Foundation anchor rod static pressure pile reinforced raft overhanging construction method

Abstract

The application discloses a foundation anchor rod static pressure pile reinforced raft overhanging construction method, comprising the following steps: S1, positioning a line at the ground beam of a building to determine the drilling position of a connecting hole on the ground beam; S2, performing hole drilling construction on the drilling position; S3, performing indoor raft construction indoors of the building and overhanging raft construction outdoors of the building, wherein the overhanging raft is connected to the indoor raft; S4, performing anchor rod static pressure pile pile pressing construction in a reserved pile hole of the overhanging raft. A plurality of spaced connecting holes are formed on the ground beam, so that the overhanging raft can be connected to the indoor raft through the connecting holes; and because the ground beam is reserved with a ground beam transverse reserved part and a ground beam upper part reserved part, the ground beam can meet the load transmission requirement of the upper structure of the building. The application slightly disturbs the original structure of the building and has the advantages of low cost and short construction period.

Description

Technical Field

[0001] This invention relates to the field of building structure reinforcement technology, and in particular, to a method for reinforcing raft slab extensions with foundation anchor static pressure piles. Background Technology

[0002] In the construction of old building renovation and structural reinforcement projects, the foundation has problems such as moderate liquefaction of the ground and uneven settlement. In order to solve these problems, anchor static pressure piles are added under the foundation around the vertical components and an integral raft slab is set in the foundation. According to the structural requirements, part of the raft slab needs to extend out to the outside through the ground beam, while providing the pile reaction force of the static pressure piles on the perimeter of the foundation.

[0003] When constructing the raft slab extension, the exterior walls are load-bearing walls. To protect the original building, the exterior walls cannot be removed to relieve stress. The common construction method is to erect a complete support system for the exterior walls and superstructure before construction, and then carry out a complex process of "removing and jacking up simultaneously" for the raft slab extension. This process causes significant disturbance to the original structure throughout, and not only has prominent problems such as high safety risks, large costs, and long construction periods. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method for reinforcing raft slab extensions with foundation anchor static pressure piles.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] A method for reinforcing raft slab extensions with foundation anchor static pressure piles includes the following steps:

[0007] S1. Locate and lay out lines at the ground beam of the building to determine the drilling positions for the connecting holes on the ground beam;

[0008] S2. Drill holes at the specified drilling locations;

[0009] S3. Indoor raft slab construction is carried out inside the building, and outdoor raft slab construction is carried out outside the building, wherein the outdoor raft slab passes through the connecting hole and is connected to the indoor raft slab.

[0010] S4. Perform static pressure pile driving construction of anchor bolts in the reserved pile holes of the extended raft slab;

[0011] The ground beam has multiple connecting holes arranged in parallel, and a transverse reserved portion of the ground beam is formed between adjacent connecting holes. The ground beam also has an upper reserved portion above several of the connecting holes.

[0012] Preferably, the connecting hole is formed by drilling with a water drill.

[0013] Preferably, in step S3, both the indoor raft slab and the extended raft slab are formed by casting concrete after being tied with reinforcing bars.

[0014] Preferably, the reinforcing bars of the extended raft slab have a reinforced structure.

[0015] Preferably, the height of the connecting hole is adapted to be greater than the thickness of the extended raft slab, thereby forming an observation interval; in step S4, the pile driving stress of the extended raft slab is determined by observing the observation interval, and the pile driving construction is stopped when the observation interval decreases.

[0016] Preferably, the extended raft slab is located at the corner of the ground beam of the building, and the connecting holes are provided on the adjacent sides of the ground beam.

[0017] Preferably, step S4 further includes driving anchor static pressure piles into the reserved pile holes of the indoor raft slab.

[0018] Preferably, the observation interval is 4-6 cm.

[0019] Preferably, after the connecting holes are opened, a connecting channel is opened from the side of the ground beam, and the connecting channel is located above the connecting holes; an installation channel communicating with the connecting channel is opened on the top surface of the connecting holes, and then a monitoring cylinder is installed in the installation channel, the monitoring cylinder being adapted to bounce vertically; the connecting channel is filled with fluid, and an alarm bladder is installed at the port of the connecting channel; when the observation interval decreases, the monitoring cylinder is compressed, causing the fluid in the connecting channel to fill the alarm bladder, and the alarm bladder expands to indicate abnormal stress conditions of the pile driving.

[0020] Preferably, after the pile driving construction is completed, the alarm bladder is removed, and fluid is injected into the connecting channel so that the monitoring cylinders are kept in the ejected position under positive pressure. Then, a plug is inserted into the port of the connecting channel to maintain the positive pressure of the fluid in the connecting channel.

[0021] The beneficial effects of this invention are as follows: By opening several spaced-apart connection holes in the ground beam, the extended raft slab can pass through these holes and connect to the indoor raft slab. Because the ground beam retains both a transverse and an upper portion, it can meet the load transfer requirements of the building's superstructure, thus eliminating or reducing the need for a complete support system for the exterior walls and superstructure before construction. This invention causes minimal disturbance to the original building structure and has the advantages of low cost and short construction period. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a single-layer planar structure in an embodiment;

[0023] Figure 2 This is a schematic diagram of the extended facade structure of an embodiment;

[0024] Figure 3 This is a schematic diagram of the two-layer planar structure of an embodiment;

[0025] Figure 4 This is a schematic diagram of the observation spacing structure;

[0026] Figure 5 This is a schematic diagram of the monitoring cylinder.

[0027] Attached reference numerals: 1. Outward-extending raft slab; 2. Indoor raft slab; 3. Reserved pile hole; 4. Horizontal beam; 5. Longitudinal beam; 6. Reinforcing beam; 7. Beam 1; 8. Precast slab; 9. Beam 2; 10. Exterior wall; 11. Exterior window; 12. Connection hole; 13. Observation spacing; 14. Lateral retained portion; 15. Upper retained portion of ground beam; 16. Reinforced structure; 17. Connection channel; 18. Installation channel; 19. Monitoring cylinder; 20. Alarm chamber. Detailed Implementation

[0028] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] See Figures 1 to 4 A method for reinforcing raft slab extensions with static pressure piles and foundation anchors includes the following steps:

[0030] S1. Locate and lay out lines at the ground beam of the building to determine the drilling position of the connecting hole 12 on the ground beam.

[0031] S2. Drill holes at the drilling locations, for example, by drilling the connecting holes 12 using a water drill. Specifically, multiple connecting holes 12 are drilled side by side on the ground beam, with a transverse retaining portion 14 of the ground beam formed between adjacent connecting holes 12, and an upper retaining portion 15 of the ground beam formed above several connecting holes 12.

[0032] S3. The indoor raft slab 2 is constructed inside the building, and the outdoor raft slab 1 is constructed outside the building, wherein the outdoor raft slab 1 is connected to the indoor raft slab 2 through the connecting hole 12.

[0033] In some examples, the reinforcement of the indoor raft slab 2 can be tied indoors, and the reinforcement of the extended raft slab 1 can be tied in the connecting holes 12. Finally, the connected indoor raft slab 2 and the extended raft slab 1 are formed by concrete pouring. Preferably, a reinforcement structure 16 can be added to the tied reinforcement of the extended raft slab 1 to make the cast-in-place strength of the extended raft slab 1 higher.

[0034] In a possible example, the indoor raft slab 2 and the outward raft slab 1 can be precast concrete components, and a mechanical connection structure can be set between them to achieve connection.

[0035] S4. The static pressure piles of anchor rods are driven into the reserved pile holes 3 in the extended raft 1. Alternatively, the pile holes 3 can also be reserved in the indoor raft 2, and the static pressure piles of anchor rods can be driven into the reserved pile holes 3 in the indoor raft 2. After the pile driving is completed, the piles can be filled with grout.

[0036] It is understandable that the presence of the horizontal portion 14 and the upper portion 15 of the ground beam on the building's ground beam enables the ground beam to meet the load transfer requirements of the building's superstructure, thereby eliminating or reducing the need to construct a complete support system for the exterior wall 10 and the superstructure before construction.

[0037] For example, the ground beam can be formed by a frame structure enclosed by crossbeams 4 and longitudinal beams 5, and reinforcing beams 6 can be set within the frame structure to increase the overall strength of the beam. The extended raft slab 1 is preferably set at the corner of the ground beam (that is, at the intersection of crossbeams 4 and longitudinal beams 5), which allows connecting holes 12 to be opened on both crossbeams 4 and longitudinal beams 5. Thus, the crossbeams 4 and longitudinal beams 5 can share the area of ​​the protruding holes required for the extended raft slab 1, making the overall strength of the ground beam less susceptible to being affected.

[0038] In some embodiments, the height of the connecting hole 12 can be designed to be greater than the thickness of the extended raft plate 1, so that an observation gap 13 is formed between the extended raft plate 1 and the top surface of the connecting hole 12. For example, the observation gap 13 can be designed to be 4-6 cm. Preferably, the observation gap 13 can be 5 cm.

[0039] During the execution of S4, especially when driving piles into the cantilever raft slab 1, construction personnel can monitor the observation interval 13. If the observation interval 13 is found to decrease, pile driving can be stopped immediately to prevent the cantilever raft slab 1 from colliding with the upper ground beam and causing damage to the building structure. For example, the pile driving reaction force can be increased by stacking loads on the cantilever raft slab 1 to meet the design pile driving requirements, and the piles can be filled and compacted with grout after the pile driving is completed.

[0040] In a preferred example, after the connecting hole 12 is opened, a connecting channel 17 can be opened from the side of the ground beam, such as the side of the longitudinal beam 5 or the transverse beam 4. Specifically, when the extended raft 1 is set at the corner of the ground beam, the two connecting channels 17 can intersect and be connected, and a plug is provided at the end of one of the connecting channels 17.

[0041] from Figure 5 As can be seen, the connecting channel 17 is located above several connecting holes 12, and each connecting hole 12 has a mounting channel 18 connected to the corresponding connecting channel 17 on its top surface. A monitoring cylinder 19, which can spring vertically via a spring or other elastic element, can then be installed within the mounting channel 18. Next, the connecting channel 17 can be filled with fluids such as water, pure water, or hydraulic oil, and an alarm bladder 20 can be installed at the port of the connecting channel 17.

[0042] During normal pile driving, the monitoring cylinder 19 does not contact the extended raft 1, or the monitoring cylinder 19 remains in a relatively constant protruding position, and the size of the alarm bladder 20 is also relatively constant. At this time, it can be determined that the stress on the extended raft 1 is normal. However, when an abnormal stress occurs, the observation interval 13 will decrease, and the extended raft 1 will squeeze the monitoring cylinder 19 to contract. This will force the fluid in the connecting channel 17 into the alarm bladder 20, and then the alarm bladder 20 will collide to indicate an abnormal pile driving.

[0043] The alarm capsule 20 can intuitively indicate whether the pile driving operation is normal, and it is less likely that the construction personnel will neglect to measure the observation spacing 13 in time, resulting in the failure to detect the pile driving abnormality in time.

[0044] After the pile driving construction is completed, the construction personnel can remove the alarm bladder 20 and further fill the connecting channel 17 with fluid, creating positive pressure within the channel. During this process, several monitoring cylinders 19 will remain in their protruding positions, contacting the extended raft slab 1, as the positive pressure gradually increases. This fills the gaps in the observation spacing 13, thereby improving the overall strength of the ground beam. Subsequently, plugs can be inserted into the ports of the connecting channel 17 to maintain positive pressure within it.

[0045] In a possible example, curing adhesive can be filled into the connection channel 17. The curing adhesive can remain fluid in the initial stage of injection, thereby pushing out the monitoring cylinder 19. Under certain conditions, such as a certain time or after the partition wall is heated, the curing adhesive can be cured to provide better strength between the ground beam and the monitoring cylinder 19.

[0046] For example, a connecting pipe can be installed in the connecting channel 17, while an installation pipe attached to the connecting pipe can be installed in the installation channel 18. The plug and alarm bladder 20 can be detachably installed at the end of the connecting pipe by means of a threaded connection.

[0047] The above description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A method for constructing a raft foundation extension reinforced with static pressure piles with anchor bolts, characterized in that: Includes the following steps: S1. Locate and lay out lines at the ground beam of the building to determine the drilling position of the connecting hole (12) on the ground beam; S2. Drill holes at the specified drilling locations; S3. The construction of an indoor raft slab (2) is carried out inside the building, and the construction of an outdoor raft slab (1) is carried out outside the building, wherein the outdoor raft slab (1) is connected to the indoor raft slab (2) through the connecting hole (12). S4. The static pressure pile driving construction of anchor bolts is carried out in the reserved pile hole (3) of the extended raft slab (1); The ground beam has multiple connecting holes (12) arranged in parallel, and a transverse retaining portion (14) of the ground beam is formed between adjacent connecting holes (12). The ground beam also has an upper retaining portion (15) above several connecting holes (12).

2. The method for constructing a raft foundation extension reinforced with static pressure piles according to claim 1, characterized in that: The connecting hole (12) is formed by drilling.

3. The method for constructing a raft foundation extension reinforced with static pressure piles according to claim 1, characterized in that: in The indoor raft slab (2) and the extended raft slab (1) in S3 are both formed by pouring concrete after being tied with steel bars.

4. The method for constructing a raft foundation extension reinforced with static pressure piles according to claim 3, characterized in that: The tying steel bars of the extended raft slab (1) have a reinforced structure (16).

5. The method for constructing a raft foundation extension reinforced with static pressure piles according to any one of claims 1-4, characterized in that: The height of the connecting hole (12) is adapted to be greater than the thickness of the extended raft plate (1), thereby forming an observation spacing (13); In S4, the pile driving force of the extended raft slab (1) is determined by observing the observation interval (13). When the observation interval (13) decreases, the pile driving construction is stopped.

6. The method for constructing a raft foundation extension reinforced with static pressure piles according to any one of claims 1-4, characterized in that: The extended raft slab (1) is located at the corner of the ground beam of the building, and the connecting hole (12) is provided on the adjacent side of the ground beam.

7. The method for constructing a raft foundation extension reinforced with static pressure piles according to claim 1, characterized in that: The S4 also includes the construction of anchor static pressure piles in the reserved pile holes (3) of the indoor raft (2).

8. The method for constructing a raft foundation extension reinforced with static pressure piles according to claim 5, characterized in that: The observation interval (13) is 4-6 cm.

9. The method for constructing a raft foundation extension reinforced with static pressure piles according to claim 5, characterized in that: in After the connecting hole (12) is opened, a connecting channel (17) is opened from the side of the ground beam, and the connecting channel (17) is located above a plurality of the connecting holes (12); An installation channel (18) communicating with the connection channel (17) is opened on the top surface of the connection hole (12), and a monitoring cylinder (19) is then installed in the installation channel (18). The monitoring cylinder (19) is adapted to be able to bounce vertically. The connecting channel (17) is filled with fluid, and an alarm bladder (20) is provided at the port of the connecting channel (17); When the observation interval (13) decreases, the monitoring cylinder (19) is compressed, causing the fluid in the connecting channel (17) to fill the alarm bladder (20), and the alarm bladder (20) expands to indicate the abnormal stress condition of the pile driving.

10. The method for constructing a raft foundation extension reinforced with static pressure piles according to claim 9, characterized in that: After the pile driving construction is completed, the alarm bladder (20) is removed, and fluid is injected into the connecting channel (17) so that several monitoring cylinders (19) are kept in the ejected position under positive pressure. Then, a plug is inserted into the port of the connecting channel (17) to maintain the positive pressure of the fluid in the connecting channel (17).

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