An auxiliary installation device for improving the stability of a reinforcement cage of a cast-in-place pile and a construction method

Abstract

The application discloses a kind of auxiliary installation device and construction method for improving the stability of bored pile reinforcement cage in the field of pile foundation construction auxiliary device, the device includes horizontal base ring, several cross bracing rods are outwardly arranged on base ring along radial direction, several longitudinal bracing rods are vertically connected on the outer wall of base ring, sleeve is arranged on longitudinal bracing rod;Positioning ring and adjusting ring are arranged on cross bracing rod, mounting block is slidably arranged between positioning ring and adjusting ring, sliding groove is formed in the lower surface of mounting block along the radial direction of base ring, guard plate is arranged in sliding groove, guard plate includes vertical plate and horizontal plate, bracing plate assembly is arranged on the outer wall of vertical plate.By the auxiliary installation device and construction method of the application, the construction efficiency of the lap joint construction between upper and lower reinforcement cages is improved, the compression resistance, tensile strength and bending strength of the lap joint of reinforcement cage are improved, the activity of reinforcement cage during concrete pouring is avoided, the concrete pouring quality is improved, and the device is suitable for use in concrete bored pile foundation construction.

Description

Technical Field

[0001] This invention relates to the field of auxiliary devices for pile foundation construction, and in particular to an auxiliary installation device and construction method for improving the stability of the reinforcing cage of cast-in-place piles. Background Technology

[0002] Cast-in-place piles refer to piles formed in the foundation by means of mechanical drilling, steel pipe extrusion, or manual excavation on the engineering site, and then a steel cage is placed in the hole and concrete is poured in. Depending on the hole formation method, cast-in-place piles can be divided into several categories such as driven cast-in-place piles, drilled cast-in-place piles, and excavated cast-in-place piles. They are widely used in construction, municipal roads, bridges and other engineering projects.

[0003] During the construction of bored piles, the concrete pouring method differs from that of ordinary piles. The concrete is poured through a guide pipe to the bottom of the pile and then poured upwards. During this upward pouring process, the concrete exerts an upward force on the reinforcing cage, causing it to float. However, in normal construction, no anti-buoyancy measures are often taken. Typically, after the reinforcing cage floats, it is simply adjusted manually, but this method is insufficient to push the cage back to its original design position. Since the reinforcing cage primarily serves as a tensile reinforcement and support, and concrete has high compressive strength but low tensile strength, the reinforcing cage constrains the pile concrete, enabling it to withstand a certain axial tensile force. Therefore, the floating or movement of the reinforcing cage will significantly affect the circumferential tensile strength of the pile concrete and the overall strength of the bored pile.

[0004] To address this, an auxiliary installation device is proposed to improve the stability of the reinforcing cage in cast-in-place piles, ensuring that the reinforcing cage does not float during concrete pouring and thus guaranteeing its stability. Summary of the Invention

[0005] The purpose of this invention is to overcome the defects in the prior art and provide an auxiliary installation device and construction method for improving the stability of the reinforcing cage in cast-in-place piles. During the concrete pouring process, the reinforcing cage is stably fixed inside the cast-in-place pile, preventing the reinforcing cage from floating during the concrete pouring process and improving the circumferential tensile strength of the concrete cast-in-place pile.

[0006] The objective of this invention is achieved as follows: An auxiliary installation device for improving the stability of a cast-in-place pile reinforcement cage includes a horizontal base ring. Several horizontal support rods are arranged radially outward on the base ring. Several longitudinal support rods are vertically connected to the outer wall of the base ring, and sleeves are fitted onto the longitudinal support rods. Positioning rings and adjusting rings are provided on the horizontal support rods. An installation block is slidably provided between the positioning rings and adjusting rings. A groove is formed on the lower surface of the installation block radially along the base ring. A protective wall plate is provided within the groove. The protective wall plate includes a vertical plate and a horizontal plate. A support plate assembly is provided on the outer wall of the vertical plate.

[0007] Furthermore, the support plate assembly includes a connecting rod radially disposed on the outer wall of the vertical plate along the base ring. A compression spring is fixedly connected to the end of the connecting rod, and an outer sleeve is connected to the outside of the compression spring. One end of the outer sleeve is open and fitted onto the end of the connecting rod, and the other end is connected to a rubber top block.

[0008] Furthermore, the connecting rod is provided with scale lines, and the outer sleeve has a fastening screw hole that penetrates the outer sleeve wall.

[0009] Furthermore, a locking bolt for the horizontal plate passes through the lower surface of the horizontal plate. When the wall panel is locked, the locking bolt is screwed in so that the end of the locking bolt advances upwards onto the lower surface of the mounting block for locking.

[0010] Furthermore, the sleeve comprises a lower mounting sleeve and an upper mounting sleeve, with the lower mounting sleeve and the upper mounting sleeve respectively fitted onto the lower and upper ends of the longitudinal support rod in opposite directions. The sidewall of the sleeve is provided with several transverse holes opened radially along the sleeve, and fastening bolts are screwed into the transverse holes. The top of the longitudinal support rod extends beyond the upper edge of the base ring. The sidewalls of the lower mounting sleeve and the upper mounting sleeve are provided with several through grooves circumferentially, and the through grooves are arranged alternately from top to bottom.

[0011] Furthermore, a horizontal tie rod is provided between the adjacent lower mounting sleeves.

[0012] Furthermore, the sleeve comprises a first connecting sleeve with a closed top and an open bottom, and a second connecting sleeve with a closed bottom and an open top, disposed on the side of the first connecting sleeve and connected to the first connecting sleeve. The top of the first connecting sleeve extends beyond the upper edge of the base ring. A welding groove is provided at the junction of the first connecting sleeve and the second connecting sleeve. Both the first connecting sleeve and the second connecting sleeve have slots on their cylinder walls.

[0013] Furthermore, all the cross braces are threaded rods, and the inner walls of the positioning ring and the adjusting ring are provided with threads that are compatible with the cross braces. The mounting block is provided with threaded holes that correspond to the threads on the cross braces. The positioning ring, the adjusting ring and the mounting block are slidably screwed onto the cross braces through threaded connections.

[0014] Furthermore, the mounting block and the protective wall are provided with counterweights.

[0015] The present invention also provides a construction method for an auxiliary installation device for improving the stability of a cast-in-place pile reinforcement cage. Using the aforementioned auxiliary installation device for improving the stability of a cast-in-place pile reinforcement cage, the specific method includes the following steps: The base ring and its supporting and stabilizing devices are lifted using a hoisting device. Multiple outer sleeves are simultaneously squeezed inward according to the diameter of the pile hole, compressing the compression spring at the end of the connecting rod inward, causing the rubber top block to move towards the inside of the base ring. Then, the installation sleeve of this device is aligned with the main reinforcement of the steel cage and slowly lowered. The main reinforcement of the steel cage is slowly and one by one inserted into the installation sleeve. Finally, the position of the main reinforcement of the steel cage is locked by the fastening bolts, and the rubber top block is released so that the rubber top block supports the inner wall of the pile hole to prevent the hole from collapsing. Counterweights are set on the installation block and the protective plate to apply vertical downward foundation pressure to the steel cage to prevent the steel cage from floating or moving during the concrete pouring process.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: the top of the pile hole wall is supported by the horizontal base ring and the protective plate set below the base ring to avoid hole collapse. The counterweight hung on the protective plate can apply vertical downward foundation pressure to the steel cage, preventing the steel cage from floating or moving during the concrete pouring process, improving the stability of the steel cage, and thus ensuring the strength of the cast-in-place pile body. It is suitable for use in the construction of cast-in-place pile foundations. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 .

[0018] Figure 2 for Figure 1 Enlarged structural diagram at point A in the middle.

[0019] Figure 3 This is a schematic diagram of the structure of the present invention. Figure 2 .

[0020] Figure 4 This is a schematic diagram of the installation structure of the first sleeve and the second sleeve in this invention.

[0021] Among them, 1 is the base ring, 2 is the horizontal support rod, 3 is the vertical support rod, 4 is the upper mounting sleeve, 5 is the horizontal hole, 6 is the positioning ring, 7 is the adjusting ring, 8 is the mounting block, 9 is the sliding groove, 10 is the wall plate, 11 is the connecting rod, 12 is the lower mounting sleeve, 13 is the outer sleeve, 14 is the rubber top block, 15 is the first connecting sleeve, 16 is the second connecting sleeve, 17 is the horizontal tie rod, 18 is the through groove, 19 is the hole, 20 is the vertical plate, 21 is the horizontal plate, and 22 is the welding groove. Detailed Implementation Example

[0022] like Figures 1-4An auxiliary installation device for improving the stability of a cast-in-place pile reinforcement cage is shown, comprising a horizontal base ring 1, a plurality of horizontal support rods 2 arranged radially outward on the base ring 1, a plurality of vertical support rods 3 vertically connected to the outer wall of the base ring 1, and sleeves fitted on the vertical support rods 3; positioning rings 6 and adjusting rings 7 are provided on the horizontal support rods 2, and mounting blocks 8 are slidably provided between the positioning rings 6 and adjusting rings 7; a sliding groove 9 is opened on the lower surface of the mounting block 8 radially along the base ring 1, and a protective wall plate 10 is provided in the sliding groove 9; the protective wall plate 10 includes a vertical plate 20 and a horizontal plate 21, and a support plate assembly is provided on the outer wall of the vertical plate 20.

[0023] The support plate assembly includes a connecting rod 11 radially arranged on the outer wall of the vertical plate 20 along the base ring 1. A compression spring is fixedly connected to the end of the connecting rod 11. An outer sleeve 13 is connected to the outside of the compression spring. One end of the outer sleeve 13 is open and fitted onto the end of the connecting rod 11, and the other end is connected to a rubber top block 14.

[0024] The connecting rod 11 is equipped with scale lines, and the outer sleeve 13 has a fastening screw hole that penetrates the inner wall of the outer sleeve 13. The scale lines facilitate the calculation of the length that the outer sleeve 13 should be compressed before hoisting and then the compression is precise. After the compression spring is compressed to the length that can be smoothly inserted into the pile foundation pit opening, the position of the outer sleeve 13 is locked by using the fastening screw hole and fastening bolt, thereby preventing the outer sleeve 13 from rebounding under the action of the compression spring, which simplifies the construction operation and facilitates subsequent construction.

[0025] A locking bolt is provided on the lower surface of the horizontal plate 21. When the wall panel 10 is locked, the locking bolt is screwed in so that the end of the locking bolt advances upward to the lower surface of the mounting block 8 for locking.

[0026] The sleeve consists of a lower mounting sleeve 12 and an upper mounting sleeve 4. The lower mounting sleeve 12 and the upper mounting sleeve 4 are respectively fitted onto the lower and upper ends of the longitudinal support rod 3 in opposite directions. The side wall of the sleeve has several transverse holes 5 opened radially along the sleeve, and fastening bolts are screwed into the transverse holes 5. The top of the longitudinal support rod 3 extends beyond the upper edge of the base ring 1. The side walls of the lower mounting sleeve 12 and the upper mounting sleeve 4 have several through grooves 18 circumferentially opened, and the through grooves 18 are staggered from top to bottom. In this embodiment, the inner diameter of the lower mounting sleeve 12 is consistent with the outer diameter of the main reinforcement of the steel cage, which facilitates the overlapping of the upper and lower steel cages. In some cases, the auxiliary installation device must be removed after the concrete in the lower part of the pile foundation pit has initially set. However, when it is necessary to splice the piles, the lower installation sleeve 12 and the upper installation sleeve 4 in the auxiliary installation device of this invention can be used to quickly align the two adjacent steel cages. During the splicing, the lower installation sleeve 12 and the upper installation sleeve 4 are welded to the main bars of the upper and lower steel cages respectively through the through groove 18. The fastening bolts for locking the steel bars are used to ensure that the tensile strength, compressive strength and bending strength at the connection of the main bars of the upper and lower steel cages meet the design standards, thus ensuring the quality of the steel cage splicing.

[0027] A horizontal tie bar 17 is also provided between adjacent lower mounting sleeves 12; the horizontal tie bar 17 can effectively increase the radial compressive strength of the mounting sleeve or longitudinal support rod 3, and prevent the main reinforcement of the steel cage from bending laterally due to the influence of the rubber top block 14, the wall plate 10 and the counterweight block 8, so as to ensure that the steel cage maintains a normal shape.

[0028] All cross braces 2 are threaded rods. The inner walls of the positioning ring 6 and the adjusting ring 7 are provided with threads that are compatible with the cross braces 2. The mounting block 8 is provided with threaded holes that correspond to the threads on the cross braces 2. The positioning ring 6, the adjusting ring 7 and the mounting block 8 are slidably screwed onto the cross braces 2 through threaded connection. The mounting block 8 and the wall plate 10 are provided with counterweights.

[0029] The present invention also provides a construction method for an auxiliary installation device for improving the stability of a cast-in-place pile reinforcement cage. Using the aforementioned auxiliary installation device for improving the stability of a cast-in-place pile reinforcement cage, the specific method includes the following steps: The base ring 1 and the supporting and stabilizing device on the base ring 1 are lifted by a hoisting device. Multiple outer sleeves 13 are simultaneously squeezed inward according to the diameter of the pile foundation hole, and the compression spring at the end of the connecting rod 11 is compressed inward, so that the rubber top block 14 moves towards the inside of the base ring 1. Then, the installation sleeve of this device is aligned with the main reinforcement of the steel cage and then slowly lowered. The main reinforcement of the steel cage is slowly and correspondingly inserted into the installation sleeve. Finally, the position of the main reinforcement of the steel cage is locked by the fastening bolts, and the rubber top block 14 is released so that the rubber top block 14 supports the inner wall of the pile foundation hole to prevent the hole from collapsing. Counterweights are set on the installation block 8 and the protective plate 10 to apply vertical downward foundation pressure to the steel cage to prevent the steel cage from floating or moving during the concrete pouring process.

[0030] For foundation pits with suitable borehole diameters, the support plate assembly can be omitted. The position of the mounting block 8 can be adjusted directly using the positioning ring 6 and adjusting ring 7, followed by locking the mounting block 8. The position of the retaining wall plate 10 within the groove 9 on the lower surface of the mounting block 8 can be adjusted. Then, the locking bolt is screwed in, with its end protruding upwards onto the lower surface of the mounting block 8 for locking. This fixes the retaining wall plate 10 in place, directly abutting against the inner wall of the borehole, thus achieving the function of wall protection. After locking the retaining wall plate 10, a counterweight is placed on the mounting block 8 or the retaining wall plate 10. This applies vertical downward foundation pressure to the reinforcing cage before concrete pouring, preventing the reinforcing cage from floating or rotating during concrete pouring and effectively improving the quality of the concrete pouring. Example

[0031] This embodiment provides another method for installing the sleeve, such as... Figure 3 , 4As shown, the longitudinal support rod 3, the upper mounting sleeve 4, and the lower mounting sleeve 12 are replaced with a first connecting sleeve 15 with a closed top and an open bottom, and a second connecting sleeve 16 with a closed bottom and an open top, which is located on the side of the first connecting sleeve 15 and connected to the first connecting sleeve 15. The top of the first connecting sleeve 15 extends beyond the upper edge of the base ring 1. A welding groove 22 is provided at the junction of the first connecting sleeve 15 and the second connecting sleeve 16. A slotted hole 19 is provided on the cylinder wall of both the first connecting sleeve 15 and the second connecting sleeve 16. Specifically, when rebar cage lap splicing is required, the main reinforcement bars of the lower rebar cage are connected to the auxiliary installation device of the present invention by inserting the first connecting sleeve 15, and the upper rebar cage is connected to the auxiliary installation device of the present invention by inserting the second connecting sleeve 16. Preliminary welding is then performed through the slot 19 to fix the main reinforcement bars of the upper and lower rebar cages to the auxiliary installation device of the present invention. Finally, the ends of the main reinforcement bars of the upper and lower rebar cages are firmly lapped through the welding groove 22, thereby meeting the requirement in the construction standard that the lap length is greater than ten times the diameter of the main reinforcement bar, ensuring that the connection strength between the upper and lower rebar cages meets the specifications. During the construction process of lap splicing the upper and lower rebar cages, the positioning ring 6, adjusting ring 7, installation block 8, and wall plate 10 can be removed from the cross brace 2 to avoid affecting subsequent concrete pouring. The base ring 1, the first connecting sleeve 15 fixed on the base ring 1, and the second connecting sleeve 16 can be retained as connectors between the upper and lower rebar cages, which can effectively improve the construction efficiency of the lap splicing construction between the upper and lower rebar cages and enhance the compressive, tensile, and bending strength of the rebar cage lap joint.

[0032] This invention is not limited to the above embodiments. Based on the technical solutions disclosed in this invention, those skilled in the art can make some substitutions and modifications to some of the technical features without creative effort, and all such substitutions and modifications are within the protection scope of this invention.

Claims

1. An auxiliary installation device for improving the stability of a cast-in-place pile reinforcement cage, characterized in that: The device includes a horizontal base ring, on which several horizontal struts are arranged radially outward. Several vertical struts are vertically connected to the outer wall of the base ring, and sleeves are fitted onto the vertical struts. The horizontal struts are provided with positioning rings and adjusting rings. An installation block is slidably provided between the positioning rings and adjusting rings. The lower surface of the installation block is provided with a groove radially along the base ring. A protective wall plate is provided in the groove. The protective wall plate includes a vertical plate and a horizontal plate. A support plate assembly is provided on the outer wall of the vertical plate. The sleeve consists of a lower mounting sleeve and an upper mounting sleeve. The lower mounting sleeve is fitted onto the lower end and the upper end of the longitudinal support rod in opposite directions. The side wall of the sleeve has several transverse holes opened radially along the sleeve. Fastening bolts are screwed into the transverse holes. The top of the longitudinal support rod extends beyond the upper edge of the base ring. The side walls of the lower mounting sleeve and the upper mounting sleeve have several through grooves circumferentially opened. The through grooves are staggered from top to bottom. A transverse tie rod is also provided between adjacent lower mounting sleeves.

2. The auxiliary installation device for improving the stability of the reinforcing cage of a cast-in-place pile according to claim 1, characterized in that: The support plate assembly includes a connecting rod arranged radially along the base ring on the outer wall of the vertical plate. A compression spring is fixedly connected to the end of the connecting rod, and an outer sleeve is connected to the outside of the compression spring. One end of the outer sleeve is open and fitted onto the end of the connecting rod, and the other end is connected to a rubber top block.

3. The auxiliary installation device for improving the stability of the reinforcing cage of a cast-in-place pile according to claim 2, characterized in that: The connecting rod is provided with scale lines, and the outer sleeve has a fastening screw hole that penetrates the outer sleeve wall.

4. The auxiliary installation device for improving the stability of the reinforcing cage of a cast-in-place pile according to claim 1, characterized in that: The lower surface of the horizontal plate is provided with a locking bolt. When the wall panel is locked, the locking bolt is screwed in so that the end of the locking bolt advances upward into the lower surface of the mounting block for locking.

5. The auxiliary installation device for improving the stability of the reinforcing cage of a cast-in-place pile according to claim 1, characterized in that: The sleeve consists of a first connecting sleeve with a closed top and an open bottom, and a second connecting sleeve with an open top and a closed bottom, which is disposed on the side of the first connecting sleeve and connected to the first connecting sleeve. The top of the first connecting sleeve extends beyond the upper edge of the base ring. A welding groove is provided at the junction of the first connecting sleeve and the second connecting sleeve. Both the first connecting sleeve and the second connecting sleeve have slots on their cylinder walls.

6. The auxiliary installation device for improving the stability of the reinforcing cage of a cast-in-place pile according to claim 1, characterized in that: All the cross braces are threaded rods. The inner walls of the positioning ring and the adjusting ring are provided with threads that are compatible with the cross braces. The mounting block is provided with threaded holes that correspond to the threads on the cross braces. The positioning ring, the adjusting ring and the mounting block are slidably screwed onto the cross braces through threaded connection.

7. The auxiliary installation device for improving the stability of the reinforcing cage of a cast-in-place pile according to claim 1, characterized in that: The mounting block and the protective wall are equipped with counterweights.

8. A construction method for an auxiliary installation device to improve the stability of a cast-in-place pile reinforcement cage, characterized in that... The auxiliary installation device for improving the stability of the reinforcing cage of a cast-in-place pile, as described in claims 1-7, includes the following steps: The base ring and the supporting and stabilizing device on the base ring are lifted by a lifting device; multiple outer sleeves are simultaneously squeezed inward according to the diameter of the pile hole; the compression spring at the end of the connecting rod is compressed inward, causing the rubber top block to move towards the inside of the base ring; the installation sleeve of this device is aligned with the main reinforcing bar of the reinforcing cage and then slowly lowered; the main reinforcing bars of the reinforcing cage are slowly and correspondingly inserted into the installation sleeve; finally, the position of the main reinforcing bars of the reinforcing cage is locked by fastening bolts; the rubber top block is released, allowing the rubber top block to support the inner wall of the pile hole to prevent collapse; counterweights are set on the installation block and the protective plate to apply vertical downward foundation pressure to the reinforcing cage, preventing the reinforcing cage from floating or moving during concrete pouring.

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