Foundation pit supporting structure based on old basement outer wall structure

Abstract

The invention relates to the technical field of foundation pit supporting, in particular to a foundation pit supporting structure based on an old basement outer wall structure, which comprises a foundation pit main body and an outer wall main body, the outer wall main body is located at the vertical boundary of the periphery of the foundation pit main body, and supporting holes are formed in the outer wall main body in the longitudinal direction and the transverse direction of the outer wall main body; the blind end of the supporting hole extends into soil on one side of the outer wall body. A guide cone is arranged at the bottom of the supporting hole, a supporting rod is fixedly connected to the inner wall of the guide cone and is exposed out of the supporting hole, a positioning ring is arranged on the outer side of the supporting rod and is coaxial with the guide cone, through holes are symmetrically formed in the outer side of the positioning ring, and a positioning plate is welded to the inner wall of the positioning ring; according to the outer wall supporting device, the supporting strength can be guaranteed, meanwhile, loss of an outer wall is reduced, and the outer wall supporting device has the advantage of being high in supporting strength.

Description

Technical Field

[0001] The invention relates to the technical field of foundation pit support, and in particular to a foundation pit support structure based on an old basement outer wall structure. Background Art

[0002] In recent years, due to the rapid development of urban subway projects, subway stations and local open excavation also involve a large amount of foundation pit engineering. In subway stations with double-line intersections, the foundation pit is as deep as 20-30m. Water conservancy and electricity also have the problem of foundation pit excavation for underground plants and underground pump rooms. Whether it is a high-rise building or a deep foundation pit project for subways, since they are all excavated in the city, there are usually various structures such as traffic arteries, existing buildings or pipelines around the foundation pit, which involves a very important content of foundation pit excavation, and it is necessary to protect the safe use of surrounding structures. However, most of the general foundation pit supports are temporary structures, with large investments and easy to cause waste, but unsafe support structures are bound to cause engineering accidents.

[0003] In the renovation of old houses, especially in the renovation of old basement buildings, in order to achieve the effect of reusing old buildings and saving energy, the original outer wall of the basement is often used as a supporting part to support the inner wall of the foundation pit. In this method, the holes used for filling and pouring concrete are straight holes, and the essence of its support is the friction between the soil. Therefore, when carrying out support construction under this method, it is necessary to build in multiple supporting parts, or increase the relative depth of the soil for reinforcement. Otherwise, the overall support strength is low, and the corresponding demand for the aperture of the original basement outer wall increases. Large-diameter drilling is easy to cause unnecessary damage to the outer wall as a whole. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides a foundation pit supporting structure based on the outer wall structure of an old basement.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a foundation pit support structure based on the outer wall structure of an old basement, comprising a foundation pit body and an outer wall body, wherein the outer wall body is located at the vertical boundaries around the foundation pit body, and support holes are opened in the inner part of the outer wall body along the longitudinal and transverse directions, and the blind end of the support hole extends to the soil on one side of the outer wall body; A guide cone is provided at the bottom of the support hole, a support rod is fixedly connected to the inner wall of the guide cone, and the support rod is exposed outside the support hole, a positioning ring is provided on the outer side of the support rod and at a position coaxial with the guide cone, through holes are symmetrically opened on the outer side of the positioning ring, a positioning plate is welded on the inner wall of the positioning ring, and the positioning plate can be slidably sleeved on the outer wall of the support rod, an auxiliary rod is rotatably installed at the center position of the positioning plate, a positioning piece is provided at one end of the support rod close to the support hole, a pier is placed on the side wall of the outer wall body and at the position of the support hole, the pier passes through the support rod and is close to the outer wall of the pier, and the position of the pier is locked by fixing the locking cap to the support rod; An opening portion is provided at the inner ring of the positioning ring, and a secondary opening operation is performed on the supporting hole through the opening portion.

[0006] Specifically, the opening portion includes an inner circular guide rail fixed in the center on the inner wall of the positioning ring, a displacement block is slidably installed inside the inner circular guide rail, and a rotating head is rotatably installed at both ends of the displacement block, and a hole opening cutter head is fixedly installed at the end of the rotating head, and the hole opening cutter head is welded by two types of arc blades, a guide groove is opened at the center bottom position of the inner wall of the inner circular guide rail, and the guide groove is composed of a combination of a straight groove and an arc groove, a limiting protrusion is installed on the outer wall of the rotating head, and the limiting protrusion is located in the guide groove, and a swing arm is hinged on the outer wall of the displacement block facing the opening of the inner circular guide rail, and the end of the swing arm is connected to the limiting toothed disc through a round rod, and a positioning toothed disc is fixedly installed on the outer side wall of the positioning plate in the center, and the positioning toothed disc and the limiting toothed disc are connected by a chain, and the end of the auxiliary rod passes through the positioning toothed disc, and the auxiliary rod passes through one end of the positioning toothed disc and a driving arm is installed, and one end of the driving arm is sleeved on the outer wall of the round rod.

[0007] Specifically, a mounting hole is provided at the center of the inner wall of the displacement block, a placement groove is provided at the center of the inner wall of the inner circular guide rail, a guide rod is horizontally installed at the center of the placement groove, and the guide rod is welded by a straight rod and a wavy rod, a sliding sleeve is sleeved on the outer wall of the guide rod, a connecting rod is welded on the outer wall of the sliding sleeve, the end of the connecting rod passes through the mounting hole and is located at the center of the inner circular guide rail, the end of the connecting rod is fixedly connected to a shift plate, and both ends of the shift plate extend to the center position inside the two hole-opening cutter heads.

[0008] Specifically, two ends of the inner circular guide rail are provided with leakage grooves at the lower position, and the leakage grooves are directly opposite to the wavy rod area of ​​the guide rod. A tray is arranged directly below the leakage groove, and the side wall of the tray is connected to the inner wall of the positioning ring through a fixing rod.

[0009] Specifically, a baffle is installed on the inner wall of the rotating head, and a square hole is opened at the connection between the baffle and the dial plate.

[0010] Specifically, a ball is installed at the connection between the displacement block and the rotating head, and the outer surface of the ball is coated with lubricating grease.

[0011] Specifically, the outer surface of the auxiliary rod is a frosted surface, and a hexagonal socket is provided at the end of the auxiliary rod.

[0012] Specifically, the limiting protrusion is connected to the rotating head via a thread, and the limiting protrusion is a high-strength metal structure with a smooth outer wall.

[0013] Beneficial effects of the present invention: The present invention discloses a foundation pit supporting structure based on the exterior wall structure of an old basement. The present invention is provided with components such as an opening portion. In this manner, the concrete not only relies on the friction between the concrete and the soil as the main supporting anti-pulling force, but also performs a secondary transformation on the pouring area of ​​the concrete on this basis, thereby increasing the contact area between the concrete and the soil, making the connection with the soil tighter, reducing the number of supporting rods used, meeting the demand for opening smaller supporting holes, having little effect on the overall structural rigidity of the exterior wall body, and making the exterior wall body structure not easily damaged. The present invention discloses a foundation pit supporting structure based on the outer wall structure of an old basement. When the hole punching cutter head is recovered to the inner side of the inner circular guide rail after the secondary excavation is completed, the sliding sleeve will move along the outer wall of the wavy guide rod after moving a certain distance. The movement of the sliding sleeve drives the connecting rod and the paddle plate to reciprocate up and down. The reciprocating paddle plate breaks up the soil stored in the hole punching cutter head to prevent the soil stored in the hole punching cutter head from being unable to fall off by itself under clay soil, and the soil sliding down from the leakage groove will directly fall into the tray to prevent the broken soil generated during the secondary excavation from entering the support hole again, thereby ensuring that the main body after casting and forming in the support hole is cylindrical and does not affect the shape of the concrete casting and forming area. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a partial view of the guide cone of the present invention; Figure 3 is a stereogram of a positioning ring of the present invention; Figure 4 A three-dimensional diagram of a displacement block of the present invention; Figure 5 For the present invention Figure 3 MM's interface diagram; Figure 6 Figure 1 of the present invention Figure 5 A magnified schematic diagram of region A; Figure 7 The overall structure of the concrete of the present invention; In the figure: 1. foundation pit body; 2. outer wall body; 3. guide cone; 4. support rod; 5. positioning ring; 50. through hole; 51. positioning plate; 52. auxiliary rod; 53. opening part; 6. positioning piece; 7. pad; 8. locking cap; 9. pad; 531. inner circle guide rail; 532. displacement block; 533. rotating head; 534. opening cutter head; 535. guide groove; 536. limiting protrusion; 537. swing arm; 538. limiting tooth plate; 521. positioning tooth plate; 522. driving arm; 523. chain; 501. mounting hole; 502. placement groove; 503. guide rod; 504. sliding sleeve; 505. connecting rod; 506. dial plate; 507. leakage groove; 508. tray; 509. baffle. DETAILED DESCRIPTION

[0016] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0017] In addition, the terms used below are defined based on the functions of the present invention and may differ depending on the intention or custom of the user or operator. Therefore, these terms are defined based on the entire contents of this specification.

[0018] See also Figure 1-7 The foundation pit support structure based on the exterior wall structure of an old basement described in the present invention comprises a foundation pit body 1 and an exterior wall body 2. The exterior wall body 2 is located at the vertical boundaries around the foundation pit body 1. Support holes are opened in the interior of the exterior wall body 2 along its longitudinal and transverse directions. The blind ends of the support holes extend into the soil on one side of the exterior wall body 2. The support holes are directly constructed by a drilling machine. The diameter of the support holes is 8-10 cm, and the relative inclination angle is 15°-25° downward from the horizontal. A guide cone 3 is provided at the bottom of the support hole. The size of the guide cone 3 generally matches the size of the support hole. A support rod 4 is fixedly connected to the inner wall of the guide cone 3. The support rod 4 can be any one of an anchor cable or a steel bar, and the support rod 4 is exposed outside the support hole. A positioning ring 5 is provided on the outer side of the support rod 4 and at a coaxial position with the guide cone 3. Through holes 50 are symmetrically opened on the outer side of the positioning ring 5. A positioning plate 51 is welded to the inner wall of the positioning ring 5, and the positioning plate 51 can be slidably sleeved on the outer wall of the support rod 4. An auxiliary rod 52 is rotatably installed at the center of the positioning plate 51. The inner circle of the positioning ring 5 A hole opening portion 53 is provided. After the construction of the support hole is completed, the positioning ring 5 is put on the support rod 4, the guide cone 3 is aligned with the support hole, and the auxiliary rod 52 is used to put it, the support rod 4 and the hole opening portion 53 into the support hole. The support hole is opened for the second time through the hole opening portion 53. The auxiliary rod 52 can pull the hole opening portion 53 to adjust the position of the secondary hole opening to ensure that the distance between adjacent holes of the secondary hole opening is 40-55cm. After the secondary hole opening is completed, concrete is poured from the hole mouth of the support hole (it can also be poured by a pouring pipe). After the concrete is cooled, the combined shape of the concrete and the support rod 4 can be as shown in FIG. Figure 7 As shown; A positioning piece 6 is provided at one end of the supporting rod 4 close to the supporting hole, and a pier 9 is placed on the side wall of the outer wall body 2 and located at the supporting hole. The pad 7 passes through the supporting rod 4 and is close to the outer wall of the pier 9. The position of the pad 7 is locked by fixing the locking cap 8 with the supporting rod 4. The installation of the pad 7, locking cap 8 and pier 9 should be carried out after pouring concrete.

[0019] In another embodiment, see Figure 2-Figure 6The opening portion 53 includes an inner circular guide rail 531 fixed centrally on the inner wall of the positioning ring 5, a displacement block 532 is slidably installed inside the inner circular guide rail 531, and a rotating head 533 is rotatably installed at both ends of the displacement block 532. The diameter of the rotating head 533 is smaller than the diameter of the through hole 50. A hole-opening cutter head 534 is fixedly installed at the end of the rotating head 533. The hole-opening cutter head 534 is welded by two L-shaped arc blades. A guide groove 535 is opened at the bottom center of the inner wall of the inner circular guide rail 531. The guide groove 535 is composed of a straight groove and an arc groove. A limiting protrusion 536 is installed on the outer wall of the rotating head 533. The limiting protrusion 536 is located in the guide groove 535, and the outer wall of the displacement block 532 facing the opening of the inner circular guide rail 531 is hinged with a swing arm 537, and the end of the swing arm 537 is connected to the limiting toothed disc 538 through a round rod. A positioning toothed disc 521 is fixedly installed on the outer wall of the positioning plate 51 in the middle, and the positioning toothed disc 521 and the limiting toothed disc 538 are connected by a chain 523. The end of the auxiliary rod 52 passes through the positioning toothed disc 521, and a driving arm 522 is installed at one end of the auxiliary rod 52 passing through the positioning toothed disc 521. One end of the driving arm 522 is sleeved on the outer wall of the round rod. When working, the auxiliary rod 52 is rotated to The driving arm 522 can be driven to swing. The swinging driving arm 522 directly acts on one end of the swing arm 537 through the round rod, generating a horizontal reciprocating thrust on the swing arm 537. At the same time, the limiting toothed disc 538 performs a circular motion relative to the positioning toothed disc 521 under the constraint of the chain 523. The thrust generated by the swing arm 537 drives the displacement block 532 to move on the inner wall of the inner circular guide rail 531. During the movement, the limiting protrusion 536 is always in the guide groove 535. When the displacement block 532 moves to the hole opening cutter head 534 and leaks out of the through hole 50, the limiting protrusion 536 will enter the arc groove from the straight groove area of ​​the guide groove 535. The inner wall of the arc groove area applies a circumferential extrusion force to the relative limiting protrusion 536, so that the rotating head 533 rotates relative to the displacement block 532, that is, the hole-punching cutter head 534 rotates. When the hole-punching cutter head 534 contacts the soil, the hole-punching cutter head 534 performs a secondary hole-punching operation on the soil in contact with it. The soil generated by the secondary hole-punching of the hole-punching cutter head 534 will fall from the gap of the hole-punching cutter head 534. In this way, the concrete not only relies on the friction between the concrete and the soil as the main supporting anti-pulling force, but also performs a secondary transformation on the concrete pouring area on this basis, so that the shape of the poured concrete area is as follows: Figure 7 As shown, the contact area between concrete and soil is increased, and the connection with soil is tighter, which can reduce the number of support rods 4 used, meet the demand for opening smaller support hole diameters, and have little impact on the overall structural rigidity of the exterior wall body 2.

[0020] In another embodiment, see Figure 2-Figure 7A mounting hole 501 is provided at the center of the inner wall of the displacement block 532, a placement groove 502 is provided at the center of the inner wall of the inner circular guide rail 531, a guide rod 503 is horizontally installed at the center of the placement groove 502, and the guide rod 503 is welded by a straight rod and a wavy rod, a sliding sleeve 504 is sleeved on the outer wall of the guide rod 503, a connecting rod 505 is welded on the outer wall of the sliding sleeve 504, the end of the connecting rod 505 passes through the mounting hole 501 and is located at the center of the inner circular guide rail 531, and a dial plate 506 is fixedly connected to the end of the connecting rod 505, and both ends of the dial plate 506 extend to the inner center of the two hole-opening cutter heads 534, and the displacement block 5 During the reciprocating motion of the inner wall of the inner circular guide rail 531, the sleeve 504 is always sleeved on the outer wall of the guide rod 503 and slides along the outer wall thereof. During specific operation, after the hole punching head 53 has completed the secondary hollowing, when the hole punching head 53 is recovered to the inner side of the inner circular guide rail 531 again, the sleeve 504 moves a certain distance and then moves along the outer wall of the wavy guide rod 503. The movement of the sleeve 504 drives the connecting rod 505 and the paddle plate 506 to reciprocate up and down. The reciprocating paddle plate 506 breaks up the soil stored in the hole punching head 534 to prevent the soil stored in the hole punching head 534 from being unable to fall off by itself under clay soil.

[0021] For further information, see Figure 3 , leakage grooves 507 are provided at the lower positions of both ends of the inner circular guide rail 531, and the leakage grooves 507 increase the space for soil to fall during the secondary excavation, and the leakage grooves 507 are opposite to the wavy rod area of ​​the guide rod 503, ensuring that when its sliding sleeve 504 slides to the wavy rod area of ​​the guide rod 503, the soil in the hole-opening cutter head 534 will fall from the leakage grooves 507, and a tray 508 is arranged directly below the leakage grooves 507. The side walls of the tray 508 are connected to the inner wall of the positioning ring 5 through a fixing rod, and the soil sliding from the leakage grooves 507 will directly fall into the tray 508, preventing the broken soil generated during the secondary excavation from entering the support hole again, ensuring that the main body after casting in the support hole is cylindrical, and does not affect the shape of the concrete casting area.

[0022] See also Figure 6 A baffle 509 is installed on the inner wall of the rotating head 533, and the volume in the single hole-opening cutter head 534 is blocked by the baffle 509. A square hole is opened at the connection between the baffle 509 and the paddle plate 506, and the square hole provides space for the movement of the paddle plate 506 to ensure that the paddle plate 506 can perform reciprocating motion normally.

[0023] See also Figure 6 A ball is installed at the connection between the displacement block 532 and the rotating head 533, and the outer surface of the ball is coated with lubricating grease, so that the friction between the two is reduced by the ball and the grease.

[0024] See also Figure 1The outer surface of the auxiliary rod 52 is a frosted surface to increase the friction of the outer surface, and a hexagonal groove is provided at the end of the auxiliary rod 52, and the auxiliary rod 52 can be driven by a hexagonal wrench.

[0025] Specifically, the limiting protrusion 536 is connected to the rotating head 533 via a threaded connection, so that the limiting protrusion 536 is detachable, and the limiting protrusion 536 is a high-strength metal structure with a smooth outer wall, thereby increasing its overall strength.

[0026] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A foundation pit support structure based on an old basement outer wall structure, comprising a foundation pit main body (1) and an outer wall main body (2), characterized in that: The outer wall body (2) is located at the vertical boundaries of the foundation pit body (1), and support holes are opened in the inner part of the outer wall body (2) along the longitudinal and transverse directions, and the blind ends of the support holes extend into the soil on one side of the outer wall body (2); A guide cone (3) is provided at the bottom of the support hole, a support rod (4) is fixedly connected to the inner wall of the guide cone (3), and the support rod (4) is exposed outside the support hole, a positioning ring (5) is provided on the outer side of the support rod (4) and at a position coaxial with the guide cone (3), through holes (50) are symmetrically opened on the outer side of the positioning ring (5), a positioning plate (51) is welded to the inner wall of the positioning ring (5), and the positioning plate (51) can be slidably sleeved on the outer wall of the support rod (4), an auxiliary rod (52) is rotatably installed at the center position of the positioning plate (51), a positioning piece (6) is provided at one end of the support rod (4) close to the support hole, a cushion pier (9) is placed on the side wall of the external wall body (2) and at the position of the support hole, the cushion plate (7) passes through the support rod (4) and is close to the outer wall of the cushion pier (9), and the position of the cushion plate (7) is locked by fixing the locking cap (8) to the support rod (4); An opening portion (53) is provided at the inner ring of the positioning ring (5), and a secondary opening operation is performed on the support hole through the opening portion (53).

2. The foundation pit support structure based on the old basement outer wall structure according to claim 1 is characterized by: The hole opening portion (53) comprises an inner circular guide rail (531) fixed centrally on the inner wall of the positioning ring (5); a displacement block (532) is slidably mounted inside the inner circular guide rail (531); rotating heads (533) are rotatably mounted at both ends of the displacement block (532); a hole opening cutter head (534) is fixedly mounted at the end of the rotating head (533); the hole opening cutter head (534) is welded from two L-shaped arc blades; a guide groove (535) is opened at the bottom center of the inner wall of the inner circular guide rail (531); the guide groove (535) is composed of a linear groove and an arc groove; a limiting protrusion (536) is mounted on the outer wall of the rotating head (533); and the limiting protrusion (536) is fixedly mounted on the outer wall of the rotating head (533). 36) is located in the guide groove (535), a swing arm (537) is hingedly connected to the outer wall of the displacement block (532) on the side of the opening of the inner circular guide rail (531), the end of the swing arm (537) is connected to the limited position toothed disc (538) through a round rod, a positioning toothed disc (521) is fixedly installed on the outer wall of the positioning plate (51) in the middle, the positioning toothed disc (521) and the limited position toothed disc (538) are connected by a chain (523), the end of the auxiliary rod (52) passes through the positioning toothed disc (521), and a driving arm (522) is installed at one end of the auxiliary rod (52) passing through the positioning toothed disc (521), and one end of the driving arm (522) is sleeved on the outer wall of the round rod.

3. The foundation pit support structure based on the old basement outer wall structure according to claim 2 is characterized by: A mounting hole (501) is provided at the center of the inner wall of the displacement block (532); a placement groove (502) is provided at the center of the inner wall of the inner circular guide rail (531); a guide rod (503) is installed transversely at the center of the placement groove (502); the guide rod (503) is welded from a straight rod and a wavy rod; a sliding sleeve (504) is sleeved on the outer wall of the guide rod (503); a connecting rod (505) is welded to the outer wall of the sliding sleeve (504); an end of the connecting rod (505) passes through the mounting hole (501) and is located at the center of the inner circular guide rail (531); a shift plate (506) is fixedly connected to the end of the connecting rod (505); and both ends of the shift plate (506) extend to the center of the two hole-opening cutter heads (534).

4. The foundation pit support structure based on the old basement outer wall structure according to claim 3 is characterized by: Leakage grooves (507) are provided at lower positions at both ends of the inner circular guide rail (531), and the leakage grooves (507) are directly opposite to the wavy rod area of ​​the guide rod (503). A tray (508) is provided directly below the leakage groove (507), and the side wall of the tray (508) is connected to the inner wall of the positioning ring (5) via a fixing rod.

5. The foundation pit support structure based on the old basement outer wall structure according to claim 3 is characterized by: A baffle plate (509) is installed on the inner wall of the rotating head (533), and a square hole is provided at the connection between the baffle plate (509) and the shifting plate (506).

6. The foundation pit support structure based on the old basement outer wall structure according to claim 2 is characterized by: A ball is installed at the connection between the displacement block (532) and the rotating head (533), and the outer surface of the ball is coated with lubricating grease.

7. The foundation pit support structure based on the old basement outer wall structure according to claim 1 is characterized by: The outer surface of the auxiliary rod (52) is a frosted surface, and a hexagonal groove is provided at the end of the auxiliary rod (52).

8. The foundation pit support structure based on the old basement outer wall structure according to claim 2 is characterized by: The limiting protrusion (536) is connected to the rotating head (533) via a threaded connection, and the limiting protrusion (536) is a high-strength metal structure with a smooth outer wall.

Images