Foundation pit trestle plate under pile foundation structure and construction method thereof

Abstract

This invention relates to the technical field of pile foundation construction under a foundation pit trestle slab, specifically a pile foundation construction and construction method for a foundation pit trestle slab, comprising: a sleeve, with expansion grooves formed around the inner wall of the sleeve, an expansion sleeve inserted into the expansion grooves, a cover plate connected to the top of the expansion sleeve, a second hinge shaft hinged around the bottom of the cover plate, an extension bearing plate connected to the second hinge shaft, and a connecting slot formed at the bottom of the outer end of the extension bearing plate; the beneficial effect is that the pile foundation construction and construction method for a foundation pit trestle slab proposed in this invention first involves opening a reserved hole in the foundation pit trestle slab, and after the foundation pit trestle slab is constructed, the sleeve is inserted into the reserved hole, and the conical head at the bottom of the sleeve is inserted into the soil at the bottom of the foundation pit trestle slab, while the insertion of the conical head is reinforced by the reinforcing anchor at the bottom of the reinforcing ring set at the top of the sleeve.

Description

Technical Field

[0001] This invention relates to the field of pile foundation construction technology under a foundation pit trestle slab, specifically to a pile foundation construction method under a foundation pit trestle slab. Background Technology

[0002] With the continuous development of urban underground space, trestle decks are often used as construction platforms and material transportation channels in deep foundation pit projects. Traditional construction methods require that pile foundation engineering must be completed before the installation of trestle decks.

[0003] However, due to changes in geological conditions, design changes, unqualified existing pile foundation testing, or the discovery of insufficient local bearing capacity during construction, when additional engineering piles need to be driven under the existing trestle deck, the traditional method requires the removal of part of the trestle deck, resulting in high costs and long construction periods.

[0004] Therefore, we provide a construction method for the pile foundation under the foundation pit trestle slab to avoid the impact of trestle slab removal on the construction period and reduce construction costs. Summary of the Invention

[0005] The purpose of this invention is to provide a pile foundation structure under a foundation pit trestle slab and its construction method to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a sleeve, wherein a telescopic groove is formed around the inner wall of the sleeve, a telescopic sleeve is inserted into the telescopic groove, a cover plate is connected to the top of the telescopic sleeve, a second hinge shaft is hinged around the bottom of the cover plate, an extension load-bearing plate is connected to the second hinge shaft, and a connecting slot is formed at the bottom of the outer end of the extension load-bearing plate; a connecting ring is fixedly connected to the outer top of the sleeve, a receiving groove is formed at the top of the connecting ring, the receiving groove receives a compression ring, and multiple sets of insertion posts are provided around the top of the compression ring.

[0007] Preferably, the bottom of the sleeve is provided with a cone head, the top of the sleeve is provided with a reinforcing ring, and the bottom of the reinforcing ring is provided with reinforcing anchors. The sleeve is fixed to the bottom of the foundation pit trestle plate by the cone head and the reinforcing anchors around the bottom of the reinforcing ring.

[0008] Preferably, the sleeve and the telescopic sleeve are both provided with grouting cavities in the middle, and the cover plate is provided with grouting holes in the middle, so that cement grout can be injected into the grouting cavities in the middle of the sleeve and the cone through the grouting holes in the middle of the cover plate.

[0009] Preferably, the outer periphery of the connecting ring provided on the outer side of the top of the sleeve is hinged with a first hinge shaft, and a diagonal brace is connected to the first hinge shaft. A cavity is opened in the middle of the diagonal brace, and a telescopic diagonal brace is inserted into the cavity. The diagonal brace and the telescopic diagonal brace can swing through the first hinge shaft.

[0010] Preferably, a through hole is provided on one side of the outer end of the diagonal brace, and multiple sets of through holes are provided on one side of the telescopic diagonal brace. Fixing bolts are inserted into the through holes that coincide with the diagonal brace and the telescopic diagonal brace to fix the telescopic diagonal brace in the diagonal brace.

[0011] Preferably, the compression ring can slide on the telescopic sleeve, and the compression ring can lift the extended load-bearing plate connected to the second hinge shaft, so that the extended load-bearing plate is supported on the bottom of the reserved hole of the foundation pit trestle plate.

[0012] Preferably, the bottom of the cover plate has multiple sets of slots around its perimeter. The slots are located between the second hinge shaft and the extended load-bearing plate, and the insertion post at the top of the compression ring can be inserted into the slot.

[0013] Preferably, the cover plate has a second telescopic groove on one side of the slot, and a spring is provided in the second telescopic groove. The inner side of the spring is connected to the inner wall of the second telescopic groove, and the outer side of the spring is connected to a limiting post. The outer side of the limiting post is set as an arc surface, and the spring can drive the limiting post to extend and retract.

[0014] Preferably, a fixing hole is provided on one side of the top of the insertion post, and the spring can drive the limiting post to extend and retract, so that the limiting post is inserted into the fixing hole.

[0015] A construction method for a pile foundation structure under a foundation pit trestle slab includes the following steps:

[0016] Step 1: Installation. First, pre-drill holes in the foundation pit trestle. After the foundation pit trestle is completed, insert the sleeve into the pre-drill holes and insert the cone at the bottom of the sleeve into the soil at the bottom of the foundation pit trestle. At the same time, reinforce the insertion of the cone by the reinforcing anchor at the bottom of the reinforcing ring set at the top of the sleeve. Meanwhile, the telescopic sleeve expands and contracts in the telescopic groove according to the construction height of the foundation pit trestle, so that the top surface of the cover plate is parallel to the top surface of the foundation pit trestle.

[0017] Step 2: Then, by pushing the compression ring in the storage groove upwards onto the telescopic sleeve, the extended load-bearing plate connected to the second hinge shaft at the bottom of the cover plate is lifted up, so that the extended load-bearing plate is held against the bottom of the reserved hole of the foundation pit trestle plate. At the same time, the insertion pins set around the top of the compression ring are inserted into the slots opened at the bottom of the cover plate. When the fixing hole is inserted into the slot, it compresses the arc surface of the limiting pin, so that the spring drives the limiting pin to extend and retract in the second telescopic groove, so that the limiting pin is inserted into the fixing hole, and the compression ring is fixed at the bottom of the cover plate. Then, according to the extension and retraction height of the telescopic sleeve, the telescopic brace is pulled to extend and retract in the cavity opened in the middle of the brace, so that the outer end of the telescopic brace can be inserted into the connecting slot at the bottom of the outer end of the extended load-bearing plate.

[0018] Step 3: Support. Insert the end of the telescopic brace into the connecting slot by swinging diagonal brace and telescopic diagonal brace. Then, insert fixing bolts into the through holes where the diagonal brace and telescopic diagonal brace overlap to fix the telescopic diagonal brace. This allows the diagonal brace and telescopic diagonal brace to support the connecting slot, increasing the bearing area of ​​the sleeve and cone. Finally, inject cement grout into the sleeve and telescopic sleeve through the grouting hole in the cover plate.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] This invention proposes a pile foundation structure and construction method for a foundation pit trestle slab. First, pre-drilled holes are made in the foundation pit trestle slab. After the foundation pit trestle slab is constructed, a sleeve is inserted into the pre-drilled holes, and the conical head at the bottom of the sleeve is inserted into the soil at the bottom of the foundation pit trestle slab. Simultaneously, the insertion of the conical head is reinforced by reinforcing anchors at the bottom of the reinforcing ring at the top of the sleeve. Meanwhile, the telescopic sleeve extends and retracts in the telescopic groove according to the construction height of the foundation pit trestle slab, making the top surface of the cover plate parallel to the top surface of the foundation pit trestle slab. Then, by pushing the compression ring in the receiving groove upwards on the telescopic sleeve, the extended load-bearing plate connected to the second hinge shaft at the bottom of the cover plate is lifted, so that the extended load-bearing plate supports the bottom perimeter of the pre-drilled holes in the foundation pit trestle slab. At the same time, the insertion posts set around the top perimeter of the compression ring are inserted into the slots opened at the bottom of the cover plate. When the fixing hole is inserted into the slot, it compresses the arc surface of the limiting post, causing the spring to drive the limiting post to extend and retract in the second telescopic groove, so that the limiting post is inserted into the fixing hole and the compression ring is fixed to the bottom of the cover plate. Then, according to the extension height of the telescopic sleeve, the telescopic brace is pulled to extend and retract in the cavity opened in the middle of the brace, so that the outer end of the telescopic brace can be inserted into the connecting slot at the bottom of the outer end of the extension load-bearing plate. The end of the telescopic brace is then inserted into the connecting slot by swinging the brace and the telescopic brace. Then, the fixing bolt is inserted into the through hole where the brace and the telescopic brace overlap to fix the extension and retraction of the telescopic brace. The brace and the telescopic brace support the connecting slot, increasing the bearing area of ​​the sleeve and the cone in the connecting slot. Finally, cement grout is injected into the sleeve and the telescopic sleeve through the grouting hole in the cover plate. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0022] Figure 2 This is a schematic diagram of the cross-sectional structure of the present invention;

[0023] Figure 3 This is a schematic diagram of the cross-sectional structure of the cover plate of the present invention;

[0024] Figure 4 for Figure 3 Enlarged schematic diagram of the structure at point A in the middle;

[0025] Figure 5 This is a schematic diagram of the three-dimensional structure of the collar of the present invention.

[0026] In the diagram: 1. Sleeve; 2. Cone; 3. Reinforcing ring; 4. Reinforcing anchor; 5. Expansion groove; 6. Expansion sleeve; 7. Grouting cavity; 8. Cover plate; 9. Grouting hole; 10. Connecting ring; 11. First hinge shaft; 12. Diagonal brace; 13. Expansion diagonal brace; 14. Through hole; 15. Fixing bolt; 16. Second hinge shaft; 17. Extension load-bearing plate; 18. Connecting slot; 19. Storage slot; 20. Extrusion ring; 21. Insertion post; 22. Fixing hole; 23. Slot; 24. Second expansion groove; 25. Spring; 26. Limiting post. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the present invention clear and complete, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of the present invention, and are merely illustrative of the embodiments of the present invention. They are not intended to limit 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.

[0028] Please see Figures 1 to 5 The present invention provides a technical solution: a sleeve 1, with a telescopic groove 5 formed around the inner wall of the sleeve 1, a telescopic sleeve 6 inserted into the telescopic groove 5, a cover plate 8 connected to the top of the telescopic sleeve 6, a second hinge shaft 16 hinged around the bottom of the cover plate 8, an extension load-bearing plate 17 connected to the second hinge shaft 16, and a connecting slot 18 formed at the bottom of the outer end of the extension load-bearing plate 17; a connecting ring 10 fixedly connected to the outer top of the sleeve 1, a receiving groove 19 formed at the top of the connecting ring 10, a compression ring 20 receiving the compression ring 20, and multiple sets of insertion posts 21 arranged around the top of the compression ring 20; pushing the compression ring 20 in the receiving groove 19 to rise on the telescopic sleeve 6, lifting the extension load-bearing plate 17 connected to the second hinge shaft 16 hinged at the bottom of the cover plate 8.

[0029] The bottom of the sleeve 1 is provided with a cone head 2, and the top of the cone head 2 is provided with a reinforcing ring 3. The bottom of the reinforcing ring 3 is provided with reinforcing anchors 4. The sleeve 1 is fixed to the bottom of the foundation pit trestle by the cone head 2 and the reinforcing anchors 4 around the bottom of the reinforcing ring 3. The cone head 2 at the bottom of the sleeve 1 is inserted into the soil at the bottom of the foundation pit trestle, and the insertion of the cone head 2 is reinforced by the reinforcing anchors 4 at the bottom of the reinforcing ring 3 at the top of the sleeve 1.

[0030] Both the sleeve 1 and the telescopic sleeve 6 have grouting cavities 7 in their middle sections, and the cover plate 8 has grouting holes 9 in its middle section. Cement grout can be injected into the grouting cavities 7 in the middle sections of the sleeve 1 and the cone head 2 through the grouting holes 9 in the middle section of the cover plate 8. A first hinge shaft 11 is hinged around the outer periphery of the connecting ring 10 on the top outer side of the sleeve 1. A diagonal brace 12 is connected to the first hinge shaft 11. A cavity is opened in the middle of the diagonal brace 12, and a telescopic diagonal brace 13 is inserted into the cavity. The diagonal brace 12 and the telescopic diagonal brace 13 can be connected by the first hinge. Shaft 11 swings; a through hole 14 is provided on one side of the outer end of the diagonal brace 12, and multiple sets of through holes 14 are provided on one side of the telescopic diagonal brace 13. Fixing bolts 15 are inserted into the through holes 14 that overlap between the diagonal brace 12 and the telescopic diagonal brace 13 to fix the telescopic diagonal brace 13 in the diagonal brace 12; fixing bolts 15 are inserted into the through holes 14 that overlap between the diagonal brace 12 and the telescopic diagonal brace 13 to fix the telescopic diagonal brace 13, so that the diagonal brace 12 and the telescopic diagonal brace 13 support the connecting slot 18.

[0031] The swinging diagonal brace 12 and the telescopic diagonal brace 13 are connected by inserting the end of the telescopic diagonal brace 13 into the connecting slot 18. Then, the fixing bolt 15 is inserted into the through hole 14 where the diagonal brace 12 and the telescopic diagonal brace 13 overlap to fix the telescopic diagonal brace 13.

[0032] The compression ring 20 can slide on the telescopic sleeve 6. The compression ring 20 can lift the extended load-bearing plate 17 connected to the second hinge shaft 16, so that the extended load-bearing plate 17 is held against the bottom of the reserved hole of the foundation pit trestle plate. Multiple sets of slots 23 are opened around the bottom of the cover plate 8. The slots 23 are opened between the second hinge shaft 16 and the extended load-bearing plate 17. The insertion post 21 provided on the top of the compression ring 20 can be inserted into the slot 23. When the fixing hole 22 is inserted into the slot 23, it compresses the arc surface of the limiting post 26.

[0033] The cover plate 8 has a second telescopic groove 24 on one side of the slot 23. A spring 25 is installed in the second telescopic groove 24. The inner side of the spring 25 is connected to the inner wall of the second telescopic groove 24, and the outer side of the spring 25 is connected to a limiting post 26. The outer side of the limiting post 26 is set as an arc surface. The spring 25 can drive the limiting post 26 to extend and retract. A fixing hole 22 is opened on one side of the top of the insertion post 21. The spring 25 can drive the limiting post 26 to extend and retract, so that the limiting post 26 is inserted into the fixing hole 22. When the fixing hole 22 is inserted into the slot 23, it squeezes the arc surface of the limiting post 26, so that the spring 25 drives the limiting post 26 to extend and retract in the second telescopic groove 24, so that the limiting post 26 is inserted into the fixing hole 22, and the compression ring 20 is fixed to the bottom of the cover plate 8.

[0034] In actual use, pre-drilled holes are first made on the foundation pit trestle. After the foundation pit trestle is constructed, the sleeve 1 is inserted into the pre-drilled holes, and the cone 2 at the bottom of the sleeve 1 is inserted into the soil at the bottom of the foundation pit trestle. At the same time, the insertion of the cone 2 is reinforced by the reinforcing anchor 4 at the bottom of the reinforcing ring 3 set at the top of the sleeve 1. Meanwhile, the telescopic sleeve 6 expands and contracts in the expansion groove 5 according to the construction height of the foundation pit trestle, so that the top surface of the cover plate 8 is flush with the foundation pit trestle. The top surface of the plate is parallel. Then, by pushing the compression ring 20 in the storage groove 19 upwards, it rises on the telescopic sleeve 6, lifting the extended load-bearing plate 17 connected to the second hinge shaft 16 hinged to the bottom of the cover plate 8. The extended load-bearing plate 17 is held against the bottom of the reserved hole of the foundation pit trestle plate. At the same time, the insertion post 21 set around the top of the compression ring 20 is inserted into the slot 23 opened at the bottom of the cover plate 8. When the fixing hole 22 is inserted into the slot 23, it compresses the arc surface of the limiting post 26, causing the spring 25 to drive the limiting post 26 to extend and retract in the second telescopic groove 24, so that the limiting post 26 is inserted into the fixing hole 22, fixing the compression ring 20 to the bottom of the cover plate 8. Then, according to the extension height of the telescopic sleeve 6, the telescopic bracing plate 13 is pulled to extend and retract in the cavity opened in the middle of the bracing plate 12, so that the outer end of the telescopic bracing plate 13 can be inserted into the connecting slot 18 at the bottom of the outer end of the extended load-bearing plate 17. And by swinging the bracing plate 12 The end of the telescopic brace 13 is inserted into the connecting slot 18. Then, the fixing bolt 15 is inserted into the through hole 14 that overlaps with the brace 12 and the telescopic brace 13 to fix the telescopic brace 13. This allows the brace 12 and the telescopic brace 13 to support the connecting slot 18, increasing the bearing area of ​​the sleeve 1 and the cone 2. Finally, cement grout is injected into the sleeve 1 and the telescopic sleeve 6 through the grouting hole 9 in the cover plate 8.

[0035] Although the illustrative specific embodiments of this application have been described above to enable those skilled in the art to understand this application, this application is not limited to the scope of the specific embodiments. For those skilled in the art, all applications utilizing the concept of this application are protected as long as various variations are within the spirit and scope of this application as defined and determined by the appended claims.

Claims

1. A foundation pile construction under a pile foundation of a foundation trestle, characterized in that: include: A sleeve (1) has a telescopic groove (5) around its inner wall. A telescopic sleeve (6) is inserted into the telescopic groove (5). A cover plate (8) is connected to the top of the telescopic sleeve (6). A second hinge shaft (16) is hinged around the bottom of the cover plate (8). An extension load-bearing plate (17) is connected to the second hinge shaft (16). A connecting slot (18) is opened at the bottom of the outer end of the extension load-bearing plate (17). A connecting ring (10) is fixedly connected to the top outer side of the sleeve (1). A storage groove (19) is provided on the top of the connecting ring (10). The storage groove (19) stores the extrusion ring (20). Multiple sets of plug-in posts (21) are provided around the top of the extrusion ring (20). The sleeve (1) and the telescopic sleeve (6) are provided with grouting cavities (7) in the middle, and the cover plate (8) is provided with grouting holes (9) in the middle. Cement slurry can be injected into the grouting cavities (7) in the middle of the sleeve (1) and the cone (2) through the grouting holes (9) in the middle of the cover plate (8). The outer periphery of the connecting ring (10) provided on the top outer side of the sleeve (1) is hinged with a first hinge shaft (11). A diagonal brace (12) is connected to the first hinge shaft (11). A cavity is provided in the middle of the diagonal brace (12). A telescopic diagonal brace (13) is inserted into the cavity. The diagonal brace (12) and the telescopic diagonal brace (13) can swing through the first hinge shaft (11). The compression ring (20) can slide on the telescopic sleeve (6), and the compression ring (20) can lift the extension load plate (17) connected on the second hinge shaft (16), so that the extension load plate (17) is held against the bottom of the reserved hole of the foundation pit trestle plate. The bottom of the cover plate (8) has multiple sets of slots (23) around its perimeter. The slots (23) are located between the second hinge shaft (16) and the extended load-bearing plate (17). The insertion post (21) provided on the top of the compression ring (20) can be inserted into the slot (23). The end of the telescopic brace (13) is inserted into the connecting slot (18) by means of the swing brace (12) and the telescopic brace (13).

2. The pile foundation structure under the foundation pit trestle slab according to claim 1, characterized in that: The bottom of the sleeve (1) is provided with a cone (2), and a reinforcing ring (3) is provided on the top of the cone (2). Reinforcing anchors (4) are provided around the bottom of the reinforcing ring (3). The sleeve (1) is fixed to the bottom of the foundation pit trestle plate by the cone (2) and the reinforcing anchors (4) around the bottom of the reinforcing ring (3).

3. The pile foundation structure under the foundation pit trestle slab according to claim 2, characterized in that: A through hole (14) is provided on one side of the outer end of the diagonal brace (12), and multiple sets of through holes (14) are provided on one side of the telescopic diagonal brace (13). Fixing bolts (15) are inserted into the through holes (14) that overlap the diagonal brace (12) and the telescopic diagonal brace (13) to fix the telescopic diagonal brace (13) in the diagonal brace (12).

4. The pile foundation structure under the foundation pit trestle slab according to claim 3, characterized in that: The cover plate (8) has a second telescopic groove (24) on one side of the slot (23). A spring (25) is provided in the second telescopic groove (24). The inner side of the spring (25) is connected to the inner wall of the second telescopic groove (24). The outer side of the spring (25) is connected to the limiting post (26). The outer side of the limiting post (26) is set as an arc surface. The spring (25) can drive the limiting post (26) to extend and retract.

5. The pile foundation structure under the foundation pit trestle slab according to claim 4, characterized in that: The top side of the plug (21) is provided with a fixing hole (22). The spring (25) can drive the limiting post (26) to extend and retract, so that the limiting post (26) can be inserted into the fixing hole (22).

6. A construction method for a pile foundation structure under a foundation pit trestle as described in claim 5, characterized in that: Includes the following steps: Step 1: Installation. First, a reserved hole is opened on the foundation pit trestle plate. After the foundation pit trestle plate is completed, the sleeve (1) is inserted into the reserved hole and the cone (2) at the bottom of the sleeve (1) is inserted into the soil at the bottom of the foundation pit trestle plate. At the same time, the insertion of the cone (2) is reinforced by the reinforcing anchor (4) at the bottom of the reinforcing ring (3) set on the top of the cone (2) of the sleeve (1). Meanwhile, the telescopic sleeve (6) expands and contracts in the telescopic groove (5) according to the height of the foundation pit trestle plate construction, so that the top surface of the cover plate (8) is parallel to the top surface of the foundation pit trestle plate. Step 2: Then, by pushing the compression ring (20) in the storage groove (19) upwards onto the telescopic sleeve (6), the extended load-bearing plate (17) connected to the second hinge shaft (16) hinged at the bottom of the cover plate (8) is lifted up, so that the extended load-bearing plate (17) is held against the bottom of the reserved hole of the foundation pit trestle plate. At the same time, the insertion pins (21) set around the top of the compression ring (20) are inserted into the slots (23) opened at the bottom of the cover plate (8). When the fixing hole (22) is inserted into the slot (23), the limiting pin (21) is fixed. 6) The arc surface is squeezed, so that the spring (25) drives the limiting post (26) to extend and retract in the second telescopic groove (24), so that the limiting post (26) is inserted into the fixing hole (22), and the squeezing ring (20) is fixed at the bottom of the cover plate (8). Then, according to the extension height of the telescopic sleeve (6), the telescopic bracing plate (13) is pulled to extend and retract in the cavity opened in the middle of the bracing plate (12), so that the outer end of the telescopic bracing plate (13) can be inserted into the connecting slot (18) at the bottom of the outer end of the extension load-bearing plate (17); Step 3: Support. By swinging the diagonal brace (12) and telescopic diagonal brace (13), the end of the telescopic diagonal brace (13) is inserted into the connecting slot (18). Then, the fixing bolt (15) is inserted into the through hole (14) where the diagonal brace (12) and the telescopic diagonal brace (13) overlap, and the telescopic diagonal brace (13) is fixed to extend and retract. The diagonal brace (12) and the telescopic diagonal brace (13) support the connecting slot (18), and the connecting slot (18) increases the bearing area of ​​the sleeve (1) and the cone (2). Finally, cement grout is injected into the sleeve (1) and the telescopic sleeve (6) through the grouting hole (9) in the cover plate (8).

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