Prestressed pile sealing device and construction method thereof

Abstract

The present invention relates to a prestressed pile sealing device and a construction method thereof. The prestressed pile sealing device includes a building foundation and an anchor pile. A base is fixed above the anchor pile. A spring device is provided on the base. The spring device includes an outer sleeve and a through bolt and a first compression spring provided inside the outer sleeve. The first compression spring is sleeved on the outside of the through bolt. An anchor rod is provided inside the building foundation. A load-bearing steel plate is provided on the top of the first compression spring. The load-bearing steel plate is fixed on the top of the anchor rod. The two ends of the through bolt are respectively fixed on the base and the load-bearing steel plate. The present invention can realize the application of prestress at any time without waiting for the age of concrete, which saves a lot of construction time. The use of the spring device can also improve the seismic performance of the building. During the operation stage of the building, the prestress can be inspected and flexibly adjusted at any time, so as to realize the monitoring and feedback of the prestress of the building foundation throughout its life cycle.

Description

Technical Field

[0001] The present invention relates to the field of underground building pile foundations, and more particularly to a prestressed pile sealing device and a construction method thereof. Background Art

[0002] Pile foundations are widely used due to their high bearing capacity, minimal settlement, excellent seismic resistance, and ability to address the bearing capacity of specialized foundation soils. When pile foundations exhibit quality defects or their bearing capacity falls short of design requirements, foundation reinforcement is necessary. Anchor piles can be constructed in confined spaces and are suitable for projects where large equipment is inaccessible. They also offer rapid and stable settlement, facilitating installation speeds, making them widely used in pile reinforcement projects.

[0003] Generally, no prestress is applied to anchor pile sealing. However, in order to obtain higher mechanical properties such as bending resistance, shear resistance and crack resistance, some anchor piles also adopt prestressed pile sealing technology.

[0004] Traditional prestressed pile sealing is achieved using a reaction frame and jacks. First, the reaction frame is installed on the foundation. Then, a force-transfer steel section is placed atop the last anchor pile section and welded to the anchor pile. Once the last anchor pile section is complete, the jack is placed on the force-transfer steel section and prestressing begins until the design requirements are met. After prestressing is complete, the jack remains active to stabilize the pressure while micro-expansive early-strength concrete is poured into the anchor pile hole. The jack and reaction frame are removed only when the concrete strength reaches the design requirements.

[0005] Traditional pile sealing methods require a large number of jacks and reaction frames because the jacks are constantly in operation for a long time. This results in significant waste of materials and equipment, and a prolonged construction period. Furthermore, after the concrete for the pile seal is poured, the connection between the anchor pile head and the foundation becomes rigid, making it impossible to re-apply prestress to the anchor piles during the subsequent construction phase. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a prestressed pile sealing device and a construction method thereof, which eliminates the use of reaction frames and jacks and makes construction more convenient.

[0007] The technical solution adopted by the present invention to solve its technical problems is: constructing a prestressed pile sealing device, including a building foundation and an anchor pile, a base is fixed above the anchor pile, and a spring device is provided on the base, the spring device includes an outer sleeve and a through bolt and a first compression spring arranged inside the outer sleeve, the first compression spring is sleeved on the outside of the through bolt, an anchor rod is provided in the building foundation, a load-bearing steel plate is provided on the top of the first compression spring, the load-bearing steel plate is fixed on the top of the anchor rod, and the two ends of the through bolt are respectively fixed on the base and the load-bearing steel plate.

[0008] According to the above solution, the load-bearing steel plate is fixed on the anchor rod by fastening nuts and nut washers.

[0009] According to the above solution, the two ends of the through bolt are respectively fixed to the base and the load-bearing steel plate by tightening nuts and nuts.

[0010] According to the above solution, a pile sealing cover plate is provided above the load-bearing steel plate, and the pile sealing cover plate is fixed on the foundation of the building.

[0011] According to the above solution, the base is fixed to the top of the anchor pile by bonding or welding.

[0012] According to the above solution, the gap between the outer sleeve and the anchor pile hole is filled with fine stone concrete or grouting material.

[0013] According to the above solution, a second compression spring is installed on the anchor rod, and the second compression spring is located below the load-bearing steel plate.

[0014] The present invention also provides a construction method of a prestressed pile sealing device, comprising the following steps:

[0015] Step 1: During the construction of the building foundation, anchor rods are pre-buried or implanted on the building foundation. When the foundation construction is completed and reaches the design strength, anchor piles are constructed in the anchor pile holes reserved on the cap or raft slab;

[0016] Step 2: After the last section of the anchor pile is constructed, apply structural adhesive to the top of the anchor pile, and then glue or weld the base to the top of the anchor pile;

[0017] Step 3: After the foundation is installed, you can start pouring the gap between the outer sleeve and the anchor pile hole;

[0018] Step 4: After the concrete is poured, install the second compression spring on the anchor rod and install the load-bearing steel plate. After the load-bearing steel plate is installed, install the nut washer and fastening nut on the anchor rod and screw rod;

[0019] Step 5: After the fastening nuts are installed, tighten the fastening nuts on the anchor rod and the through bolt. According to the design requirements and the scale on the fastening nuts, calculate the number of turns the fastening nuts need to be rotated, and gradually tighten all the fastening nuts to the predetermined scale. At this point, the first compression spring and the second compression spring enter the pressurized working state;

[0020] Step 6: Install the pile cover plate on the bearing steel plate and completely seal it;

[0021] Step 7: Finally, construct the building floor and cover it with pile sealing cover.

[0022] The implementation of the prestressed pile sealing device and the construction method thereof of the present invention has the following beneficial effects:

[0023] This invention allows prestressing to be applied at any time without waiting for the concrete to age, saving significant material and construction time. Furthermore, the use of spring devices can improve the building's seismic resistance. During the building's operational phase, the prestressing force can be flexibly adjusted based on operational requirements, enabling monitoring and feedback of prestressing throughout the building foundation's lifecycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0025] Figure 1 This is a schematic diagram of anchor static pressure pile;

[0026] Figure 2 Schematic diagram of the spring device;

[0027] Figure 3 This is a schematic diagram of the welding of the spring device and the anchor pile;

[0028] Figure 4 Schematic diagram of the top bearing steel plate;

[0029] Figure 5 Schematic diagram of the prestressed pile sealing device. DETAILED DESCRIPTION

[0030] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0031] like Figure 1-5As shown, the prestressed pile sealing device of the present invention includes a building foundation 1 and an anchor pile 2. The building foundation 1 is a cap or raft slab. A base 7 is fixed above the anchor pile 2, and a spring device is provided on the base 7. The spring device includes an outer sleeve 10, a through-bolt 9 disposed within the outer sleeve 10, and a first compression spring 8. The first compression spring 8 is sleeved on the outside of the through-bolt 9. An anchor rod 3 is provided within the building foundation 1. A load-bearing steel plate 11 is provided on top of the first compression spring 8. The load-bearing steel plate 11 is fixed to the top of the anchor rod 3. The through-bolt 9 has its ends fixed to the base 7 and the load-bearing steel plate 11, respectively.

[0032] Preferably, the load-bearing steel plate 11 is fixed to the anchor rod 3 by fastening the nut 5 and the nut washer 6 .

[0033] Preferably, both ends of the through bolt 9 are fixed to the base 7 and the bearing steel plate 11 by tightening the nut 5 and the nut respectively.

[0034] Preferably, a pile sealing cover plate 13 is provided above the bearing steel plate 11 , and the pile sealing cover plate 13 is fixed on the building foundation 1 .

[0035] Preferably, the base 7 is fixed to the top of the anchor pile 2 by bonding or welding.

[0036] Preferably, the gap between the outer sleeve 10 and the hole of the anchor pile 2 is filled with fine stone concrete or grouting material 12.

[0037] Preferably, a second compression spring 4 is installed on the anchor rod 3 , and the second compression spring 4 is located below the load-bearing steel plate 11 .

[0038] Preferably, the first compression spring 8 in this embodiment is a high-pressure ratio spring with a very high spring constant, capable of generating tens to hundreds of kilonewtons of force with minimal compression. The tightening nut 5 at the top of the through-bolt 9 has a corresponding scale. The specific amount of spring compression can be calculated by the number of turns of the tightening nut 5, achieving precise control of the spring force.

[0039] Preferably, the base 7 is tightly bonded to the top of the last anchor pile 2 by welding or applying structural adhesive, so as to achieve effective force transmission.

[0040] Preferably, an annular outer sleeve 10 is provided on the outside of the first compression spring 8 , and the outer sleeve 10 is welded to the base 7 . The sleeve 10 is slightly higher than the base or raft to prevent concrete, construction water or other debris from entering the sleeve 10 .

[0041] Preferably, a common second compression spring 4 is inserted into the pre-buried or implanted anchor rod 3 on the bearing platform, which is used to coordinate and synchronize the compression amount of the first compression spring 8 to facilitate the construction of the fastening nut 5.

[0042] Preferably, the pile sealing cover plate 13 is a stainless steel cover plate with a galvanized anti-corrosion coating on its surface and is embedded in the raft or the base to a certain depth to ensure that the pressure spring device is isolated from the outside world, so that the external environment of the pressure spring device is stable when it is in working state and the spring device has strong durability.

[0043] The present invention also provides a construction method of a prestressed pile sealing device, comprising the following construction steps:

[0044] Step 1: During the construction of the cap or raft slab of the building foundation 1, anchor rods 3 are pre-buried or implanted on the cap or raft slab. After the foundation construction is completed and reaches the design strength, anchor piles 2 are installed in the anchor pile holes 2 reserved in the cap or raft slab.

[0045] Step 2: After the last section of the anchor pile 2 is constructed, apply structural adhesive to the top of the anchor pile 2, and then stick the base 7 to the top of the anchor pile 2. If it is a new project, the base 7 of the spring device can be directly welded to the top of the anchor pile 2.

[0046] Step 3: After the spring device is installed, you can start pouring the gap between the outer sleeve 10 and the anchor pile 2 holes. Because this space is small, it is appropriate to pour fine stone concrete or grouting material 12.

[0047] Step 4: After the concrete pouring is completed, the second compression spring 4 can be installed on the pre-buried or implanted anchor rod 3, and the load-bearing steel plate 11 can be installed on the top of the spring device. After the load-bearing steel plate 11 is installed, the nut washer 6 and the fastening nut 5 can be installed on the anchor rod 3 and the screw rod.

[0048] Step 5: After the fastening nuts 5 are installed, use an electric wrench to tighten the fastening nuts 5 on the anchor rod 3 and the through bolt 9. According to the design requirements and the scale on the fastening nuts 5, calculate the number of turns the fastening nuts 5 need to be rotated, and gradually tighten all the fastening nuts 5 to the predetermined scale. At this point, the spring device enters the pressurized working state.

[0049] Step 6: Install the galvanized anti-corrosion coating on the pile cover plate 13 and completely seal it on the spring device. To achieve a good sealing effect, the stainless steel cover plate needs to be embedded into the raft or the platform to a certain depth to ensure that the pressure spring device is isolated from the outside world. This ensures that the external environment of the pressure spring device is stable when it is in operation, and the spring device is more durable.

[0050] Step 7: Finally, construct the building floor and cover the pile sealing cover plate 13.

[0051] The present invention has the following advantages:

[0052] The present invention realizes the application of prestress through a spring device installed on the top of the last section of the anchor pile, avoids the use of reaction frames and jacks, makes construction more convenient, and also saves a lot of materials and construction time. After the spring device enters the normal working state, a stainless steel cover plate coated with a galvanized anti-corrosion coating is installed on the top of the spring device to completely isolate the spring device from the external environment. In order to achieve a good sealing effect, the stainless steel cover plate needs to be embedded in the raft or the base to a certain depth to ensure that the external environment of the pressure spring device is stable when it is in working state, and the spring device is more durable. In addition, during the normal use stage of the building, the spring device can be opened again for maintenance at any time, and the nut can be tightened or loosened according to the use requirements to flexibly adjust the prestressing size, so as to realize the monitoring and feedback of the prestressing of the building foundation throughout its life cycle.

[0053] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are protected by the present invention.

Claims

1. A prestressed pile sealing device, comprising a building foundation and an anchor pile, characterized in that: A base is fixed above the anchor pile, and a spring device is provided on the base. The spring device includes an outer sleeve, a through bolt and a first compression spring arranged inside the outer sleeve. The first compression spring is sleeved on the outside of the through bolt. An anchor rod is provided in the building foundation. A load-bearing steel plate is provided on the top of the first compression spring. The load-bearing steel plate is fixed on the top of the anchor rod. Two ends of the through bolt are respectively fixed to the base and the load-bearing steel plate. The load-bearing steel plate is fixed to the anchor rod by a fastening nut and a nut washer. The two ends of the through bolt are respectively fixed to the base and the load-bearing steel plate by a fastening nut and a nut washer. A second compression spring is installed on the anchor rod. The second compression spring is located below the load-bearing steel plate. The first compression spring is a high-pressure ratio spring.

2. The prestressed pile sealing device according to claim 1, characterized in that: A pile sealing cover plate is provided above the load-bearing steel plate, and the pile sealing cover plate is fixed on the building foundation.

3. The prestressed pile sealing device according to claim 1, characterized in that: The base is fixed to the top of the anchor pile by bonding or welding.

4. The prestressed pile sealing device according to claim 1, characterized in that: The gap between the outer sleeve and the anchor pile hole is filled with fine stone concrete or grouting material.

5. A construction method for the prestressed pile sealing device according to claim 1, characterized in that: The steps include: Step 1: During the construction of the building foundation, anchor rods are pre-buried or implanted on the building foundation. When the foundation construction is completed and reaches the design strength, anchor piles are constructed in the anchor pile holes reserved on the cap or raft slab; Step 2: After the last section of the anchor pile is constructed, apply structural adhesive to the top of the anchor pile, and then glue or weld the base to the top of the anchor pile; Step 3: After the foundation is installed, you can start pouring the gap between the outer sleeve and the anchor pile hole; Step 4: After the concrete is poured, install the second compression spring on the anchor rod and then install the load-bearing steel plate. After the load-bearing steel plate is installed, install the nut washer and the fastening nut on the anchor rod and the through bolt; Step 5: After the fastening nuts are installed, tighten the fastening nuts on the anchor rod and the through bolt. According to the design requirements and the scale on the fastening nuts, calculate the number of turns the fastening nuts need to be rotated, and gradually tighten all the fastening nuts to the predetermined scale. At this point, the first compression spring and the second compression spring enter the pressurized working state; Step 6: Install the pile cover plate on top of the bearing steel plate and completely seal it; Step 7: Finally, construct the building floor and cover it with pile sealing cover.

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