CN117488779A - Assembled reinforcement cage anti-floating device and construction method - Google Patents

Abstract

The application relates to the technical field of bored pile construction, and particularly discloses an assembled reinforcement cage anti-floating device and a construction method, wherein the reinforcement cage anti-floating device comprises a support rod, an inclined strut, a plurality of connecting rods, a plurality of fixing rods and a multidirectional connecting joint for detachably connecting the connecting rods and the fixing rods to the support rod; the sleeve is sleeved on the support rod in a sliding manner, the sliding block is sleeved on the connecting rod in a sliding manner, one end of the diagonal brace is hinged to the sleeve, the other end of the diagonal brace is hinged to the sliding block, and one end, far away from the support rod, of the fixing rod is fixedly connected to the reinforcement cage. Under the impact of the drop hammer, the sleeve moves downwards along the supporting rod, the inclined supporting rod drives the sliding block to slide along the connecting rod and insert into the soil layer, so that the anchoring of the reinforcement cage is realized, and the operation is simple and convenient; because this application adopts assembled structure, through selecting parts such as connecting rod, dead lever that use length to be different, make this application can be applicable to not unidimensional steel reinforcement cage.

Description

An assembled steel cage anti-floating device and construction method

Technical field

This application relates to the technical field of bored pile construction, and in particular to an assembled steel cage anti-floating device and a construction method.

Background technique

Bored cast-in-place piles are currently a commonly used pile type in construction projects. They have the advantages of large single pile bearing capacity and strong shear and bending resistance. During construction, holes are dug with a drill, and after cleaning the holes, prefabricated steel cages are placed in the pile holes, and finally concrete is poured into the piles. During the concrete pouring process, the steel cage often floats. The factors causing this phenomenon include: incomplete cleaning of the sediment at the bottom of the drill hole before lowering the steel cage, unreasonable concrete pouring speed, and substandard quality of the steel cage itself. Since it is difficult to restore the steel cage to its original position through subsequent remedial measures after the steel cage floats, the steel bars at the bottom of the cast-in-place pile are missing, resulting in a decrease in the overall load-bearing capacity of the cast-in-place pile, seriously affecting the construction quality of the project.

To deal with the problem of steel cages floating, traditional methods include: welding "barbs" on the main bars of the steel cages, setting up anti-floating structures such as fixed anchor points, underground fixed anchor cables, increasing loads, and inspecting the steel cages at the pile mouth. Mechanical reinforcement and other methods. Welding "barbs" on the steel cage may cause the welding of the main bars of the steel cage to break, reducing the overall strength and stability of the steel cage structure. Some anti-floating structures are complex in design and processing, and are inconvenient to adjust according to the different pile diameters of the steel cages. Mechanical reinforcement methods require fixing clamps on the main bars and reinforcing bars, and some require adding counterweights. However, the gap between the holes and the steel cage at the construction site is generally small, making fixing the clamps extremely inconvenient and complicated the construction.

Contents of the invention

In order to improve the problem that the current construction method to prevent the steel cage from floating is complicated and difficult to apply to steel cages with different pile diameters, this application provides a prefabricated steel cage anti-floating device and construction method.

An assembled steel cage anti-floating device provided by this application adopts the following technical solution:

An assembled steel cage anti-floating device, including:

The support rod is parallel to the axial direction of the steel cage, and a sleeve is slidably connected to the support rod;

A plurality of connecting rods are connected to the support rod, the connecting rods are arranged along the radial direction of the steel cage, and the connecting rods are slidably sleeved with sliders;

A diagonal support rod with one end hinged to the sleeve and the other end hinged to the slider;

A plurality of fixed rods connected to the support rods, the fixed rods are arranged along the radial direction of the steel cage, and one end of the fixed rods away from the support rods is fixedly connected to the steel cage;

A connecting piece is used to detachably connect the connecting rod and the fixed rod to the support rod.

During construction, the anti-floating device is fixedly connected to the steel cage through a fixed rod, the steel cage is lowered into the drill hole, and then a falling hammer is used to hit the end of the support rod, so that the diagonal support rod pushes the slider to slide along the connecting rod. The slider is inserted into the soil layer to achieve anchoring between the steel cage and the soil layer. This application adopts a prefabricated structure, and components such as support rods, connecting rods, diagonal braces, and fixed rods are all detachable, so that components of different sizes can be selected according to different sizes of steel cages to meet different construction needs.

Further, the connecting piece is a multi-directional connection joint, including a longitudinal threaded sleeve and a plurality of transverse threaded sleeves fixed to the longitudinal threaded sleeve, and the plurality of transverse threaded sleeves are arranged around the axis of the longitudinal threaded sleeve in sequence. Distributed, the longitudinal threaded sleeve is threadedly connected to the support rod, and the transverse threaded sleeve is threadedly connected to the connecting rod or the fixed rod.

The support rods, connecting rods and fixed rods are all threaded to the multi-directional connection joints, making disassembly and assembly easy; on the other hand, by rotating the support rods, connecting rods and fixed rods, the multi-directional connection joints can be extended to them The length can be adjusted to better meet construction needs.

Further, there are four connecting rods, and the angle between two adjacent connecting rods is 90°.

The greater the number of connecting rods, the more stable the anchorage between the steel cage and the soil layer. However, increasing the number of connecting rods will also increase the cost and extend the construction time. Using four connecting rods can ensure the connection between the steel cage and the soil layer. The anchoring effect between them is also conducive to controlling costs and construction time.

Further, a string is connected between the two opposite slide blocks; under the impact of the falling weight, the two opposite slide blocks move away from each other, causing the string to break.

Under the gravity of the sleeve itself, the two opposite sliders tend to move away from each other. The thin rope is connected between the two sliders, restricting the two sliders from moving away from each other, so that during the lowering process of the steel cage, the slide blocks The block is located in the steel cage and is not in contact with the soil layer, which facilitates the lowering of the steel cage; when the steel cage is lowered to a suitable position, use a drop hammer to hit the sleeve, and the two slide blocks will move away from each other to break the string, and the string will The limiting effect of the slider is released, and the slider can be inserted into the soil layer.

Further, there are four fixed rods, and the four fixed rods are distributed sequentially around the axis of the steel cage.

The greater the number of fixed rods, the more stable the connection between the anti-floating device and the steel cage. However, increasing the number of fixed rods will also increase the cost and extend the construction time. Using four fixed rods can ensure the connection between the anti-floating device and the steel cage. The connection effect is also conducive to controlling costs and construction time.

Furthermore, spikes are provided on one side of the slide block close to the soil layer.

On the one hand, the spikes help the slider to insert into the soil layer smoothly; on the other hand, the resistance between the spikes and the soil layer prevents the steel cage from floating up.

Further, one or more spikes are provided, and the spikes are conical or pyramidal.

According to different hole wall soil layer properties, sliders with different shapes of spikes can be selected to meet different construction needs and improve the applicability of this application.

Furthermore, welding is used between the fixed rod and the steel cage.

The equipment required for welding is simple and easy to operate. The connection between the anti-floating device and the steel cage can be easily realized at the construction site.

Further, a top plate for the falling weight to be struck is fixed at one end of the sleeve away from the support rod.

The top plate increases the contact area between the end of the sleeve and the falling weight. On the one hand, it facilitates the impact of the falling weight. On the other hand, it also makes the force on the sleeve more uniform, which is conducive to the smooth downward movement of the sleeve.

This application also provides an assembled steel cage anti-floating construction method, which includes the following steps:

(1) Drill and clear holes in the soil layer, and make appropriate steel cages according to the hole diameter and hole depth;

(2) Select prefabricated connecting rods, fixed rods, support rods, diagonal braces and sleeves of appropriate length according to the size of the steel cage;

(3) Connect the connecting rod, fixed rod, and support rod to the multi-directional connecting joint respectively, set the slider on the connecting rod, and connect the string between the two opposite sliders;

(4) Set the sleeve on the support rod, and use the diagonal support rod to connect the sleeve and the slider;

(5) Weld and fix the fixed rod and the steel cage to complete the installation of the anti-floating device;

(6) Lower the steel cage equipped with the anti-floating device to the bottom of the drill hole;

(7) Use a falling hammer to hit the roof, causing the slider to slide along the connecting rod and insert into the soil layer to complete the anchoring of the steel cage; the depth of the slider inserted into the soil layer can be estimated based on the distance between the roof plate and the ground before and after hitting;

(8) Pour concrete into piles.

To sum up, this application includes at least one of the following beneficial technical effects:

1. This application uses a falling hammer to anchor the slider to the soil layer of the hole wall. It is easy to operate and can effectively prevent the steel cage from floating up;

2. Each component of this application can be assembled and manufactured at low cost, and the equipment required for on-site installation and construction is simple;

3. This application can be applied to bored piles with different apertures and various geological conditions. Prefabricated components of different sizes (connecting rods, fixed rods, diagonal braces, etc.) can be selected according to the aperture size, and selected according to the properties of the soil layers of different hole walls. Sliders with spikes of different shapes are used to assemble anti-floating devices that meet the needs of corresponding projects.

Description of drawings

Figure 1 is a schematic structural diagram of the steel cage anti-floating device installed in the steel cage in the embodiment of the present application;

Figure 2 is a schematic diagram of the overall structure of the steel cage anti-floating device in the embodiment of the present application;

Figure 3 is a schematic structural diagram of the steel cage during anti-floating construction in the embodiment of the present application.

Reference symbols: 1-Longitudinal bars; 2-Stirrups; 3-Sleeves; 4-Support rods; 5-Diagonal brace rods; 6-Connecting rods; 7-Sliders; 8-Fixed rods; 9-Multidirectional connections Joint; 10-bolt; 11-drop weight; 12-hole wall; 13-soil layer; 14-thin rope; 15-roof plate.

Detailed ways

The present application will be further described in detail below in conjunction with Figures 1-3.

Example 1

Referring to Figure 1, the steel cage includes a plurality of longitudinal bars 1 arranged in parallel along the drilling depth direction and annular stirrups 2 connected between the plurality of longitudinal bars 1.

The embodiment of the present application discloses an assembled steel cage anti-floating device. Referring to Figures 1 and 2, the assembled steel cage anti-floating device includes a support rod 4, a plurality of connecting rods 6 and a plurality of fixed rods 8. The support rod 4 is parallel to the axial direction of the steel cage, and the sliding sleeve on the support rod 4 A sleeve 3 is connected, and a disc-shaped top plate 15 is fixed at the end of the sleeve 3. The diameter of the top plate 15 is larger than the diameter of the sleeve 3.

Referring to Figures 1 and 2, a plurality of connecting rods 6 arranged along the radial direction of the steel cage are connected to the support rod 4, and the connecting rods 6 are slidably sleeved with sliders 7. An oblique support rod 5 is connected between the sleeve 3 and the slider 7 . One end of the oblique support rod 5 is hinged to the sleeve 3 through bolts 10 , and the other end is hinged to the slider 7 through bolts 10 . A plurality of fixed rods 8 arranged along the radial direction of the steel cage are connected to the support rod 4, and one end of the fixed rod 8 away from the support rod 4 is welded to the longitudinal bar 1 of the steel cage. The assembled steel cage anti-floating device also includes connectors for detachably connecting the connecting rod 6 and the fixed rod 8 to the support rod 4.

Specifically, referring to Figure 2, the connector is a multi-directional connection joint 9, which includes a longitudinal thread sleeve and a plurality of transverse thread sleeves fixed to the longitudinal thread sleeve; in this embodiment, eight transverse thread sleeves are provided, and multiple transverse thread sleeves are provided. The transverse thread sleeves are distributed sequentially around the axis of the longitudinal thread sleeve. The longitudinal threaded sleeve is threadedly connected to the support rod 4, and the transverse threaded sleeve is threadedly connected to the connecting rod 6 or the fixed rod 8; in order to facilitate disassembly and assembly, the support rod 4, the connecting rod 6 and the fixed rod 8 are all provided with wrench grooves.

During construction, refer to Figures 1 and 3, and weld the ends of the fixed rods 8 to the longitudinal bars 1 of the steel cage. The equipment required for welding is simple and easy to operate. The anti-floating device and the steel cage can be easily connected at the construction site. connect. Lower the steel cage with the anti-floating device installed into the drill hole, and then use the drop hammer 11 to hit the top plate 15 at the end of the sleeve 3. The top plate 15 increases the contact area between the end of the sleeve 3 and the drop hammer 11. On the one hand, It is convenient for the hammer 11 to hit, and on the other hand, it also makes the force of the sleeve 3 more uniform, which is beneficial to the smooth downward movement of the sleeve 3. The sleeve 3 moves downward so that the diagonal support rod 5 pushes the slider 7 to slide along the connecting rod 6, and the slider 7 is inserted into the soil layer 13 to achieve anchoring between the steel cage and the soil layer 13.

This application adopts an assembled structure. The support rods 4, connecting rods 6 and fixed rods 8 are all threaded to the multi-directional connection joint 9. The disassembly and assembly operation is convenient, so that components of different sizes can be selected according to different sizes of steel cages. To meet different construction needs. On the other hand, by rotating the support rod 4, the connecting rod 6 and the fixed rod 8, the length of the multi-directional connecting joint 9 can be adjusted to better meet construction needs.

Further, referring to Figure 2, four connecting rods 6 are provided, and the angle between two adjacent connecting rods 6 is 90°, that is, the four connecting rods 6 are arranged in a "cross" shape. There are four fixed rods 8 arranged in order around the axis of the steel cage, and the four fixed rods 8 are arranged in an "X" shape.

The greater the number of connecting rods 6, the more stable the anchoring between the steel cage and the soil layer 13; the greater the number of fixed rods 8, the more stable the connection between the anti-floating device and the steel cage. However, increasing the number of connecting rods 6 and fixed rods 8 will also lead to increased costs and prolonged construction time; selecting four connecting rods 6 and four fixed rods 8 can ensure the stability of the connection between the anti-floating device and the steel cage and the stability of the steel cage. The anchoring effect with the soil layer 13 is also conducive to controlling costs and construction time.

Referring to Figures 1 and 2, a string 14 is connected between the two opposite sliders 7, and the string 14 can be a nylon rope.

Under the gravity of the sleeve 3 itself, the two opposite sliders 7 tend to move away from each other. The string 14 is connected between the two sliders 7 so that the outermost ends of the two sliders 7 are located in the steel cage. At the edge, the string 14 is tightened but not broken at this time, so that during the lowering process of the steel cage, the slider 7 does not contact the soil layer 13, which facilitates the lowering of the steel cage in the borehole. After the steel cage is lowered to a suitable position, the drop weight 11 is used to hit the sleeve 3. The two slide blocks 7 move away from each other and the string 14 is stretched and broken, and the limiting effect of the string 14 on the slide block 7 is released. 7 can be inserted into the soil layer 13.

In order to facilitate the insertion of the slider 7 into the soil layer 13, referring to Figures 2 and 3, spikes are provided on the side of the slider 7 close to the soil layer 13. The number of spikes can be set to one or more, and the shape of the spikes can be set to a cone or a pyramid.

On the one hand, the spikes help the slider 7 to insert into the soil layer 13 smoothly; on the other hand, the resistance between the spikes and the soil layer 13 can prevent the steel cage from floating up. According to the different properties of the soil layer 13, the slider 7 with spikes of different shapes can be selected to meet different construction needs and improve the applicability of the present application.

The implementation principle of the assembled steel cage anti-floating device in this embodiment is as follows: during construction, the fixed rod 8 is welded to the steel cage, so that the anti-floating device is fixedly connected to the steel cage; the steel cage is lowered into the drilled hole, and then Use the falling weight 11 to hit the top plate 15 at the end of the sleeve 3, so that the diagonal support rod 5 pushes the slider 7 to slide along the connecting rod 6, and the slider 7 is inserted into the soil layer 13 to achieve anchoring between the steel cage and the soil layer 13. . This application adopts an assembled structure. The support rods 4, connecting rods 6, diagonal braces 5, fixed rods 8 and other components can be easily disassembled and assembled, so that components of different sizes can be selected according to different steel cage sizes to meet different construction requirements. need.

Example 2

The embodiment of the present application provides a construction method for preventing floating of a prefabricated steel cage, which includes the following steps:

(1) Carry out drilling operations according to the pile position, hole diameter and hole depth required by the design, clean the holes, and make a suitable steel cage according to the hole diameter and hole depth;

(2) Select prefabricated connecting rods 6, fixed rods 8, support rods 4, diagonal braces 5 and sleeves 3 of appropriate length according to the size of the steel cage; according to the different properties of the soil layer 13, select spikes with appropriate shapes. slider7;

(3) Thread the connecting rod 6, fixed rod 8, and support rod 4 with the multi-directional connecting joint 9 respectively, set the slider 7 on the connecting rod 6, and connect the string 14 to the two opposite sliders 7 time, so that the outermost ends of the two sliders 7 are located at the inner edge of the steel cage;

(4) Set the sleeve 3 on the support rod 4, and hinge the two ends of the diagonal support rod 5 to the sleeve 3 and the slider 7 respectively through bolts 10. At this time, the top of the sleeve 3 is higher than the top of the support rod 4. , so that the sleeve 3 has room to continue to move downward;

(5) Weld and fix the end of the fixed rod 8 with the longitudinal bar 1 of the steel cage to complete the installation of the anti-floating device;

(6) Lower the steel cage equipped with the anti-floating device to the bottom of the drill hole;

(7) Lower the hanging hammer line to measure the distance from the top plate 15 to the ground, record it as the initial distance; then use the drop weight 11 to hit the top plate 15, so that the sleeve 3 slides downward along the support rod 4, and at the same time the diagonal support rod 5 pushes the sliding The block 7 slides along the connecting rod 6 and is inserted into the soil layer 13; measure the distance between the top plate 15 and the ground again, and compare it with the initial distance to estimate the distance the sleeve 3 has moved downward and the depth of the slider 7 inserted into the hole wall 12; When the top plate 15 slides down to the top of the support rod 4 or the sliding displacement of the sleeve 3 changes very little after multiple hammerings, stop hammering. At this time, the steel cage has been anchored in the soil layer 13;

(8) Clean the holes and pour concrete into piles.

The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application shall be covered by the scope of protection of the present application. Inside.

Claims (10)

1. An assembled steel cage anti-floating device, characterized by: including: The support rod is parallel to the axial direction of the steel cage, and a sleeve is slidably connected to the support rod; A plurality of connecting rods are connected to the support rod, the connecting rods are arranged along the radial direction of the steel cage, and the connecting rods are slidably sleeved with sliders; A diagonal support rod with one end hinged to the sleeve and the other end hinged to the slider; A plurality of fixed rods connected to the support rods, the fixed rods are arranged along the radial direction of the steel cage, and one end of the fixed rods away from the support rods is fixedly connected to the steel cage; A connecting piece is used to detachably connect the connecting rod and the fixed rod to the support rod. 2. An assembled steel cage anti-floating device according to claim 1, characterized in that: the connecting piece is a multi-directional connecting joint, including a longitudinal thread sleeve and a plurality of longitudinal thread sleeves fixed to the longitudinal thread sleeve. Transverse thread sleeves, a plurality of transverse thread sleeves are sequentially distributed around the axis of the longitudinal thread sleeve, the longitudinal thread sleeve is threadedly connected to the support rod, the transverse thread sleeve is connected to the connecting rod or the fixed rod Threaded connection. 3. An assembled steel cage anti-floating device according to claim 1, characterized in that four connecting rods are provided, and the angle between two adjacent connecting rods is 90°. 4. An assembled steel cage anti-floating device according to claim 3, characterized in that: a string is connected between the two opposite slide blocks; under the impact of the falling weight, the two opposite slide blocks The slide blocks move away from each other to cause the string to break. 5. An assembled steel cage anti-floating device according to claim 1, characterized in that four fixed rods are provided, and the four fixed rods are sequentially distributed around the axis of the steel cage. 6. An assembled steel cage anti-floating device according to claim 1, characterized in that: the side of the slider close to the soil layer is provided with spikes. 7. An assembled steel cage anti-floating device according to claim 6, characterized in that: one or more spikes are provided, and the spikes are conical or pyramidal. 8. An assembled steel cage anti-floating device according to claim 1, characterized in that: the fixed rod and the steel cage are welded. 9. An assembled steel cage anti-floating device according to claim 1, characterized in that: the end of the sleeve away from the support rod is fixedly connected with a top plate for the falling weight to strike. 10. A construction method for prefabricated steel cages to prevent floating, characterized in that: adopting a prefabricated steel cage anti-floating device according to any one of claims 1 to 9, including the following steps: (1) Drill and clear holes in the soil layer, and make appropriate steel cages according to the hole diameter and hole depth; (2) Select prefabricated connecting rods, fixed rods, support rods, diagonal braces and sleeves of appropriate length according to the size of the steel cage; (3) Connect the connecting rod, fixed rod, and support rod to the multi-directional connecting joint respectively, set the slider on the connecting rod, and connect the string between the two opposite sliders; (4) Set the sleeve on the support rod, and use the diagonal support rod to connect the sleeve and the slider; (5) Weld and fix the fixed rod and the steel cage to complete the installation of the anti-floating device; (6) Lower the steel cage equipped with the anti-floating device to the bottom of the drill hole; (7) Use a falling hammer to hit the roof, causing the slider to slide along the connecting rod and insert into the soil layer to complete the anchoring of the steel cage; the depth of the slider inserted into the soil layer can be estimated based on the distance between the roof plate and the ground before and after hitting; (8) Pour concrete into piles.