinforcement and deviation correction method of the present invention is that the bottom of the mixed coal bunker 1 is provided with a raft 3, and the bottom of the raft 3 is a composite foundation 2. Due to the water seepage in the composite foundation 2, the mixed coal bunker 1 is tilted. The present invention adopts a forced landing method for deviation correction. The forced landing method is a method of taking measures such as digging or softening the foundation to reduce its rigidity and increase the tilt in the opposite direction, thereby solving the problem of uneven settlement of the tilted mixed coal bunker and realizing precise control of forced landing and tilt correction; Follow the steps below to implement it: Step 1, according to the weight of the upper structure of the mixed coal bunker 1 to be corrected and the settlement and inclination conditions, determine the number and layout of the static pressure piles, and excavate an operation pit at the position where the static pressure piles are to be replaced in the composite foundation 2 of the mixed coal bunker according to the design requirements; Step 2, using steel tube concrete piles to carry out pile driving in the composite foundation 2, after the pile driving is completed, the static pressure piles are first replaced on the side with larger settlement, and then the side with larger settlement is reinforced to stop settlement, and a new force system is formed with the existing composite foundation to bear the upper load to achieve the effect of stopping settlement and reinforcement, and the side with smaller settlement is not supported by static pressure piles. After the reinforcement and stopping of the side with larger settlement is completed, the side with smaller settlement is forced to land and correct the deviation, and the forced landing is stopped after the settlement reaches the forced landing correction requirement. After the forced landing correction is completed, the static pressure piles are replaced to reinforce and stop the settlement of the side with smaller settlement; Among them, the static pressure pile underpinning on the side with greater settlement requires that the top of the steel tube concrete pile be connected to the bottom of the raft 3; And the static pile underpinning on the side with smaller settlement needs to connect the top of the steel tube concrete pile with the bottom of the raft 3; Step 3: After all static pressure piles are replaced, backfill the operation pit and the reinforcement and anti-sinking work is completed.

[0025] Example 4 The mixed coal bunker reinforcement and deviation correction method of the present invention is that the bottom of the mixed coal bunker 1 is provided with a raft 3, and the bottom of the raft 3 is a composite foundation 2. Due to the water seepage in the composite foundation 2, the mixed coal bunker 1 is tilted. The present invention adopts a forced landing method for deviation correction. The forced landing method is a method of taking measures such as digging or softening the foundation to reduce its rigidity and increase the tilt in the opposite direction, thereby solving the problem of uneven settlement of the tilted mixed coal bunker and realizing precise control of forced landing and tilt correction; Follow the steps below to implement it: Step 1, according to the weight of the upper structure of the mixed coal bunker 1 to be corrected and the settlement and inclination conditions, determine the number and layout of the static pressure piles, and excavate an operation pit at the position where the static pressure piles are to be replaced in the composite foundation 2 of the mixed coal bunker according to the design requirements; Step 2, using steel tube concrete piles to drive piles in the composite foundation 2, after the driving piles are completed, the static pressure piles 4 are first replaced on the side with larger settlement, and then the side with larger settlement is reinforced to stop settlement, forming a new force system with the existing composite foundation to bear the upper load to achieve the effect of stopping settlement and reinforcement, and the side with smaller settlement is not supported by static pressure piles 4, after the reinforcement and stopping of the side with larger settlement is completed, the side with smaller settlement is forced to land and correct the deviation, and the forced landing is stopped after the settlement reaches the forced landing correction requirement, and the static pressure piles 4 are replaced after the forced landing correction is completed to reinforce and stop the settlement of the side with smaller settlement; Among them, the static pressure pile 4 underpinning on the side with greater settlement needs to connect the top of the steel tube concrete pile with the bottom of the raft 3; And the static pressure pile 4 underpinning on the side with smaller settlement needs to connect the top of the steel tube concrete pile with the bottom of the raft 3; The specific process of correcting the forced landing on the side with smaller settlement is as follows: First, the steel tube concrete pile is driven to the target position of the operation pit. After the driving is completed, a jack 5 is placed on the top of the steel tube concrete pile to virtually top the raft 3, and then forced landing and deviation correction are performed; by setting the jack 5 to a virtual top collision state, space can be reserved to create conditions for the settlement of the composite foundation, and the reserved space can realize accurate control of the deviation correction amount; Step 3, after all static pressure piles 4 are replaced, the operation pit is backfilled and the reinforcement and anti-sinking work is completed.

[0026] Example 5 The mixed coal bunker reinforcement and deviation correction method of the present invention is that the bottom of the mixed coal bunker 1 is provided with a raft 3, and the bottom of the raft 3 is a composite foundation 2. Due to the water seepage in the composite foundation 2, the mixed coal bunker 1 is tilted. The present invention adopts a forced landing method for deviation correction. The forced landing method is a method of taking measures such as digging or softening the foundation to reduce its rigidity and increase the tilt in the opposite direction, thereby solving the problem of uneven settlement of the tilted mixed coal bunker and realizing precise control of forced landing and tilt correction; Follow the steps below to implement it: Step 1, according to the weight of the upper structure of the mixed coal bunker 1 to be corrected and the settlement and inclination conditions, determine the number and layout of the static pressure piles, and excavate an operation pit at the position where the static pressure piles are to be replaced in the composite foundation 2 of the mixed coal bunker according to the design requirements; Step 2, using steel tube concrete piles to carry out pile driving in the composite foundation 2, after the pile driving is completed, the static pressure piles 4 are first replaced on the side with larger settlement, and then the side with larger settlement is reinforced to stop settlement, and a new force system is formed with the existing composite foundation to bear the upper load to achieve the effect of stopping settlement and reinforcement, and the static pressure piles 4 are not replaced on the side with smaller settlement, and after the reinforcement and stopping of settlement on the side with larger settlement is completed, the side with smaller settlement is forced to land and correct deviation, and the forced landing is stopped after the settlement reaches the forced landing correction requirement, and the static pressure piles are replaced after the forced landing correction is completed to reinforce and stop settlement on the side with smaller settlement; Among them, the static pressure pile 4 underpinning on the side with greater settlement needs to connect the top of the steel tube concrete pile with the bottom of the raft 3; And the static pressure pile 4 underpinning on the side with smaller settlement needs to connect the top of the steel tube concrete pile with the bottom of the raft 3; The specific process of correcting the forced landing on the side with smaller settlement is as follows: First, the steel tube concrete pile is pressed to the target position of the operation pit. After the pile is pressed, a jack 5 is placed on the top of the steel tube concrete pile to virtually cover the raft 3. Coal 6 is placed in the coal mixing bunker 1 at a position corresponding to the side with smaller settlement. The remaining positions are vacant. Under the gravity of the coal 6, the composite foundation on the side with smaller settlement produces vertical settlement, and the raft 3 is in tight contact with the jack 5. The jack 5 is stressed. Then all the jacks 5 are simultaneously depressurized to the designed height, and the composite foundation further vertically settles, so that the raft 3 is in tight contact with the jack 5. The process of depressurizing the jack 5 and vertical settlement of the composite foundation is repeated until the composite foundation settles to the target height and stops forced landing. The height of each descent of the jack 5 is carried out according to the pre-designed height, and the amount of descent is as small as possible each time to avoid the structural impact of the ground mixed coal bunker 1 caused by a large amount of descent. The descent is carried out on the principle of low descent and multiple times until the overall descent reaches the designed height; Step 3: After all static pressure piles are replaced, backfill the operation pit and the reinforcement and anti-sinking work is completed.

[0027] Example 6 The mixed coal bunker reinforcement and deviation correction method of the present invention is that the bottom of the mixed coal bunker 1 is provided with a raft 3, and the bottom of the raft 3 is a composite foundation 2. Due to the water seepage in the composite foundation 2, the mixed coal bunker 1 is tilted. The present invention adopts a forced landing method for deviation correction. The forced landing method is a method of taking measures such as digging or softening the foundation to reduce its rigidity and increase the tilt in the opposite direction, thereby solving the problem of uneven settlement of the tilted mixed coal bunker and realizing precise control of forced landing and tilt correction; Step 1, according to the weight of the upper structure of the mixed coal bunker 1 to be corrected and the settlement and inclination conditions, determine the number and layout of the static pressure piles, and excavate an operation pit at the position where the static pressure piles are to be replaced in the composite foundation 2 of the mixed coal bunker according to the design requirements; Step 2, using steel tube concrete piles to carry out pile driving in the composite foundation 2, after the pile driving is completed, the static pressure piles are first replaced on the side with larger settlement, and then the side with larger settlement is reinforced to stop settlement, and a new force system is formed with the existing composite foundation to bear the upper load to achieve the effect of stopping settlement and reinforcement, and the side with smaller settlement is not supported by static pressure piles. After the reinforcement and stopping of the side with larger settlement is completed, the side with smaller settlement is forced to land and correct the deviation, and the forced landing is stopped after the settlement reaches the forced landing correction requirement. After the forced landing correction is completed, the static pressure piles are replaced to reinforce and stop the settlement of the side with smaller settlement; Among them, the static pressure pile 4 underpinning on the side with greater settlement needs to connect the top of the steel tube concrete pile with the bottom of the raft 3; And the static pressure pile 4 underpinning on the side with smaller settlement needs to connect the top of the steel tube concrete pile with the bottom of the raft 3; The specific process of correcting the forced landing on the side with smaller settlement is as follows: First, the steel tube concrete pile is pressed to the target position of the operation pit. After the pile is pressed, a jack 5 is placed on the top of the steel tube concrete pile to virtually cover the raft 3. Coal 6 is placed in the coal mixing bunker 1 at a position corresponding to the side with smaller settlement. The remaining positions are vacant. Under the gravity of the coal 6, the composite foundation on the side with smaller settlement produces vertical settlement, and the raft 3 is in tight contact with the jack 5. The jack 5 is stressed. Then all the jacks 5 are simultaneously depressurized to the designed height, and the composite foundation further vertically settles, so that the raft 3 is in tight contact with the jack 5. The process of depressurizing the jack 5 and vertical settlement of the composite foundation is repeated until the composite foundation settles to the target height and stops forced landing. The height of each descent of the jack 5 is carried out according to the pre-designed height, and the amount of descent is as small as possible each time to avoid the structural impact of the ground mixed coal bunker 1 caused by a large amount of descent. The descent is carried out on the principle of low descent and multiple times until the overall descent reaches the designed height; Step 3: After all static pressure piles are replaced, pour cement slurry around the static pressure piles to form a reinforcement layer, then backfill the operation pit to complete the reinforcement and anti-sinking work.

[0028] Example 7 The mixed coal bunker reinforcement and deviation correction method of the present invention is that the bottom of the mixed coal bunker 1 is provided with a raft 3, and the bottom of the raft 3 is a composite foundation 2. Due to the water seepage in the composite foundation 2, the mixed coal bunker 1 is tilted. The present invention adopts a forced landing method for deviation correction. The forced landing method is a method of taking measures such as digging or softening the foundation to reduce its rigidity and increase the tilt in the opposite direction, thereby solving the problem of uneven settlement of the tilted mixed coal bunker and realizing precise control of forced landing and tilt correction; Step 1, according to the weight of the upper structure of the mixed coal bunker 1 to be corrected and the settlement and inclination conditions, determine the number and layout of the static pressure piles, and excavate an operation pit at the position where the static pressure piles are to be replaced in the composite foundation 2 of the mixed coal bunker according to the design requirements; Step 2, using steel tube concrete piles to carry out pile driving in the composite foundation 2, after the pile driving is completed, the static pressure piles are first replaced on the side with larger settlement, and then the side with larger settlement is reinforced to stop settlement, and a new force system is formed with the existing composite foundation to bear the upper load to achieve the effect of stopping settlement and reinforcement, and the side with smaller settlement is not supported by static pressure piles. After the reinforcement and stopping of the side with larger settlement is completed, the side with smaller settlement is forced to land and correct the deviation, and the forced landing is stopped after the settlement reaches the forced landing correction requirement. After the forced landing correction is completed, the static pressure piles are replaced to reinforce and stop the settlement of the side with smaller settlement; Among them, the static pressure pile underpinning on the side with greater settlement requires that the top of the steel tube concrete pile be connected to the bottom of the raft 3; And the static pile underpinning on the side with smaller settlement needs to connect the top of the steel tube concrete pile with the bottom of the raft 3; The specific process of correcting the forced landing on the side with smaller settlement is as follows: First, the steel tube concrete pile is pressed to the target position of the operation pit. After the pile is pressed, a jack 5 is placed on the top of the steel tube concrete pile to virtually cover the raft 3. Coal 6 is placed in the coal mixing bunker 1 at a position corresponding to the side with smaller settlement. The remaining positions are vacant. Under the gravity of the coal 6, the composite foundation on the side with smaller settlement produces vertical settlement, and the raft 3 is in tight contact with the jack 5. The jack 5 is stressed. Then all the jacks 5 are simultaneously depressurized to the designed height, and the composite foundation further vertically settles, so that the raft 3 is in tight contact with the jack 5. The process of depressurizing the jack 5 and vertical settlement of the composite foundation is repeated until the composite foundation settles to the target height and stops forced landing. The height of each descent of the jack 5 is carried out according to the pre-designed height, and the amount of descent is as small as possible each time to avoid the structural impact of the ground mixed coal bunker 1 caused by a large amount of descent. The descent is carried out on the principle of low descent and multiple times until the overall descent reaches the designed height; Step 3: After all static pressure piles are replaced, pour cement slurry around the static pressure piles to form a reinforcement layer. The thickness of the reinforcement layer should not be greater than half of the distance between two adjacent static pressure piles to avoid interference between the two reinforcement layers and cause inconsistent wall thickness. Then backfill the operation pit and the reinforcement and anti-sinking work is completed.

[0029] Example 8 The mixed coal bunker reinforcement and deviation correction method of the present invention is that the bottom of the mixed coal bunker 1 is provided with a raft 3, and the bottom of the raft 3 is a composite foundation 2. Due to the water seepage in the composite foundation 2, the mixed coal bunker 1 is tilted. The present invention adopts a forced landing method for deviation correction. The forced landing method is a method of taking measures such as digging or softening the foundation to reduce its rigidity and increase the tilt in the opposite direction, thereby solving the problem of uneven settlement of the tilted mixed coal bunker and realizing precise control of forced landing and tilt correction; Step 1, according to the weight of the upper structure of the mixed coal bunker 1 to be corrected and the settlement and inclination conditions, determine the number and layout of the static pressure piles, and excavate an operation pit at the position where the static pressure piles are to be replaced in the composite foundation 2 of the mixed coal bunker according to the design requirements; Step 2, using steel tube concrete piles to carry out pile driving in the composite foundation 2, after the pile driving is completed, the static pressure piles are first replaced on the side with larger settlement, and then the side with larger settlement is reinforced to stop settlement, and a new force system is formed with the existing composite foundation to bear the upper load to achieve the effect of stopping settlement and reinforcement, and the side with smaller settlement is not supported by static pressure piles. After the reinforcement and stopping of the side with larger settlement is completed, the side with smaller settlement is forced to land and correct the deviation, and the forced landing is stopped after the settlement reaches the forced landing correction requirement. After the forced landing correction is completed, the static pressure piles are replaced to reinforce and stop the settlement of the side with smaller settlement; Among them, the static pressure pile underpinning on the side with greater settlement requires that the top of the steel tube concrete pile be connected to the bottom of the raft 3; And the static pile underpinning on the side with smaller settlement needs to connect the top of the steel tube concrete pile with the bottom of the raft 3; The specific process of correcting the forced landing on the side with smaller settlement is as follows: First, the steel tube concrete pile is pressed to the target position of the operation pit. After the pile is pressed, a jack 5 is placed on the top of the steel tube concrete pile to virtually cover the raft 3. Coal 6 is placed in the coal mixing bunker 1 at a position corresponding to the side with smaller settlement. The remaining positions are vacant. Under the gravity of the coal 6, the composite foundation on the side with smaller settlement produces vertical settlement, and the raft 3 is in tight contact with the jack 5. The jack 5 is stressed. Then all the jacks 5 are simultaneously depressurized to the designed height, and the composite foundation further vertically settles, so that the raft 3 is in tight contact with the jack 5. The process of depressurizing the jack 5 and vertical settlement of the composite foundation is repeated until the composite foundation settles to the target height and stops forced landing. The height of each descent of the jack 5 is carried out according to the pre-designed height, and the amount of descent is as small as possible each time to avoid the structural impact of the ground mixed coal bunker 1 caused by a large amount of descent. The descent is carried out on the principle of low descent and multiple times until the overall descent reaches the designed height; Step 3, after all static pressure piles are replaced, cement slurry is poured around the static pressure piles to form a reinforcement layer. The thickness of the reinforcement layer is not more than half of the distance between two adjacent static pressure piles to avoid interference between the two reinforcement layers and cause problems of inconsistent wall thickness. A number of anchor rods are arranged at equal intervals in the reinforcement layer and along its circumference. By setting the anchor rods, the reinforcement layer can be further reinforced, thereby improving the bearing capacity of the entire pile foundation and increasing its service life. The operation pit is then backfilled, and the reinforcement and anti-sinking work is completed.

[0030] Static pressure piles are used to reinforce the composite foundation to prevent the mixed coal bunker from continuing to sink. Forced landing correction is used to return the coal bunker's inclination rate to the standard limit. Jacks are used to temporarily support the load of the building, and then space for forced landing is reserved. The part that needs forced landing is lowered to a specified height and then the load-bearing capacity is restored, so that the correction speed and amount can be accurately controlled during the correction process. The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. The method for reinforcing and correcting the deviation of the mixed coal bunker is characterized by: Follow the steps below to implement it: Step 1: excavate an operation pit at the location of the coal-mixing bunker composite foundation (2) where static pile underpinning is to be performed according to the design requirements; Step 2, using steel tube concrete piles to replace static piles in the composite foundation (2), first replacing the static piles on the side with larger settlement, and after the reinforcement and settlement arrest on the side with larger settlement is completed, forced landing and deviation correction work is carried out on the side with smaller settlement, and after the forced landing and deviation correction on the side with smaller settlement is completed, static pile underpinning work is carried out; Step 3: After all static pressure piles are replaced, backfill the operation pit and the reinforcement and anti-sinking work is completed.

2. The method for reinforcing and correcting the mixed coal bunker according to claim 1 is characterized in that: In step 2, the static pile underpinning on the side with greater settlement requires that the top of the steel tube concrete pile be connected to the bottom of the raft slab (3).

3. The method for reinforcing and correcting the deviation of a mixed coal bunker according to claim 1 is characterized in that: In step 2, the specific process of forced landing and deviation correction work on the side with smaller settlement is as follows: first, the steel tube concrete pile is pressed to the target position of the operation pit. After the pile is pressed, a jack (5) and a virtual top raft (3) are placed on the top of the steel tube concrete pile, and then forced landing and deviation correction are carried out.

4. The method for reinforcing and correcting the deviation of a mixed coal bunker according to claim 3 is characterized in that: The specific process of forced landing correction is as follows: coal (6) is placed in the coal mixed bunker (1) at a position corresponding to the side with smaller settlement, and the other positions are vacant. Under the gravity of the coal (6), the composite foundation on the side with smaller settlement produces vertical settlement, the raft (3) and the jack (5) are in tight contact, the jack (5) is stressed, and then all the jacks (5) are simultaneously depressurized to the designed height, and the composite foundation further vertically settles, so that the raft (3) and the jack (5) are in tight contact. The process of jack (5) depressurization and vertical settlement of the composite foundation is repeated until the composite foundation settles to the target height and the forced landing is stopped.

5. The method for reinforcing and correcting the deviation of a mixed coal bunker according to claim 1 is characterized in that: In step 2, the static pile underpinning on the side with smaller settlement needs to connect the top of the steel tube concrete pile with the bottom of the raft slab (3).

6. The method for reinforcing and correcting the deviation of a mixed coal bunker according to claim 1 is characterized in that: The number of static pressure piles arranged on the side with smaller settlement shall not be greater than the number of static pressure piles arranged on the side with larger settlement.

7. The method for reinforcing and correcting the deviation of a mixed coal bunker according to claim 1 is characterized in that: In step 3, after all static piles are replaced, cement slurry is poured around the static piles to form a reinforcement layer.

8. The method for reinforcing and correcting the deviation of a mixed coal bunker according to claim 7 is characterized in that: The thickness of the reinforcement layer is not greater than half of the distance between two adjacent static pressure piles.

9. The method for reinforcing and correcting the deviation of a mixed coal bunker according to claim 7, characterized in that: A plurality of anchor rods are arranged in the reinforcement layer at equal intervals along its circumference.

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