An orifice support device for subway station foundation pit drilling excavation

Abstract

This invention relates to the field of subway station technology and discloses a borehole support device for excavating foundation pits in subway stations. The device includes: a toggle mechanism; a bearing installation mechanism located below the toggle mechanism; a counterweight bearing mechanism surrounding the bearing installation mechanism; three clamping mechanisms evenly distributed between the toggle mechanism and the bearing installation mechanism; an internal borehole support mechanism below the bearing installation mechanism; and three lifting and adjusting roller mechanisms surrounding the bearing installation mechanism. This borehole support device for excavating foundation pits in subway stations can provide internal support to the top of the borehole near the ground level during excavation through the internal borehole support mechanism. The toggle mechanism and the bearing installation mechanism provide compression at the top, thus forming a stable temporary support and preventing the soil at the top of the borehole from easily collapsing under pressure.

Description

Technical Field

[0001] This invention relates to the field of subway station technology, specifically to a borehole support device for drilling and excavation of subway station foundation pits. Background Technology

[0002] A subway is a type of urban rail transit system. It refers to a high-speed, high-capacity, electrically powered rail transit system built in cities. Trains run on fully enclosed tracks. Lines located in the city center are generally located in underground tunnels, while lines outside the city center are generally located on elevated bridges or at ground level. In addition to underground construction, subway lines can also be laid on elevated tracks or at ground level. Therefore, subway lines can have exclusive right-of-way and no level crossings.

[0003] When constructing a subway station, an underground foundation pit needs to be made. After the earthwork is excavated above the foundation pit, holes need to be drilled near both sides of the pit to provide locations for cast-in-place piles. During drilling, the drilling machinery is mostly set up above the borehole and drills from top to bottom. There is no support at the top of the borehole during drilling, and the soil at the top of the borehole is easily compressed and collapses, causing the borehole opening to be too large. Frequent adjustments are necessary when needed. Therefore, a borehole support device is needed for drilling and excavation of subway station foundation pits, so as to provide stable temporary support for the top of the borehole near the ground during drilling and prevent the soil at the top of the borehole from easily being compressed and collapsing. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a borehole support device for drilling and excavating foundation pits in subway stations, thus solving the problems mentioned in the background.

[0005] This invention provides the following technical solution: a borehole support device for drilling and excavation of subway station foundation pits, comprising: a toggle mechanism; a bearing installation mechanism disposed below the toggle mechanism; a counterweight bearing mechanism disposed around the bearing installation mechanism; a clamping mechanism installed between the toggle mechanism and the bearing installation mechanism, wherein the number of clamping mechanisms is three and the three clamping mechanisms are evenly distributed; a borehole inner support mechanism disposed below the bearing installation mechanism; a lifting and adjusting roller mechanism disposed around the bearing installation mechanism, wherein the number of lifting and adjusting roller mechanisms is three and the three lifting and adjusting roller mechanisms are evenly distributed; a toggle holding mechanism disposed at the top of the toggle mechanism; and an anti-slip positioning mechanism disposed at the bottom of the bearing installation mechanism.

[0006] Preferably, the actuating mechanism includes an actuating turntable, an inner liner ring, and actuating holes. The actuating turntable has a through hole in the middle, and the inner liner ring is fixedly connected to the inner wall of the hole. There are three actuating holes, and the three actuating holes are rotationally symmetrical about the center line of the actuating turntable. Each of the three actuating holes includes an oblique guide hole and a curved guide hole.

[0007] Preferably, the bearing installation mechanism includes a bearing plate, a central opening, a lifting column, a washer, a shaft seat, and a lifting ring seat. The bearing plate is disposed at the bottom of the rotary dial. The central opening is formed through the surface of the bearing plate and is located below the inner lining ring. The lifting column is fixedly inserted into the surface of the bearing plate. The lifting ring seat is fixedly connected to the upper part of the bearing plate through the lifting column. The washer is fixedly connected between the bearing plate and the lifting ring seat. The lifting ring seat is rotatably connected to the rotary dial through a bearing. The edge of the lifting ring seat has a notch. The shaft seat is fixedly connected to the edge of the bearing plate.

[0008] Preferably, the counterweight bearing mechanism includes a placement plate, an edge strip, and a drain hole. The placement plate is integrally disposed on the edge of the bearing plate, the edge strip is integrally disposed on the upper surface of the placement plate, and the drain hole is formed through the surface of the placement plate.

[0009] Preferably, the clamping mechanism includes a support block, a guide post, a connecting block, a compression spring, a lever pin, and a clamping plate. The support block is integrally disposed on the upper surface of the bearing plate. The guide post is slidably connected to the inner wall of the support block. The connecting block is integrally disposed at one end of the guide post. The compression spring is movably installed between the connecting block and the support block. The lever pin is fixedly inserted into the upper surface of the connecting block, and the surface of the lever pin is slidably connected to the inner wall of the lever hole, and the surface of the lever pin is movably connected to the inner wall of the notched groove.

[0010] Preferably, the orifice inner support mechanism includes an inner support cylinder, an upper support ring, and an anti-slip hole. The inner support cylinder is disposed below the bearing plate, and the inner wall of the inner support cylinder is movably connected to the surface of the clamping plate. The upper support ring is integrally disposed at the top of the inner support cylinder, and the anti-slip hole is formed through the surface of the inner support cylinder.

[0011] Preferably, the lifting and adjusting roller mechanism includes a guide plate, a threaded column, and a handwheel. The guide plate is fixedly connected to the surface of the bearing seat, the threaded column is rotatably connected to the inner wall of the bearing seat through a bearing, and the handwheel is fixedly sleeved on the top of the threaded column.

[0012] Preferably, the lifting and adjusting roller mechanism further includes a wheel slider, a lower edge shaft, a limiting ring, a wheel seat, and a movable roller. The wheel slider is slidably connected to the inner wall of the guide frame plate, and the inner wall of the wheel slider is slidably connected to the outer wall of the threaded column. The lower edge shaft is integrally disposed at the bottom of the wheel slider. The limiting ring is fixedly sleeved on the top end of the lower edge shaft. The wheel seat is rotatably connected to the surface of the lower edge shaft, and the movable roller is rotatably connected to the bottom of the wheel seat.

[0013] Preferably, the toggle holding mechanism includes an edge ring, a toggle post, and an anti-slip sleeve. The edge ring is fixedly connected to the upper surface of the toggle turntable, the toggle post is integrally disposed on the upper surface of the edge ring, and the anti-slip sleeve is fixedly sleeved on the upper surface of the toggle post.

[0014] Preferably, the anti-slip positioning mechanism includes a toothed plate and a positioning cone, both of which are fixedly connected to the bottom of the placement tray.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The borehole support device for excavating the foundation pit of the subway station, through the setting of a toggle mechanism, a load-bearing installation mechanism, a counterweight load-bearing mechanism, a clamping mechanism, an internal support mechanism at the borehole top near the ground, can form internal support through the internal support mechanism at the borehole top during drilling excavation, and provide top compression through the toggle mechanism and the load-bearing installation mechanism, thereby forming a stable temporary support and preventing the soil at the top of the borehole from easily collapsing due to pressure.

[0017] 2. The borehole support device for excavating the foundation pit of the subway station, through the setting of the placement plate, edge strip and drainage hole, can support the counterweight through the placement plate after the device is installed, so as to ensure that the device forms a more stable downward pressure and improve the compactness of the soil at the end of the borehole.

[0018] 3. The borehole support device for the excavation of the subway station foundation pit is equipped with a guide plate, threaded column and handwheel, so that the height of the device can be adjusted by turning the handwheel, which ensures that the device can be raised to improve flexibility when moving and lowered to improve stability when supporting.

[0019] 4. The borehole support device for drilling and excavation of the subway station foundation pit is equipped with a wheel block, lower edge shaft, limit ring, wheel seat and movable roller, so that the device can be moved by the movable roller auxiliary device when it is lifted.

[0020] 5. The borehole support device for drilling and excavation of the subway station foundation pit is equipped with toothed plates and positioning cones to improve the friction and positioning effect of the device during support, and to prevent the device from easily shifting. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the lifting and adjusting roller mechanism of the present invention when it is extended;

[0023] Figure 3 This is a schematic diagram of the structure of the present invention during operation;

[0024] Figure 4 This is a bottom view of the present invention;

[0025] Figure 5 This is a side sectional view of the present invention;

[0026] Figure 6 This is a schematic diagram of the exploded structure of the present invention;

[0027] Figure 7 This is a schematic diagram of the structure at the location of the orifice support mechanism of the present invention;

[0028] Figure 8 This is a schematic diagram of the lifting and adjusting roller mechanism of the present invention.

[0029] In the diagram: 101, actuating turntable; 102, inner liner ring; 103, actuating hole; 201, bearing plate; 202, intermediate opening; 203, lifting column; 204, washer ring; 205, shaft seat; 206, lifting ring seat; 301, placement plate; 302, edge strip; 303, drain hole; 401, support block; 402, guide post; 403, connecting block; 404, compression spring; 405, actuating hole. 406. Moving pin; 501. Clamping plate; 502. Inner support cylinder; 503. Upper support ring; 504. Anti-slip hole; 605. Guide frame plate; 606. Threaded post; 607. Handwheel; 608. Wheel slider; 609. Lower edge shaft; 600. Limiting ring; 601. Wheel seat; 602. Moving roller; 703. Edge ring; 704. Actuating post; 705. Anti-slip sleeve; 806. Toothed plate; 807. Positioning cone. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on 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.

[0031] Please see Figure 1-8A borehole support device for drilling excavation of subway station foundation pits includes: a toggle mechanism; a load-bearing installation mechanism disposed below the toggle mechanism; a counterweight load-bearing mechanism disposed around the load-bearing installation mechanism; three clamping mechanisms installed between the toggle mechanism and the load-bearing installation mechanism, the three clamping mechanisms being equally distributed; an inner borehole support mechanism disposed below the load-bearing installation mechanism; and three lifting and adjusting roller mechanisms disposed around the load-bearing installation mechanism, the three lifting and adjusting roller mechanisms being equally distributed. The top of the actuating mechanism is equipped with an actuating holding mechanism, and the bottom of the bearing installation mechanism is equipped with an anti-slip positioning mechanism. Through the actuating mechanism, bearing installation mechanism, counterweight bearing mechanism, clamping mechanism, borehole internal support mechanism, lifting and adjusting roller mechanism, actuating holding mechanism, and anti-slip positioning mechanism, internal support can be formed at the top of the borehole near the ground during drilling. The internal support mechanism at the borehole opening provides compression at the top through the actuating mechanism and bearing installation mechanism, thereby forming a stable temporary support and preventing the soil at the top of the borehole from easily collapsing due to pressure.

[0032] The actuation mechanism includes an actuation turntable 101, an inner liner ring 102, and actuation holes 103. A circular hole is provided through the center of the actuation turntable 101, and the inner liner ring 102 is fixedly connected to the inner wall of the circular hole. There are three actuation holes 103, and the three actuation holes 103 are rotationally symmetrical about the center line of the actuation turntable 101. Each of the three actuation holes 103 includes an oblique guide hole and a curved guide hole, so that the expansion and contraction of the clamping piece 406 can be controlled by the rotation of the actuation hole 103. The curved guide hole facilitates positioning after the clamping piece 406 reaches the end of the position.

[0033] The supporting installation mechanism includes a supporting plate 201, a central opening 202, a lifting column 203, a washer 204, a shaft seat 205, and a lifting ring seat 206. The supporting plate 201 is located at the bottom of the actuating turntable 101. The central opening 202 is formed through the surface of the supporting plate 201 and is located below the inner lining ring 102. The lifting column 203 is fixedly inserted into the surface of the supporting plate 201. The lifting ring seat 206 is fixedly connected to the top of the supporting plate 201 through the lifting column 203. The washer 204 is fixedly connected between the supporting plate 201 and the lifting ring seat 206. The lifting ring seat 206 is rotatably connected to the actuating turntable 101 through a bearing. The edge of the lifting ring seat 206 is provided with a notch. The shaft seat 205 is fixedly connected to the edge of the supporting plate 201 so that the supporting plate 201 and the actuating turntable 101 can rotate relative to each other, ensuring that the actuating pin 405 can be misaligned and actuated when pressed.

[0034] The counterweight bearing mechanism includes a placement plate 301, an edge strip 302, and a drainage hole 303. The placement plate 301 is integrally set on the edge of the bearing plate 201, the edge strip 302 is integrally set on the upper surface of the placement plate 301, and the drainage hole 303 is opened through the surface of the placement plate 301. Through the placement plate 301, the edge strip 302, and the drainage hole 303, the counterweight can be supported by the placement plate 301 after the device is installed, ensuring that the device forms a more stable downward pressure and improving the compactness of the soil at the borehole end.

[0035] The clamping mechanism includes a support block 401, a guide post 402, a connecting block 403, a compression spring 404, an actuating pin 405, and a clamping plate 406. The support block 401 is integrally mounted on the upper surface of the bearing plate 201. The guide post 402 is slidably connected to the inner wall of the support block 401. The connecting block 403 is integrally mounted on one end of the guide post 402. The compression spring 404 is movably mounted between the connecting block 403 and the support block 401. The actuating pin 405 is fixedly inserted into the upper surface of the connecting block 403, and the surface of the actuating pin 405 is slidably connected to the inner wall of the actuating hole 103, and the surface of the actuating pin 405 is movably connected to the inner wall of the notched hole, so that the main body of the device can be stably connected to the hole support mechanism through the clamping plate 406, ensuring that the device can form an integrated support for the inside and top of the borehole.

[0036] The orifice support mechanism includes an inner support cylinder 501, an upper support ring 502, and an anti-slip hole 503. The inner support cylinder 501 is located below the bearing plate 201, and the inner wall of the inner support cylinder 501 is movably connected to the surface of the clamping piece 406. The upper support ring 502 is integrally located at the top of the inner support cylinder 501, and the anti-slip hole 503 is formed through the surface of the inner support cylinder 501.

[0037] The lifting and adjusting roller mechanism includes a guide plate 601, a threaded column 602, and a handwheel 603. The guide plate 601 is fixedly connected to the surface of the bearing 205. The threaded column 602 is rotatably connected to the inner wall of the bearing 205 through a bearing. The handwheel 603 is fixedly sleeved on the top of the threaded column 602. The guide plate 601, threaded column 602, and handwheel 603 are designed to allow the height of the device to be adjusted by turning the handwheel 603, ensuring that the device can be raised to improve flexibility when moving and lowered to improve stability when supported.

[0038] The lifting and adjusting roller mechanism includes a wheel slider 604, a lower edge shaft 605, a limiting ring 606, a wheel seat 607, and a movable roller 608. The wheel slider 604 is slidably connected to the inner wall of the guide frame plate 601, and the inner wall of the wheel slider 604 is slidably connected to the outer wall of the threaded column 602. The lower edge shaft 605 is integrally set at the bottom of the wheel slider 604. The limiting ring 606 is fixedly sleeved on the top of the lower edge shaft 605. The wheel seat 607 is rotatably connected to the surface of the lower edge shaft 605. The movable roller 608 is rotatably connected to the bottom of the wheel seat 607. The wheel slider 604, lower edge shaft 605, limiting ring 606, wheel seat 607, and movable roller 608 are arranged to facilitate the movement of the device by the movable roller 608 when the device is lifted.

[0039] The toggle holding mechanism includes an edge ring 701, a toggle post 702, and an anti-slip sleeve 703. The edge ring 701 is fixedly connected to the upper surface of the toggle turntable 101. The toggle post 702 is integrally set on the upper surface of the edge ring 701. The anti-slip sleeve 703 is fixedly sleeved on the upper surface of the toggle post 702 to provide a force point when toggle the toggle turntable 101 and ensure the convenience of toggle.

[0040] The anti-slip positioning mechanism includes a toothed plate 801 and a positioning cone 802. Both the toothed plate 801 and the positioning cone 802 are fixedly connected to the bottom of the placement plate 301. The toothed plate 801 and the positioning cone 802 are designed to improve the friction and positioning effect when the device is supported, thus preventing the device from easily shifting.

[0041] Working principle: In use, first, a shallow hole is drilled at the designated location. Then, the inner support cylinder 501 is attached to the top of the hole. Next, the main body of the device is moved above the inner support cylinder 501, and the support plate 201 is fixed. The edge ring 701 is turned to make the actuating turntable 101 rotate relative to the support plate 201. When the actuating turntable 101 rotates, it will press the actuating pin 405 through the actuating hole 103. After the actuating pin 405 is pressed, the guide post 402, the connecting block 403, the compression spring 404, and the actuating pin... Pin 405 and clamping piece 406 slide along support block 401 toward the middle of bearing plate 201. After sliding to the end of the position, turn handwheel 603 to drive threaded post 602 to rotate, which pushes wheel slider 604 through the thread, causing the actuating turntable 101 and bearing plate 201 to descend relative to each other and gradually approach the ground. After the lower surface of bearing plate 201 is in complete contact with the ground, the bearing plate 201 is fixed. Then, turn edge ring 701 in the opposite direction to make actuating turntable 101 rotate in the opposite direction relative to bearing plate 201. When disk 101 rotates in the reverse direction, it presses the actuating pin 405 through the actuating hole 103. After the actuating pin 405 is pressed, the guide post 402, connecting block 403, compression spring 404, actuating pin 405, and clamping plate 406 slide along the support block 401 toward the outer periphery of the bearing disk 201. The three clamping plates 406 are relatively spread out until they slide to the end of their position. The three clamping plates 406 form a stable support and fixation on the inner wall of the inner support cylinder 501, and a digging channel is reserved in the middle. At the same time, the actuating pin 405 is pressed. Pin 405 slides into the curved guide hole of the actuating hole 103 to form a positioning. The elastic force of the compression spring 404 forms a compression to ensure that the clamping piece 406 is difficult to move inward and disengage. Then, the position of the device is slightly adjusted, and a counterweight is placed above the placement plate 301. The positioning cone 802 is pressed and inserted into the soil to cooperate with the toothed plate 801 to ensure the stability of the device. This makes the device form a stable support above the borehole, avoids the borehole from collapsing, and ensures stable excavation construction from the reserved channel in the middle of the device during subsequent drilling.

[0042] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A borehole support device for drilling and excavation of subway station foundation pits, characterized in that, include: The actuating mechanism includes a supporting mounting mechanism below it, a counterweight supporting mechanism around the supporting mounting mechanism, a clamping mechanism between the actuating mechanism and the supporting mounting mechanism (three clamping mechanisms equidistantly distributed), an orifice inner support mechanism below the supporting mounting mechanism, and a lifting and adjusting roller mechanism (three lifting and adjusting roller mechanisms equidistantly distributed) around the supporting mounting mechanism. A toggle gripping mechanism is located at the top of the actuating mechanism, and an anti-slip positioning mechanism is located at the bottom of the supporting mounting mechanism. The actuation mechanism includes an actuation turntable (101), an inner liner ring (102), and actuation holes (103). The actuation turntable (101) has a through hole in the middle. The inner liner ring (102) is fixedly connected to the inner wall of the hole. There are three actuation holes (103), and the three actuation holes (103) are rotationally symmetrical about the center line of the actuation turntable (101). Each of the three actuation holes (103) includes an oblique guide hole and a curved guide hole. The bearing installation mechanism includes a bearing plate (201), a central opening (202), a lifting column (203), a washer (204), a bearing seat (205), and a lifting ring seat (206). The bearing plate (201) is located at the bottom of the actuating turntable (101). The central opening (202) is formed through the surface of the bearing plate (201) and is located below the inner lining ring (102). The lifting column (203) is fixedly inserted into the bearing plate. The surface of the disk (201) is provided with the lifting ring seat (206) fixedly connected above the bearing disk (201) by the lifting column (203), the pad ring (204) fixedly connected between the bearing disk (201) and the lifting ring seat (206), and the lifting ring seat (206) is rotatably connected to the actuating turntable (101) by the bearing, and the edge of the lifting ring seat (206) is provided with a notch, and the shaft seat (205) is fixedly connected to the edge of the bearing disk (201); The counterweight bearing mechanism includes a placement plate (301), an edge strip (302), and a drain hole (303). The placement plate (301) is integrally disposed on the edge of the bearing plate (201), the edge strip (302) is integrally disposed on the upper surface of the placement plate (301), and the drain hole (303) is opened through the surface of the placement plate (301). The clamping mechanism includes a support block (401), a guide post (402), a connecting block (403), a compression spring (404), an actuating pin (405), and a clamping plate (406). The support block (401) is integrally disposed on the upper surface of the bearing plate (201). The guide post (402) is slidably connected to the inner wall of the support block (401). The connecting block (403) is integrally disposed at one end of the guide post (402). The compression spring (404) is movably installed between the connecting block (403) and the support block (401). The actuating pin (405) is fixedly inserted into the upper surface of the connecting block (403), and the surface of the actuating pin (405) is slidably connected to the inner wall of the actuating hole (103), and the surface of the actuating pin (405) is movably connected to the inner wall of the notched groove. The orifice support mechanism includes an inner support cylinder (501), an upper support ring (502), and an anti-slip hole (503). The inner support cylinder (501) is located below the bearing plate (201), and the inner wall of the inner support cylinder (501) is movably connected to the surface of the clamping piece (406). The upper support ring (502) is integrally located at the top of the inner support cylinder (501), and the anti-slip hole (503) is opened through the surface of the inner support cylinder (501). The lifting and adjusting roller mechanism includes a guide plate (601), a threaded column (602), and a handwheel (603). The guide plate (601) is fixedly connected to the surface of the bearing seat (205). The threaded column (602) is rotatably connected to the inner wall of the bearing seat (205) through a bearing. The handwheel (603) is fixedly sleeved on the top of the threaded column (602). The lifting and adjusting roller mechanism also includes a wheel slider (604), a lower edge shaft (605), a limiting ring (606), a wheel seat (607), and a movable roller (608). The wheel slider (604) is slidably connected to the inner wall of the guide frame plate (601), and the inner wall of the wheel slider (604) is slidably connected to the outer wall of the threaded column (602). The lower edge shaft (605) is integrally set at the bottom of the wheel slider (604). The limiting ring (606) is fixedly sleeved on the top of the lower edge shaft (605). The wheel seat (607) is rotatably connected to the surface of the lower edge shaft (605), and the movable roller (608) is rotatably connected to the bottom of the wheel seat (607).

2. The borehole support device for drilling and excavation of subway station foundation pits according to claim 1, characterized in that, The toggle gripping mechanism includes an edge ring (701), a toggle post (702), and an anti-slip sleeve (703). The edge ring (701) is fixedly connected to the upper surface of the toggle turntable (101). The toggle post (702) is integrally disposed on the upper surface of the edge ring (701). The anti-slip sleeve (703) is fixedly sleeved on the upper surface of the toggle post (702).

3. The borehole support device for drilling and excavation of subway station foundation pits according to claim 1, characterized in that, The anti-slip positioning mechanism includes a toothed plate (801) and a positioning cone (802), both of which are fixedly connected to the bottom of the placement plate (301).

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