jack support at the top end of the steel composite batter pile

Abstract

The utility model discloses a steel structure composite type inclined strut pile top end's jack support, it includes lower sleeve, baffle and install the upper casing of jack, lower sleeve, baffle, upper casing weld in proper order, the piston of jack is fixed with the top plate for resisting the crown beam inclined surface, and the steel structure inclined strut sleeve of lower sleeve and composite type inclined strut pile top end is combined, and the top of steel structure inclined strut's branch angle steel is welded with steel resisting plate, and steel resisting plate is equipped with center hole, and the top of steel structure inclined strut is equipped with internal thread hole to lower sleeve side board and is equipped with outer through -hole, and the internal thread hole and outer through -hole are one -to -one correspondence, and steel resisting plate and baffle abut, and lower sleeve and steel structure inclined strut top are connected through the bolt of passing through corresponding outer through -hole and rotating into corresponding internal thread hole. This jack support and steel structure inclined strut between do not need welding also can ensure that the connection is firm.

Description

Technical Field

[0001] This utility model relates to the field of building foundation pit construction technology, specifically to a jack support at the top of a steel composite inclined support pile when a deep foundation pit is supported by a steel composite inclined support pile. Background Technology

[0002] With the rapid development of underground space construction, the combined foundation pit support method of retaining piles, capping beams and steel structure composite inclined piles is being used more and more widely.

[0003] The steel-structured composite inclined bracing pile is constructed using existing technology such as an inclined concentric composite pile driver, like the one with patent application number 202220441018.5. Figure 1 , Figure 2 As shown, the pile driver can inclinedly install steel structure bracing 101 and concentric drill rod 102, and make the drill rod penetrate the steel structure bracing from top to bottom, drive the drill rod to drill at an incline and simultaneously statically press the steel structure bracing into the soil at an incline; after the drill rod reaches the bottom elevation of the foundation pit, the cement grout is sprayed to cover the synchronously implanted steel structure bracing, forming a composite pile segment 104 with cement soil on the outside and steel structure bracing core inside below the foundation slab 103; while no cement grout is sprayed above the foundation slab, thus forming a pure steel structure bracing segment 105; the above-mentioned upper pure steel structure bracing segment and lower composite pile segment of the inclined stiff composite pile is a steel structure composite bracing pile.

[0004] The overall construction process of the above-mentioned combined support method is as follows: first, construct the foundation pit retaining piles 106 along the edge of the foundation pit; then construct the steel composite inclined bracing piles; then construct the capping beam 107 at the top of the foundation pit retaining piles; and install the preloaded jacks 108 at the top of the steel composite inclined bracing piles. After the concrete strength of the capping beam reaches the design requirements, tension the jacks to tighten the capping beam, and then the foundation pit can be excavated.

[0005] This application relates to a tool-type jack support located at the top of a steel composite inclined brace pile, used to connect the steel composite inclined brace pile, the preloaded jack, and the capping beam. Existing jack supports are integral structures, comprising a jack sleeve and a lower sleeve welded together. The jack piston extends from the upper opening of the jack sleeve, and a top plate is fixed to the piston to press against the inclined surface of the capping beam. The lower sleeve engages with the steel inclined brace at the top of the composite inclined brace pile, and the lower sleeve is welded to the branch angle steel and connecting plate at the top of the steel inclined brace.

[0006] The jack support at the top of the aforementioned steel composite inclined bracing pile has the following defects.

[0007] This type of support has poor versatility, only suitable for steel composite bracing piles with a single cross-sectional size. If the cross-sectional size of the steel bracing is too small, the angle steel and connecting plates of the bracing will be difficult to fit snugly against the side plate of the support's lower sleeve, making welding and fixing difficult. Therefore, on the construction site, different cross-sectional sizes of supports must be specifically equipped for each specification of steel bracing, resulting in poor economic efficiency and making it unsuitable for steel bracing piles with different cross-sectional sizes. Similarly, the jack sleeve and the lower sleeve are directly and permanently welded together, thus limiting the support to one specification of jack. If the jack specification on site is incompatible, further issues may arise. Replacing jacks with different specifications requires fabricating new supports. Furthermore, to ensure a secure connection between the supports and the top of the steel structure brace and to meet the requirements for transmitting preload, the angle steel and gusset plates at the top of the steel structure brace must be welded to the lower sleeve side plate. This results in time-consuming and labor-intensive disassembly and assembly processes. Welding is required during assembly, and the steel structure brace needs to be cut along the lower sleeve during disassembly. The remaining parts of the angle steel and gusset plates also need to be removed from the lower sleeve. The operation is complex, cumbersome, and difficult. Cutting and damaging the angle steel and gusset plates at the top of the steel structure brace also affects the turnover rate of the steel structure brace and supports. Utility Model Content

[0008] The technical problem to be solved by this utility model is to provide a jack support for the top of a composite steel brace pile that can ensure a firm connection with the steel structure without welding.

[0009] The technical solution of this utility model is to provide a jack support for the top of a steel composite inclined brace pile, which includes a lower sleeve, a partition plate, and an upper shell on which the jack is installed. The lower sleeve, partition plate, and upper shell are welded in sequence. A top plate for pressing against the inclined surface of the cap beam is fixed on the piston of the jack. The lower sleeve fits into the steel inclined brace at the top of the composite inclined brace pile. A steel abutment plate is welded to the top of the angle steel of the steel inclined brace. The steel abutment plate has a central hole. The gusset plate at the top of the steel inclined brace has an internal threaded hole. The side plate of the lower sleeve has an external through hole. The internal threaded hole and the external through hole correspond one-to-one. The steel abutment plate abuts against the partition plate. The lower sleeve and the top of the steel inclined brace are connected by bolts that pass through the corresponding external through holes and are screwed into the corresponding internal threaded holes.

[0010] Compared with existing technologies, the jack support with the above structure has the following advantages.

[0011] Because a steel abutment plate is added to the top of the steel structure brace of the steel composite braced pile, and the steel abutment plate abuts against the support plate, it effectively bears most of the load and meets the requirements for transmitting preload. In this way, the lower sleeve of the support does not need to be welded to the steel structure brace lacing plate and the branch angle steel. Instead, the bolted connection is sufficient to meet the needs of connection between the support and the steel structure brace and the transmission of preload. Compared with the welding and cutting of the existing technology, the bolted connection significantly reduces the difficulty of installation and disassembly, saves more time and effort, and does not require cutting the steel structure brace during disassembly, achieving non-destructive disassembly. There is no damage to the support body and the branch angle steel and lacing plate at the top of the steel structure brace, which is conducive to the reuse of the support and the steel structure brace and improves economic efficiency.

[0012] As a preferred embodiment, a steel pad is provided between the lower sleeve side plate and the lacing plate at the top of the steel structure diagonal brace to compensate for the gap. The steel pad has a central through hole, and each central through hole corresponds to a bolt, an external through hole, and an internal threaded hole. The bolt passes through the corresponding external through hole and central through hole and is screwed into the corresponding internal threaded hole. By adding a steel pad between the lower sleeve side plate and the lacing plate at the top of the steel structure diagonal brace, the problems of mismatched steel structure diagonal brace dimensions, and the inability to connect and fix the branch angle steel and lacing plate of the steel structure diagonal brace to the lower sleeve side plate of the support are solved. This allows the support to be adapted to steel structure diagonal braces with different cross-sectional dimensions and specifications, significantly enhancing the versatility of the support and further improving economic benefits.

[0013] As a further optimization, the upper shell is a cylindrical shell welded to the partition plate, with the opening of the cylindrical shell facing upwards. The jack sleeve is fitted inside the cylindrical shell with a gap, and steel wedges are inserted between the cylindrical shell and the jack sleeve to compensate for the gap. In this way, while ensuring the load transfer, a detachable connection between the jack and the support is achieved. After the workers fit and fix the support to the steel structure diagonal brace, they can replace and select the appropriate jack according to the actual site conditions. It also enhances the versatility and adaptability of the support, facilitates the reuse of the jack and the support, and further improves economic efficiency.

[0014] As a further optimization, multiple triangular stiffening ribs are welded between the outer ring surface of the shell and the upper surface of the partition plate; this enhances the strength and stability of the shell and the partition plate.

[0015] As a further preferred option, the bolt includes a threaded rod and a double nut screwed onto the outer end of the threaded rod. The use of double nuts can further enhance the connection effect of the bolt and ensure the firmness and stability of the steel structure brace and the sleeve below the support.

[0016] As an alternative, the top plate is welded with an upper lifting ring, and the partition plate is welded with a lower lifting ring; this makes it easy to lift and fit the support onto the upper end of the steel structure diagonal brace during assembly, and easy to remove the support with the bolts removed from the upper end of the steel structure diagonal brace during disassembly. Attached Figure Description

[0017] Figure 1This is a structural schematic diagram of an existing inclined concentric composite pile driver.

[0018] Figure 2 This is a structural diagram of a combined foundation pit support system using steel-framed composite inclined bracing piles.

[0019] Figure 3 This is a schematic diagram of the structure of the jack support at the top of the steel composite inclined brace pile of this utility model when it is connected to the crown beam.

[0020] Figure 4 This is a structural schematic diagram of the jack support at the top of the steel composite inclined brace pile of this utility model.

[0021] Figure 5 yes Figure 4 A schematic diagram of the decomposed state structure.

[0022] The figure shows

[0023] The existing technology includes the following components: 101, steel structure diagonal brace; 102, drill rod; 103, foundation slab; 104, composite pile segment; 105, pure steel structure diagonal brace segment; 106, foundation pit retaining pile; 107, capping beam; 108, jack.

[0024] The components of this utility model are: 1. lower sleeve, 2. partition plate, 3. cylinder shell, 4. piston, 5. crown beam bracket, 6. top plate, 7. self-locking ring, 8. steel structure diagonal brace, 8.1. branch angle steel, 8.2. lacing plate, 9. steel abutment plate, 9.1. center hole, 10. internal threaded hole, 11. external through hole, 12. steel pad, 13. screw rod, 14. jack sleeve, 15. steel wedge, 16. triangular stiffening rib, 17. nut, 18. upper lifting ring, 19. lower lifting ring, 20. central through hole. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0026] like Figures 3-5 As shown, Embodiment 1 of the jack support at the top of the steel composite inclined brace pile of this utility model includes a steel lower sleeve 1, a steel partition 2, and a steel upper shell on which the jack is installed. The lower sleeve 1, partition 2, and upper shell are welded in sequence.

[0027] A top plate 6 is fixed to the piston 4 of the jack to abut against the inclined surface of the crown beam bracket 5. The piston 4 is also screwed with a self-locking ring 7 to prevent the top plate 6 from retracting. The upper part of the steel composite inclined brace pile is a pure steel inclined brace section. Therefore, the top of the steel composite inclined brace pile is the top of the steel inclined brace 8. The lower sleeve 1 of the jack support of this application fits into the top of the steel inclined brace 8 of the composite inclined brace pile. A steel abutment plate 9 is welded to the top of the branch angle steel 8.1 of the steel inclined brace 8. Since the upper end of the drill rod of the pile driver needs to pass through the top of the steel inclined brace 8 to connect with the power head of the pile driver, a central hole 9.1 for the drill rod to pass through is provided in the steel abutment plate 9. The top plate 8.2 of the steel structure diagonal brace 8 is provided with an internal threaded hole 10, and the side plate of the lower sleeve 1 is provided with an external through hole 11. The internal threaded holes 10 and external through holes 11 correspond one-to-one. To ensure a firm connection, each plate 8.2 at the top of the steel structure diagonal brace 8 is generally provided with two internal threaded holes 10, and each side plate of the lower sleeve 1 is also provided with two external through holes 11. The steel abutment plate 9 abuts against the partition plate 2, and the lower sleeve 1 and the top of the steel structure diagonal brace 8 are connected by bolts that pass through the corresponding external through holes 11 and are screwed into the corresponding internal threaded holes 10. In this embodiment, the cross-sectional shapes of the lower sleeve 1 and the steel structure diagonal brace 8 match perfectly, so there is no gap between the side plate of the lower sleeve 1 and the plate 8.2 at the top of the steel structure diagonal brace 8, and therefore there is no need to use a steel pad 12.

[0028] The upper shell is a cylindrical shell 3 welded to the partition plate 2. The opening of the cylindrical shell 3 faces upward. The jack sleeve 14 is fitted inside the cylindrical shell 3 with a gap. The cylindrical shell 3 is relatively short and only fits the lower part of the jack sleeve 14. Multiple steel wedges 15 are inserted between the cylindrical shell 3 and the jack sleeve 14 to compensate for the gap between them. Multiple reinforcing ribs 16, such as eight triangular ribs, are welded between the outer circumference of the cylindrical shell 3 and the upper surface of the partition plate 2.

[0029] The bolt in this embodiment is preferably a double-nut type, that is, the bolt includes a screw 13 and a double nut 17 screwed on the outer end of the screw 13.

[0030] The top plate 6 is welded with an upper lifting ring 18, and the partition plate 2 is welded with a lower lifting ring 19.

[0031] Embodiment 2 of the jack support at the top of the steel composite inclined brace pile of this utility model differs from Embodiment 1 in that the cross-sectional dimensions of the steel inclined brace 8 connected by the support are smaller. Therefore, there is a gap between the lower sleeve 1 side plate and the lacing plate 8.2 at the top of the steel inclined brace 8. A steel pad 12 is provided between the lower sleeve 1 side plate and the lacing plate 8.2 at the top of the steel inclined brace 8 to compensate for the gap. Each steel pad 12 also has two through holes 20. Each through hole 20 corresponds to a bolt, an outer through hole 11, and an internal threaded hole 10. The bolt passes through the corresponding outer through hole 11 and through hole 20 and screws into the corresponding internal threaded hole 10. The through holes 20 of the steel pad 12 are unthreaded and have a diameter slightly larger than the internal threaded hole 10 to allow the screw 13 to pass through.

Claims

1. A jack support for the top of a steel composite inclined brace pile, comprising a lower sleeve, a partition plate, and an upper shell on which a jack is mounted, wherein the lower sleeve, partition plate, and upper shell are welded sequentially; a top plate for pressing against the inclined surface of the capping beam is fixed on the jack piston, and the lower sleeve engages with the steel inclined brace at the top of the steel composite inclined brace pile; characterized in that: The top of the angle steel of the steel structure diagonal brace is welded with a steel abutment plate, and the steel abutment plate is provided with a central hole; the lacing plate at the top of the steel structure diagonal brace is provided with an internal threaded hole, and the lower sleeve side plate is provided with an external through hole. The internal threaded hole and the external through hole correspond one to one; the steel abutment plate abuts against the partition plate, and the lower sleeve and the top of the steel structure diagonal brace are connected by bolts that pass through the corresponding external through holes and are screwed into the corresponding internal threaded holes.

2. The jack support at the top of the steel composite inclined brace pile according to claim 1, characterized in that: A steel pad is provided between the lower side plate and the gusset plate at the top of the steel structure diagonal brace to compensate for the gap. The steel pad has a central through hole. Each central through hole corresponds to a bolt, an external through hole and an internal threaded hole. The bolt passes through the corresponding external through hole and central through hole and is screwed into the corresponding internal threaded hole.

3. The jack support at the top of the steel composite inclined brace pile according to claim 1, characterized in that: The upper shell is a cylindrical shell welded to the partition plate. The opening of the cylindrical shell faces upward. The jack sleeve is fitted inside the cylindrical shell with a gap, and a steel wedge is inserted between the cylindrical shell and the jack sleeve to compensate for the gap.

4. The jack support at the top of the steel composite inclined brace pile according to claim 3, characterized in that: Multiple triangular stiffening ribs are welded between the outer ring surface of the cylinder and the upper surface of the partition plate.

5. The jack support at the top of the steel composite inclined brace pile according to claim 1, characterized in that: A bolt consists of a threaded rod and a double nut screwed onto the outer end of the threaded rod.

6. The jack support at the top of the steel composite inclined brace pile according to claim 1, characterized in that: The top plate is welded with an upper lifting ring, and the partition plate is welded with a lower lifting ring.

Images