Deep foundation pit supporting mechanism and assembling and disassembling method thereof

Abstract

The invention relates to the technical field of foundation pit supporting, and discloses a deep foundation pit supporting mechanism which comprises a drilling assembly and a hydraulic impact hammer which are coaxially arranged and further comprises an anchor rod and a supporting truss assembly, the drilling assembly comprises a drilling cylinder, the drilling cylinder is cylindrical, a drilling rod is arranged in the drilling cylinder in a sleeved mode, and the hydraulic impact hammer and the drilling rod are coaxially arranged; the supporting truss assembly comprises a surrounding purlin, an anchor bed is arranged at the end, away from the top end of the surrounding purlin, of the surrounding purlin, a supporting side support is arranged at the top end of the anchor bed, a stay cable assembly is arranged between the two sides of the anchor bed, and the supporting truss assembly further comprises a web member arranged between the surrounding purlin and the stay cable assembly. The anchor rod comprises a guide cone, an auxiliary steel cable is arranged at the top end of the guide cone, a cross brace is arranged at the end, away from the guide cone, of the auxiliary steel cable, and a fastening bolt is arranged at the top end of the cross brace. Therefore, the side supporting plate of the supporting truss assembly can provide supporting for the vertical wall of the foundation pit and can also serve as a force application supporting plate of the anchor rod on the vertical wall of the foundation pit.

Description

Technical Field

[0001] The invention relates to the technical field of foundation pit supporting equipment, in particular to a deep foundation pit supporting mechanism and an assembly and disassembly method thereof. Background Art

[0002] During the excavation process of deep foundation pit, it is necessary to continuously support and reinforce the side walls or slopes to ensure the stability of the foundation pit structure. The soil nail wall is a retaining structure used in foundation pits. This structure requires anchor rods, mainly hollow grouting anchor rods. Its construction method is to drill holes in the foundation pit structure and grout through the hollow parts of the anchor rods to achieve the purpose of stabilizing the foundation pit structure. This method is simple to construct, has strong adaptability to the shape of the foundation pit, and requires a small construction site. It is widely used in deep foundation pit excavation projects. The existing drilling equipment needs to rotate forward to drill holes during work, and then take out and reverse to take soil. The operation time is long, and then the anchor rods are prone to displacement during the grouting process, and cannot fix the soil on the side walls of the deep pit well. Finally, the anchor rods alone cannot provide good support for the side walls of the deep pit, and there is still a risk of collapse of the side walls of the foundation pit. Summary of the Invention

[0003] The object of the present invention is to provide a deep foundation pit support mechanism which solves the problems raised in the above-mentioned background technology by fixing the anchor rod on the anchor seat and then adjusting the fixing position of the anchor seat so that the side support plate of the supporting truss assembly can not only provide support for the foundation pit wall but also serve as a force support plate for the anchor rod on the foundation pit wall.

[0004] To achieve the above purpose, a deep foundation pit support mechanism is provided, including a coaxially arranged drilling assembly and a hydraulic impact hammer, and also including an anchor rod and a support truss assembly, the drilling assembly including a drill barrel, the drill barrel is cylindrical, a drill rod is sleeved in the drill barrel, and the hydraulic impact hammer and the drill rod are coaxially arranged; the support truss assembly includes a purlin, an anchor seat is provided at the end away from the top of the purlin, a supporting side brace is provided at the top of the anchor seat, a cable assembly is provided between the two sides of the anchor seat, and also includes a web rod, which is provided between the purlin and the cable assembly; the anchor rod includes a guide cone, a secondary steel cable is provided at the top of the guide cone, a cross brace is provided at the end of the secondary steel cable away from the guide cone, and a fastening bolt is provided at the top of the cross brace.

[0005] Furthermore, a fixing groove cooperating with the web member is provided at the top of the perimeter purlin, the web member includes a jack cooperating with the fixing groove, and also includes a telescopic rod, the telescopic rod is fixedly connected to the perimeter purlin by a bolt, a web member fork ear is provided at the top of the telescopic rod, the web member fork ear includes a fork ear plate integrally connected with the telescopic rod, a group of parallelly arranged plywood is provided at the top of the fork ear plate, a fork ear is provided between the web member fork ears, the fork ear includes a group of parallelly arranged fork ear plywood, a channel plate is provided between the fork ear plywood, and the channel plate is provided with a hole running through it; The seat includes two anchor seat clamps arranged in parallel, an anchor seat shell is provided between the anchor seat clamps, the anchor seat shell includes upper and lower shell plates and front and rear shell plates arranged in parallel, and also includes a front inclined plate and a rear inclined plate. An anchor seat partition is provided inside the anchor seat shell, and a plurality of cable holes are opened on the anchor seat partition. The anchor seat shell is fixedly connected to the surrounding purlin through anchor seat bolts, and a weight block is provided in the anchor seat shell, and a groove for cooperating with the cable assembly is opened on the weight block, and a fastening hole for fixing the fastening bolts is opened on the rear shell plate.

[0006] Furthermore, the cable assembly includes a cable, which passes through the fork ear, and both ends of the cable are fixed in the anchor seat by bolts. It also includes a pull rod, and both ends of the pull rod are provided with pin holes. Multiple pull rods are connected end to end through the fork ear, and the pull rod is fixedly connected to the anchor seat through a pin; the support truss assembly also includes a corbel, and the corbel includes a corbel mounting seat, a corbel fixing block is provided at the bottom end of the corbel mounting seat, a pin seat is provided at the top end of the corbel mounting seat, and a side support hydraulic rod is also provided at the top end of the corbel mounting seat, and the side support hydraulic rod is provided on both sides of the pin seat; the supporting side support includes a side support plate, a pin splint is provided at the bottom end of the side support plate, the pin splint is connected to the pin seat through a pin, and the top of the side support hydraulic rod is hinged to the side support plate.

[0007] Furthermore, the anchor rod also includes a secondary anchor sleeve, one end of which is fixedly connected to the secondary steel cable, and also includes a main steel cable, which is arranged between the secondary anchor sleeve and the cross brace, and a plurality of fastening rings arranged at equal intervals are provided on the outside of the main steel cable, and a plurality of limiting teeth are provided on the outside of the fastening ring; the guide cone includes a cone shell and a cone top cover, the cone shell is a hollow structure and is cone-shaped, the cone shell and the cone top cover are integrally connected, the cone shell includes a cone section and a cylindrical section, a telescopic hole connecting the inside and the outside is provided on the outer side surface of the cylindrical section of the cone shell, and a secondary The steel cable hole also includes a conical baffle, the top-view cross-section of the conical baffle is fan-shaped, the interior of the conical baffle is hollow and the opening is facing the center line of the guide cone, the conical baffle slides with the telescopic hole, and also includes a secondary steel cable fixing plate, the secondary steel cable fixing plate is coaxially arranged with the conical shell, the secondary steel cable passes through the secondary steel cable hole and is fixedly connected to the secondary steel cable fixing plate, and also includes a cut-off rod screwed to the bottom end of the secondary steel cable fixing plate, the cut-off rod and the secondary steel cable fixing plate are coaxially arranged, and a plurality of retraction and extension components are hinged on the outer side of the cut-off rod, and the retraction and extension components are hinged to the conical baffle away from the end of the cut-off rod.

[0008] Furthermore, the guide cone also includes a retraction cylinder screwed to the bottom end of the cone shell. The retraction cylinder is hollow, and a cut-off rod hole is opened at the top of the retraction cylinder. A cut-off rod sealing sleeve that slides with the cut-off rod is provided on the inner side of the cut-off rod hole. A retraction spring is provided on the outside of the retraction cylinder, and one end of the retraction spring is fixedly connected to the cut-off rod.

[0009] Furthermore, the retraction and deployment assembly includes a retraction rod hinge seat, a plurality of U-shaped hinge seat grooves are opened on the outer side of the cut-off rod, the retraction rod hinge seat and the hinge seat groove slidingly cooperate, and also includes a hinge seat pneumatic rod, the hinge seat pneumatic rod is arranged at the bottom end in the hinge seat groove, the top of the hinge seat pneumatic rod is fixed to the retraction rod hinge seat, a lifting spring is provided on the outer side of the hinge seat pneumatic rod, and also includes a horizontal push rod, the horizontal push rod is hinged to the retraction rod hinge seat, and also includes a tilted push rod, one end of the tilted push rod is hinged to the horizontal push rod, and the tilted push rod is hinged to the cut-off rod away from the horizontal push rod end, and also includes a thrust spring, one end of the thrust spring is fixedly connected to the retraction rod hinge seat, and the thrust spring is fixedly connected to the middle of the tilted push rod away from the retraction rod hinge seat end, and a tilted push rod groove cooperating with the tilted push rod is opened at the bottom end of the horizontal push rod.

[0010] Furthermore, a pressure sleeve is provided at one end of the drill barrel, a cutting ring is provided at the end of the drill barrel away from the pressure sleeve, a mud outlet is opened on the outer side of the drill barrel close to the pressure sleeve end, a mud outlet pipe sleeve is provided on the outside of the drill barrel, a pressure sleeve retaining ring is provided on the outer side of the drill barrel, and the pressure sleeve retaining ring is integrally connected to the drill barrel; the pressure sleeve includes a pressure sleeve ring, the pressure sleeve ring is provided at the end of the pressure sleeve retaining ring away from the mud outlet pipe sleeve, a pressure plate is provided at the top of the pressure sleeve ring, the pressure plate is in a circular ring shape, the pressure plate and the pressure sleeve ring are integrally connected, and also includes a nut seat, the nut seat is rotatably matched with the drill barrel, and a screw hole is provided in the nut seat.

[0011] Furthermore, the hydraulic impact hammer includes an impact hammer body and an impact hammer shell. An impact sleeve is provided on the impact hammer shell near the pressure sleeve end. The outer diameter of the pressure sleeve ring is smaller than the inner diameter of the impact sleeve. A screw rod is provided on the impact hammer body near the pressure sleeve end. The screw rod is rotatably matched with the nut seat.

[0012] Furthermore, the drill rod includes a pressure-bearing main rod, a spiral cutting edge is provided on the outside of the pressure-bearing main rod, a cutting tube cavity is provided in the pressure-bearing main rod, the cutting tube cavity and the pressure-bearing main rod are arranged coaxially, a flange is connected to the outer side surface of the pressure-bearing main rod close to the pressure sleeve through a pin shaft, and also includes a coupling, both ends of the coupling are fixedly connected to the flange and the nut seat respectively through torque transmission bolts, a cone head is provided at the end of the pressure-bearing main rod away from the pressure sleeve, a cutting chamber is provided in the cone head, and also includes a cutting tube, an ultra-high-speed nozzle is provided in the cutting tube, the angle between the ultra-high-speed nozzle and the tangent of the outer side surface of the cone head is an acute angle, and also includes a rotating shaft sleeve, the rotating shaft sleeve is provided on the outer side surface of the pressure-bearing main rod, the rotating shaft sleeve and the cone head are fixedly connected through a pin shaft, and the pressure-bearing main rod rotates with the cone head through the rotating shaft sleeve.

[0013] A method for assembling and disassembling a deep foundation pit support mechanism comprises the following steps: S1: Drill holes in the side wall of the foundation pit by hammering the drill rod and drill barrel with a hydraulic impact hammer. When the hydraulic impact hammer strikes the pressure-bearing main rod, the screw rod and nut seat drive the pressure-bearing main rod to rotate, thereby moving the soil toward the mud outlet pipe sleeve. When the hydraulic impact hammer pulls back the screw rod, the pressure-bearing main rod is reversed, thereby bringing the soil out of the mud outlet pipe sleeve. S2: Place the anchor rod into the drill hole, then pull the main steel cable to pull the guide cone outward, then use the auxiliary steel cable to pull the retractable assembly to push the cone baffle outward, thereby fixing the guide cone in the drill hole, and then pour concrete into the drill hole to fix it; S3: Place the purlin of the supporting truss assembly at the bottom of the foundation pit, then fix the shape of the purlin through the cable assembly and the web, and fix the anchor rods at the supporting side braces and corbels.

[0014] The present invention has the following beneficial effects over the prior art: 1. The present invention uses a hydraulic impact hammer to hammer the drill rod and the drill barrel to drill holes in the side wall of the foundation pit. When the hydraulic impact hammer hammers the pressure-bearing main rod, the screw rod and the nut seat drive the pressure-bearing main rod to rotate, thereby moving the soil toward the mud outlet pipe sleeve. When the hydraulic impact hammer pulls back the screw rod, the pressure-bearing main rod is driven to reverse, thereby bringing the soil out of the mud outlet pipe sleeve.

[0015] 2. The purlin is used to prevent the support of the foundation pit wall at the bottom of the foundation pit. In order to reduce the deformation amplitude of the purlin, multiple webs are installed at the top of the purlin, and then a cable assembly is installed between the two supporting side supports. The deformation amplitude of the purlin can be controlled by the cable, the rod and the length of the telescopic rod. At the same time, the anchor seat can be fixed on the end face of the purlin and on the side of the side support plate of the supporting side support. That is, the side support plate of the supporting truss assembly can not only provide support for the foundation pit wall, but also serve as a force support plate for the anchor rod on the foundation pit wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of a drilling assembly according to the present invention; Figure 2 This is an axonometric view of the anchor rod of the present invention; Figure 3 This is an axonometric view of the support truss assembly of the present invention; Figure 4 It is a schematic diagram of the belly bar of the present invention; Figure 5 This is a schematic diagram of the cable assembly of the present invention; Figure 6 A schematic diagram of an anchor seat according to the present invention; Figure 7 This is an axonometric view of the supporting side brace of the present invention; Figure 8This is an axonometric view of another embodiment of the supporting side brace of the present invention; Figure 9 This is an axonometric view of the guide cone of the present invention; Figure 10 This is a top view of the guide cone of the present invention; Figure 11 For the present invention Figure 10 BB schematic diagram; Figure 12 It is an axonometric view of the retractable assembly of the present invention; Figure 13 A top view of the retractable assembly of the present invention; Figure 14 For the present invention Figure 13 CC schematic diagram; Figure 15 A top view of the drilling assembly of the present invention; Figure 16 For the present invention Figure 15 DD schematic diagram; Figure 17 For the present invention Figure 16 A local enlarged schematic diagram of point A; Figure 18 For the present invention Figure 16 A local enlarged schematic diagram of point C; Figure 19 A schematic diagram of a drill rod according to the present invention; Figure 20 For the present invention Figure 19 A partial enlarged schematic diagram of point B.

[0017] Figure: 1, drill barrel; 2, cutting ring; 3, mud pipe sleeve; 4, drill rod; 401, cone head; 402, cutting chamber; 403, cutting pipe; 404, rotating shaft sleeve; 405, pressure-bearing main rod; 406, spiral cutting edge; 407, cutting pipe cavity; 408, coupling; 409, flange; 410, ultra-high-speed nozzle; 5, hydraulic impact hammer; 501, impact sleeve; 502, screw ; 6, anchor rod; 601, guide cone; 602, auxiliary steel cable; 603, fastening ring; 604, auxiliary anchor sleeve; 605, cross brace; 606, fastening bolt; 607, cone shell; 608, cone baffle; 609, retraction assembly; 610, cut-off rod; 611, cone top cover; 612, auxiliary steel cable fixing plate; 613, retraction cylinder; 614, retraction spring; 615, cut-off rod seal Envelope; 616, tilt push rod; 617, horizontal push rod; 618, articulated seat gas pressure rod; 619, lifting spring; 620, thrust spring; 621, retractable rod articulated seat; 622, articulated seat groove; 7, cable assembly; 701, cable; 702, pull rod; 703, fork ear; 8, belly rod; 801, telescopic rod; 802, belly rod fork ear; 803, jack; 9, anchor seat; 901. Anchor seat shell; 902. Anchor seat partition; 903. Anchor seat bolt; 10. Purlin; 11. Support side brace; 1101. Side brace plate; 1102. Pin splint; 12. Corbel; 1201. Corbel mounting seat; 1202. Side brace hydraulic rod; 1203. Corbel fixing block; 13. Pressure sleeve; 1301. Nut seat; 1302. Pressure collar; 1303. Screw hole. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0019] In one embodiment, Figure 1-3 A deep foundation pit support mechanism shown in the figure includes a coaxially arranged drilling assembly and a hydraulic impact hammer 5, and also includes an anchor rod 6 and a support truss assembly. The drilling assembly includes a drill barrel 1, which is cylindrical and has a drill rod 4 sleeved inside the drill barrel 1. The hydraulic impact hammer 5 is coaxially arranged with the drill rod 4; the support truss assembly includes a purlin 10, an anchor seat 9 is provided at the end away from the top of the purlin 10, a supporting side brace 11 is provided at the top of the anchor seat 9, a cable assembly 7 is provided between the two sides of the anchor seat 9, and also includes a web rod 8, which is provided between the purlin 10 and the cable assembly 7; the anchor rod 6 includes a guide cone 601, a secondary steel cable 602 is provided at the top of the guide cone 601, a cross brace 605 is provided at the end of the secondary steel cable 602 away from the guide cone 601, and a fastening bolt 606 is provided at the top of the cross brace 605.

[0020] In this embodiment, according to the construction requirement of dry drilling for anchor drilling in the foundation pit, the drill rod 4 is hammered by the hydraulic impact hammer 5 of the drilling assembly, and a borehole is dug in the side wall of the foundation pit. After the hole is formed, the hole wall is cleaned by high-pressure air to ensure the adhesion between the mortar and the hole wall. Then the guide cone 601, the main steel cable and the auxiliary steel cable 602 are placed in the borehole, and cement mortar is poured in to combine with the soil layer to form an anchor rod 6 with strong tensile strength. One end of the anchor rod 6 is fixed on the outer wall of the foundation pit, and the other end is anchored in the soil layer, transmitting the side pressure of the vertical wall soil to the deep stable soil layer. In order to enhance the stability of the foundation pit vertical wall soil, a support truss assembly is installed inside the foundation pit. By fixing the anchor rod 6 on the anchor seat 9 or the support side support of the support truss assembly, the tension of the anchor rod 6 on the foundation pit vertical wall soil is increased while the supporting capacity of the support truss assembly on the foundation pit side wall is enhanced, thereby enhancing the stability of the foundation pit vertical wall soil.

[0021] In one embodiment, Figure 1 and 15 As shown in -20, a pressure sleeve 13 is provided at one end of the drill barrel 1, a cutting ring sleeve 2 is provided at the end of the drill barrel 1 away from the pressure sleeve 13, a mud outlet is opened on the outer side surface of the drill barrel 1 close to the pressure sleeve 13, a mud outlet is provided, a mud outlet sleeve 3 is provided on the outside of the drill barrel 1, a pressure sleeve retaining ring is provided on the outer side surface of the drill barrel 1, and the pressure sleeve retaining ring is integrally connected with the drill barrel 1; the pressure sleeve 13 includes a pressure sleeve ring 1302, the pressure sleeve ring 1302 is provided at the end of the pressure sleeve retaining ring away from the mud outlet sleeve 3, a pressure plate is provided at the top of the pressure sleeve ring 1302, the pressure plate is in a circular ring shape, and the pressure plate is integrally connected with the pressure sleeve ring 1302, and also includes a nut seat 1301, the nut seat 1301 is rotatably matched with the drill barrel 1, and a screw hole 1303 is provided in the nut seat 1301.

[0022] The hydraulic impact hammer 5 includes an impact hammer body and an impact hammer shell. An impact sleeve 501 is provided at the end of the impact hammer shell near the pressure sleeve 13. The outer diameter of the pressure sleeve ring 1302 is smaller than the inner diameter of the impact sleeve 501. A screw rod 502 is provided at the end of the impact hammer body near the pressure sleeve 13. The screw rod 502 is rotatably engaged with the nut seat 1301.

[0023] The drill rod 4 includes a pressure-bearing main rod 405, a spiral cutting edge 406 is provided on the outside of the pressure-bearing main rod 405, a cutting tube cavity 407 is provided in the pressure-bearing main rod 405, and the cutting tube cavity 407 is coaxially arranged with the pressure-bearing main rod 405. A flange 409 is connected to the outer side of the pressure-bearing main rod 405 near the pressure sleeve 13 through a pin shaft, and also includes a coupling 408. Both ends of the coupling 408 are fixedly connected to the flange 409 and the nut seat 1301 respectively through torque transmission bolts. A cone head 401 is provided at the end away from the pressure-bearing sleeve 13. A cutting chamber 402 is provided in the cone head 401. The cone head 401 also includes a cutting tube 403. An ultrahigh-speed nozzle 410 is provided in the cutting tube 403. The angle between the ultrahigh-speed nozzle 410 and the tangent line of the outer side surface of the cone head 401 is acute. The cone head 401 also includes a rotating shaft sleeve 404. The rotating shaft sleeve 404 is provided on the outer side surface of the pressure-bearing main rod 405. The rotating shaft sleeve 404 and the cone head 401 are fixedly connected by a pin. The pressure-bearing main rod 405 rotates in conjunction with the cone head 401 through the rotating shaft sleeve 404.

[0024] In this embodiment, the screw rod 502 is fixedly connected to the hammer body of the hydraulic impact hammer 5, and the distance from the end face of the impact sleeve 501 away from the pressure-bearing sleeve 13 to the pressure plate of the pressure-bearing sleeve 13 is the same as the distance from the end face of the screw rod 502 close to the coupling 408 to the end face of the coupling 408, that is, when the hydraulic impact hammer 5 is working, the screw rod 502 hammers on the end face of the coupling 408 and the impact hammer body hammers on the end face of the pressure-bearing sleeve 13, thereby achieving the goal that the drill barrel 1 and the drill rod 4 are hammered by the hydraulic impact hammer 5 at the same time.

[0025] When the screw rod 502 moves along the central axis toward the coupling 408, since the screw rod 502 and the nut seat 1301 together form a ball screw, the nut seat 1301 rotates around its own axis under the action of the screw rod 502. At the same time, since the flange 409 at one end of the pressure-bearing main rod 405 is connected to the nut seat 1301 through the coupling 408, the nut seat 1301 drives the pressure-bearing main rod 405 to rotate around itself when it rotates, and then the impact hammer body of the hydraulic impact hammer 5 drives the screw rod 502 to move to the pressure plate of the pressure sleeve 13 and stops, and then transmits the hammer force to the drill barrel 1 and the drill rod 4 at the same time, so that the drill barrel 1 and the drill rod 4 are synchronously driven into the soil layer deep of the foundation pit wall. The cone head 401 of the drill rod 4 facilitates the movement of the drill rod 4 into the deep soil layer. At the same time, the drill barrel 1 is away from the cutting ring 2 at the end of the hydraulic impact hammer 5 to cut and squeeze the soil into the drill barrel 1. At this time, the pressure-bearing main rod 405 of the drill rod 4 stops rotating, and then the screw rod 502 moves away from the coupling 408 under the drive of the impact hammer body. At this time, the nut seat 1301 drives the pressure-bearing main rod 405 to rotate in the opposite direction, so that the soil squeezed into the inside of the drill barrel 1 during the hammering process moves toward the mud outlet pipe sleeve 3 through the spiral cutting edge 406. Then, when the drill rod 4 and the drill barrel 1 are hammered again, the pressure-bearing main rod 405 rotates forward to throw the soil near the mud outlet pipe sleeve 3 from the inside of the drill barrel 1 to the outside of the drill barrel 1.

[0026] In another embodiment, a rotary joint (using existing equipment) is provided at the end of the flange 409 away from the coupling 408, and the rotary joint is connected to the cutting tube cavity 407, and the outer side of the rotary joint is connected to the high-pressure air pump. In this embodiment, when the drilling depth of the drill rod 4 and the drill barrel 1 reaches a preset depth, the hydraulic impact hammer 5 stops working, and then high-pressure air is filled into the cutting tube cavity 407 in the pressure-bearing main rod 405 through an external high-pressure air pump. Then, gas cutting is performed on the borehole wall through the ultra-high-speed nozzle 410. At the same time, because the angle between the ultra-high-speed nozzle 410 and the tangent of the outer side surface of the cone head 401 is acute, the cone head 401 rotates about its own axis under the action of the reaction force of the high-speed gas, thereby impacting the borehole wall again and impacting an annular groove. Then, the output power of the high-pressure air pump is reduced, that is, the air pressure of the high-pressure air pump is reduced, and the drill rod 4 is removed and the borehole wall is cleaned by the low-pressure air flow.

[0027] In one embodiment, Figure 3-14 As shown, the top of the purlin 10 is provided with a fixing groove that cooperates with the web member 8. The web member 8 includes a jack 803 that cooperates with the fixing groove, and also includes a telescopic rod 801. The telescopic rod 801 is fixedly connected to the purlin 10 by bolts. A web member fork ear 802 is provided at the top of the telescopic rod 801. The web member fork ear 802 includes a fork ear plate that is integrally connected to the telescopic rod 801. A group of parallel splints are provided at the top of the fork ear plate. Fork ears 703 are provided between the web member fork ears 802. The fork ears 703 include a group of parallel fork ear splints. A channel plate is provided between the fork ear splints. The channel plate has a hole that passes through itself. Hole; the anchor seat 9 includes two anchor seat clamps arranged in parallel, and an anchor seat shell 901 is provided between the anchor seat clamps. The anchor seat shell 901 includes upper and lower shell plates and front and rear shell plates arranged in parallel, and also includes a front inclined plate and a rear inclined plate. An anchor seat partition 902 is provided inside the anchor seat shell 901, and a plurality of cable holes are opened on the anchor seat partition 902. The anchor seat shell 901 is fixedly connected to the purlin 10 by an anchor seat bolt 903. A weight block is provided in the anchor seat shell 901, and a groove for cooperating with the cable assembly 7 is opened on the weight block, and a fastening hole for fixing the fastening bolt 606 is opened on the rear shell plate.

[0028] The cable assembly 7 includes a cable 701, which passes through a fork ear 703. Both ends of the cable 701 are fixed in the anchor seat 9 by bolts. It also includes a pull rod 702. Both ends of the pull rod 702 are provided with a pin hole. Multiple pull rods 702 are connected end to end through the fork ear 703. The pull rod 702 is fixedly connected to the anchor seat 9 through a pin; the supporting truss assembly also includes a corbel 12, which includes a corbel mounting seat 1201, and a corbel mounting seat 1201 is provided at the bottom thereof. The corbel fixing block 1203 is provided with a pin seat at the top of the corbel mounting seat 1201, and a side support hydraulic rod 1202 is also provided at the top of the corbel mounting seat 1201, and the side support hydraulic rod 1202 is provided on both sides of the pin seat; the supporting side support 11 includes a side support plate 1101, and a pin splint 1102 is provided at the bottom end of the side support plate 1101, and the pin splint 1102 is connected to the pin seat through a pin, and the top of the side support hydraulic rod 1202 is hinged to the side support plate 1101.

[0029] The anchor rod 6 also includes a secondary anchor sleeve 604, one end of which is fixedly connected to the secondary steel cable 602, and also includes a main steel cable, which is arranged between the secondary anchor sleeve 604 and the cross brace 605, and a plurality of equally spaced fastening rings 603 are provided on the outside of the main steel cable, and a plurality of limiting teeth are provided on the outside of the fastening ring 603; the guide cone 601 includes a cone shell 607 and a cone top cover 611, the cone shell 607 is a hollow structure and is cone-shaped, the cone shell 607 is integrally connected to the cone top cover 611, the cone shell 607 includes a cone section and a cylindrical section, a telescopic hole connecting the inside and the outside is opened on the outer side of the cylindrical section of the cone shell 607, and a secondary steel cable hole connecting the inside and the outside is opened on the top of the cone top cover 611, and also includes The conical baffle 608 has a fan-shaped top-view cross-section, and the interior of the conical baffle 608 is hollow with the opening facing the center line of the guide cone 601. The conical baffle 608 slides with the telescopic hole, and also includes a secondary steel cable fixing plate 612, which is coaxially arranged with the conical shell 607, and the secondary steel cable 602 passes through the secondary steel cable hole and is fixedly connected to the secondary steel cable fixing plate 612. It also includes a cut-off rod 610 screwed to the bottom end of the secondary steel cable fixing plate 612, and the cut-off rod 610 is coaxially arranged with the secondary steel cable fixing plate 612. A plurality of retractable components 609 are hinged on the outer side of the cut-off rod 610, and the retractable components 609 are hinged to the conical baffle 608 away from the end of the cut-off rod 610.

[0030] The guide cone 601 also includes a retraction cylinder 613 screwed to the bottom end of the cone shell 607. The retraction cylinder 613 is hollow, and a cut-off rod hole is opened at the top of the retraction cylinder 613. A cut-off rod sealing sleeve 615 that slides with the cut-off rod 610 is provided on the inner side of the cut-off rod hole. A retraction spring 614 is provided on the outside of the retraction cylinder 613, and one end of the retraction spring 614 is fixedly connected to the cut-off rod 610.

[0031] The retracting and releasing assembly 609 includes a retracting rod hinge seat 621, a plurality of U-shaped hinge seat grooves 622 are provided on the outer side of the cut-off rod 610, the retracting rod hinge seat 621 and the hinge seat groove 622 are slidably matched, and also includes a hinge seat pneumatic rod 618, the hinge seat pneumatic rod 618 is arranged at the bottom end of the hinge seat groove 622, the top of the hinge seat pneumatic rod 618 is fixed to the retracting rod hinge seat 621, a lifting spring 619 is provided on the outer side of the hinge seat pneumatic rod 618, and also includes a horizontal push rod 617, the horizontal push rod 617 and the horizontal push rod The retracting rod hinge seat 621 is hinged and also includes a tilting push rod 616, one end of the tilting push rod 616 is hinged to the horizontal push rod 617, and the tilting push rod 616 is hinged to the cut-off rod 610 at the end away from the horizontal push rod 617. It also includes a thrust spring 620, one end of the thrust spring 620 is fixedly connected to the retracting rod hinge seat 621, and the end of the thrust spring 620 away from the retracting rod hinge seat 621 is fixedly connected to the middle part of the tilting push rod 616, and a tilting push rod groove that cooperates with the tilting push rod 616 is opened at the bottom end of the horizontal push rod 617.

[0032] In this embodiment, after the drill rod 4 and the drill tube 1 are taken out of the borehole, the guide cone 601 is placed into the bottom end of the borehole through the auxiliary steel cable 602 and the main steel cable, and then the main steel cable is pulled outward. When the main steel cable is pulled outward, the auxiliary steel cable 602 is driven to move outward. When the auxiliary steel cable 602 moves outward, the auxiliary steel cable fixing plate 612 is pulled from the retraction cylinder 613 toward the end of the cone top cover 611, and the retraction spring 614 is stretched. Since the auxiliary steel cable fixing plate 612 is fixedly connected to the cut-off rod 610, the bottom end of the cut-off rod 610 moves from the bottom end surface inside the retraction cylinder 613 to the cut-off rod sealing sleeve 615. At the same time, the air inside the retraction cylinder 613 is thin, and under the action of the external air pressure, a differential pressure is generated to retract the cut-off rod 610 to the bottom end surface inside the retraction cylinder 613. In the initial state, the articulated seat gas pressure rod 618 and the lifting spring 619 are in a compressed state, and the horizontal push rod 617 is away from the end of the cone baffle 608 and close to the end of the retraction cylinder 613, so that the tilting push rod 616 and the horizontal push rod 617 are in a folded state. When the cut-off rod 610 moves upward, the retracting rod articulated seat 621 of the horizontal push rod 617 moves upward under the action of the articulated seat gas pressure rod 618 and the lifting spring 619, thereby gradually unfolding the tilting push rod 616 and the horizontal push rod 617 from the folded state, and then the cone baffle 608 is retracted. Push it out from the cone shell 607, and then put the cone baffle 608 into the annular groove of the drilled hole, so as to preliminarily fix the guide cone 601. At the same time, the outer side surface of the inclined push rod 616 cooperates with the inner side surface of the cone shell 607, that is, the inclined push rod 616 is tightly fitted with the inner side surface of the cone shell 607, reinforcing the cone shell 607 to prevent the cone shell 607 from deforming under external pressure. Then, the cross brace 605 is fixed to the side brace plate 1101 supporting the side brace 11 and the corbel 12 by tightening the bolts 606; Then, the purlin 10 is a compression chord of the rafter frame, which is made of reinforced concrete and has a rectangular cross-section along the width direction. It is placed at the bottom of the foundation pit, and then a corbel 12 is set at the top of the purlin 10. The corbel fixing block 1203 of the corbel 12 fixes the corbel mounting seat 1201 to the purlin 10 through a screw, and a supporting side brace 11 is provided at the top of the corbel 12, that is, the corbel 12 is connected to the supporting side brace 11 through a pin shaft clamping plate 1102 and a pin shaft seat at the bottom end of the side brace plate 1101, and then the inclination angle of the side brace plate 1101 is adjusted by the side brace hydraulic rod 1202 installed at the top of the corbel mounting seat 1201, so that the side brace plate 1101 of the supporting side brace 11 is closely attached to the foundation pit wall; When the purlin 10 is squeezed, the purlin 10 will deform. In order to limit the deformation of the purlin 10, a plurality of webs 8 are installed on the top of the purlin 10. The webs 8 fix the telescopic rod 801 to the purlin 10 with bolts, and then the telescopic rod 801 is controlled by the jack 803. The cable assembly 7 is also included. Since the cable assembly 7 includes a cable 701, a rod 702 and a fork ear 703, the fork ear 703 is fixed to the web fork ear 802 by a screw, the cable 701 and the cable 701 are fixed from the left side. The support plates 1101 then pass through the fork ears 703 one by one and are fixedly connected to the side support plate 1101 on the right side. Thus, the deformation amplitude of the purlin 10 is controlled by the cable 701, the pull rod 702 and the length of the adjustable telescopic rod 801. That is, when the purlin 10 is concave downward, by reducing the length of the telescopic rod 801, the web member 8 pulls the pull rod 702 downward. Under the action of the interaction force, the tension of the web member 8 on the pull rod 702 acts on the purlin 10, pulling the purlin 10 from the downward concave state to the straight state. At the same time, both ends of the cable assembly 7 can be fixed on the anchor seat 9, and finally the anchor seat 9 can be fixed on the end face of the purlin 10, and can also be fixed on the side of the side support plate 1101 of the supporting side support 11, that is, the side support plate 1101 of the supporting truss assembly can not only provide support for the foundation pit wall, but also serve as a force support plate for the anchor rod 6 on the foundation pit wall. Finally, it can also be adjusted by adjusting the length of the cable 701, the pull rod 702 and the telescopic rod 801.

[0033] A method for assembling and disassembling a deep foundation pit support mechanism comprises the following steps: S1: Drilling the side wall of the foundation pit by hammering the drill rod 4 and the drill tube 1 with a hydraulic hammer 5. When the hydraulic hammer 5 strikes the pressure-bearing main rod 405, the screw rod 502 and the nut seat 1301 drive the pressure-bearing main rod 405 to rotate, thereby moving the soil toward the mud outlet pipe sleeve 3. When the hydraulic hammer 5 pulls back the screw rod 502, the pressure-bearing main rod 405 is driven to reverse, thereby bringing the soil out of the mud outlet pipe sleeve 3. S2: The anchor rod 6 is placed in the borehole, and then the main steel cable is pulled to pull the guide cone 601 outward. Then, the retractable assembly 609 is pulled by the auxiliary steel cable 602 to push the cone baffle 608 outward, thereby fixing the guide cone 601 in the borehole. The anchor rod is then grouted using the primary grouting method of buried pipe grouting, that is, grouting is carried out from the bottom of the hole upward with a pressure of not less than 0.6-0.8 MPa until the mortar overflows the hole mouth. When the soil is loose or the rock is broken and leakage is likely to occur, the secondary grouting method is used. S3: Place the purlin 10 of the supporting truss assembly at the bottom of the foundation pit, then fix the shape of the purlin 10 through the cable assembly 7 and the web 8, and fix the anchor rod 6 to the supporting side support 11 and the corbel 12.

[0034] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A deep foundation pit support mechanism, comprising a coaxially arranged drilling assembly and a hydraulic impact hammer, and also comprising an anchor rod and a support frame assembly, characterized in that: The drilling assembly includes a drill barrel, which is cylindrical and has a drill rod sleeved inside it. The hydraulic impact hammer and the drill rod are coaxially arranged; the supporting purlin assembly includes a purlin, an anchor seat is provided at the end away from the top of the purlin, a supporting side brace is provided at the top of the anchor seat, a cable assembly is provided between the two sides of the anchor seat, and also includes a web bar, which is provided between the purlin and the cable assembly; the anchor rod includes a guide cone, an auxiliary steel cable is provided at the top of the guide cone, a cross brace is provided at the end of the auxiliary steel cable away from the guide cone, and a fastening bolt is provided at the top of the cross brace.

2. The deep foundation pit support mechanism according to claim 1, characterized in that: The top of the purlin is provided with a fixing groove matched with the web rod, the web rod includes a jack matched with the fixing groove, and also includes a telescopic rod, the telescopic rod is fixedly connected to the purlin by bolts, a web rod fork ear is provided at the top of the telescopic rod, the web rod fork ear includes a fork ear plate integrally connected with the telescopic rod, a group of parallelly arranged clamping plates are provided at the top of the fork ear plate, fork ears are provided between the web rod fork ears, the fork ears include a group of parallelly arranged fork ear clamping plates, a channel plate is provided between the fork ear clamping plates, and the channel plate is provided with a hole running through itself; Anchor seat It includes two anchor seat clamps arranged in parallel, an anchor seat shell is provided between the anchor seat clamps, the anchor seat shell includes upper and lower shell plates and front and rear shell plates arranged in parallel, and also includes a front inclined plate and a rear inclined plate. An anchor seat partition is provided inside the anchor seat shell, a plurality of cable holes are opened on the anchor seat partition, the anchor seat shell is fixedly connected to the surrounding purlin through anchor seat bolts, a weight block is provided in the anchor seat shell, a groove for matching the cable assembly is opened on the weight block, and a fastening hole for fixing the fastening bolts is opened on the rear shell plate.

3. The deep foundation pit support mechanism according to claim 2, characterized in that: The cable assembly includes a cable, which passes through a fork ear. Both ends of the cable are fixed in the anchor seat by bolts. It also includes a pull rod. Both ends of the pull rod are provided with pin holes. Multiple pull rods are connected end to end through the fork ear, and the pull rod is fixedly connected to the anchor seat through a pin; the supporting truss assembly also includes a corbel, which includes a corbel mounting seat, a corbel fixing block is provided at the bottom end of the corbel mounting seat, a pin seat is provided at the top end of the corbel mounting seat, and a side support hydraulic rod is also provided at the top end of the corbel mounting seat, and the side support hydraulic rod is arranged on both sides of the pin seat; the supporting side support includes a side support plate, a pin splint is provided at the bottom end of the side support plate, the pin splint is connected to the pin seat through a pin, and the top end of the side support hydraulic rod is hinged to the side support plate.

4. The deep foundation pit support mechanism according to claim 1, characterized in that: The anchor rod also includes a secondary anchor sleeve, one end of which is fixedly connected to the secondary steel cable, and also includes a main steel cable, which is arranged between the secondary anchor sleeve and the cross brace, and a plurality of fastening rings arranged at equal intervals are provided on the outside of the main steel cable, and a plurality of limit teeth are provided on the outside of the fastening rings; the guide cone includes a cone shell and a cone top cover, the cone shell is a hollow structure and is cone-shaped, the cone shell and the cone top cover are integrally connected, the cone shell includes a cone section and a cylindrical section, a telescopic hole connecting the inside and the outside is opened on the outer side surface of the cylindrical section of the cone shell, and an auxiliary steel cable connecting the inside and the outside is opened on the top of the cone top cover The cone baffle plate has a fan-shaped top view cross section, is hollow inside and opens toward the center line of the guide cone, and is slidably matched with the telescopic hole. The cone baffle plate also includes a secondary steel cable fixing plate, which is coaxially arranged with the cone shell, and the secondary steel cable passes through the secondary steel cable hole and is fixedly connected with the secondary steel cable fixing plate. The cone baffle plate also includes a cut-off rod screwed to the bottom end of the secondary steel cable fixing plate, which is coaxially arranged with the secondary steel cable fixing plate, and a plurality of retractable components are hinged on the outer side of the cut-off rod, and the retractable components are hinged to the cone baffle plate away from the end of the cut-off rod.

5. The deep foundation pit support mechanism according to claim 4, characterized in that: The guide cone also includes a retraction cylinder screwed to the bottom end of the cone shell. The retraction cylinder is hollow and has a cut-off rod hole at the top. A cut-off rod sealing sleeve that slides with the cut-off rod is provided on the inner side of the cut-off rod hole. A retraction spring is provided on the outer side of the retraction cylinder, and one end of the retraction spring is fixedly connected to the cut-off rod.

6. The deep foundation pit support mechanism according to claim 5, characterized in that: The retracting and releasing assembly includes a retracting rod hinge seat, a plurality of U-shaped hinge seat grooves are opened on the outer side of the cut-off rod, the retracting rod hinge seat is slidably matched with the hinge seat groove, and also includes a hinge seat pneumatic rod, the hinge seat pneumatic rod is arranged at the bottom end in the hinge seat groove, the top of the hinge seat pneumatic rod is fixed to the retracting rod hinge seat, a lifting spring is provided on the outer side of the hinge seat pneumatic rod, and also includes a horizontal push rod, the horizontal push rod is hinged to the retracting rod hinge seat, and also includes a tilting push rod, one end of the tilting push rod is hinged to the horizontal push rod, and the tilting push rod is hinged to the cut-off rod at the end away from the horizontal push rod, and also includes a thrust spring, one end of the thrust spring is fixedly connected to the retracting rod hinge seat, the thrust spring is fixedly connected to the middle part of the tilting push rod away from the retracting rod hinge seat end, and a tilting push rod groove matching the tilting push rod is opened at the bottom end of the horizontal push rod.

7. The deep foundation pit support mechanism according to claim 1, characterized in that: A pressure sleeve is provided at one end of the drill barrel, a cutting ring sleeve is provided at the end of the drill barrel away from the pressure sleeve, a mud outlet is opened on the outer side of the drill barrel close to the pressure sleeve end, a mud outlet pipe sleeve is provided on the outer side of the drill barrel, a pressure sleeve retaining ring is provided on the outer side of the drill barrel, and the pressure sleeve retaining ring is integrally connected with the drill barrel; the pressure sleeve includes a pressure sleeve ring, the pressure sleeve ring is arranged at the end of the pressure sleeve retaining ring away from the mud outlet pipe sleeve, a pressure plate is provided at the top of the pressure sleeve ring, the pressure plate is in a circular ring shape, the pressure plate is integrally connected with the pressure sleeve ring, and also includes a nut seat, the nut seat is rotatably matched with the drill barrel, and a screw hole is provided in the nut seat.

8. The deep foundation pit support mechanism according to claim 7, characterized in that: The hydraulic impact hammer comprises an impact hammer body and an impact hammer shell. An impact sleeve is arranged near the pressure sleeve end of the impact hammer shell. The outer diameter of the pressure sleeve ring is smaller than the inner diameter of the impact sleeve. A screw rod is arranged near the pressure sleeve end of the impact hammer body. The screw rod is rotatably matched with the nut seat.

9. The deep foundation pit support mechanism according to claim 8, characterized in that: The drill rod includes a pressure-bearing main rod, a spiral cutting edge is provided on the outer side of the pressure-bearing main rod, a cutting tube cavity is provided in the pressure-bearing main rod, the cutting tube cavity and the pressure-bearing main rod are arranged coaxially, a flange is connected to the outer side surface of the pressure-bearing main rod close to the pressure-bearing sleeve through a pin shaft, and also includes a coupling, both ends of the coupling are fixedly connected to the flange and the nut seat respectively through torque transmission bolts, a cone head is provided at the end of the pressure-bearing main rod away from the pressure-bearing sleeve, a cutting chamber is provided in the cone head, and also includes a cutting tube, an ultra-high-speed nozzle is provided in the cutting tube, the angle between the ultra-high-speed nozzle and the tangent of the outer side surface of the cone head is an acute angle, and also includes a rotating shaft sleeve, the rotating shaft sleeve is provided on the outer side surface of the pressure-bearing main rod, the rotating shaft sleeve and the cone head are fixedly connected through a pin shaft, and the pressure-bearing main rod rotates with the cone head through the rotating shaft sleeve.

10. A method for assembling and disassembling the deep foundation pit support mechanism according to any one of claims 1 to 9, characterized in that: The steps include: S1: Drill holes on the side wall of the foundation pit by hammering the drill rod and the drill tube with a hydraulic impact hammer. When the hydraulic impact hammer hammers the pressure-bearing main rod, the screw rod and the nut seat drive the pressure-bearing main rod to rotate, thereby moving the soil toward the mud outlet pipe sleeve. When the hydraulic impact hammer pulls back the screw rod, the pressure-bearing main rod is driven to reverse, thereby bringing the soil out of the mud outlet pipe sleeve. S2: Place the anchor rod into the borehole, then pull the main steel cable to pull the guide cone outward, then use the auxiliary steel cable to pull the retractable assembly to push the cone baffle outward, thereby fixing the guide cone in the borehole, and then pour concrete into the borehole to fix it; S3: Place the purlin of the supporting truss assembly at the bottom of the foundation pit, then fix the shape of the purlin through the cable assembly and the web, and fix the anchor rods at the supporting side braces and the corbels.

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