Geotechnical engineering deep foundation pit support beam structure and its use method

Abstract

The present invention discloses a support beam frame structure and a use method for a deep foundation pit of a geotechnical engineering project, and belongs to the technical field of construction engineering. The support beam frame structure for a deep foundation pit of a geotechnical engineering project includes a connector, a support frame purlin, a receiving slot is provided on a pressure block, a second rotating shaft and a third rotating shaft are fixedly connected in the receiving slot, a tripod is rotatably connected to the second rotating shaft, a positioning cylinder is rotatably connected to the third rotating shaft, the tripod is rotatably connected to the positioning cylinder through a second connecting rod, a reinforcing rod is rotatably connected in the positioning cylinder, one end of the reinforcing rod is fixedly connected to a triangular plate, the other end of the reinforcing rod is rotatably connected to a conversion seat, the tripod is rotatably connected to the conversion seat through a first connecting rod, and a driving part for driving the tripod to rotate is provided in the receiving slot; the present invention greatly reduces the number of steel support beams used, reduces the lifting frequency, improves safety and facilitates transportation through an expandable and retractable steel support beam.

Description

Technical Field

[0001] The invention relates to the technical field of construction engineering, and in particular to a supporting beam frame structure for a deep foundation pit in a geotechnical engineering project and a use method thereof. Background Art

[0002] Deep foundation pit refers to a project with an excavation depth of more than 5 meters or a depth of less than 5 meters, but the geological conditions, surrounding environment and underground pipelines are particularly complex. The foundation pit project mainly includes the design and construction of the foundation pit support system and earthwork excavation, and is a highly comprehensive system project. It requires close cooperation between geotechnical engineering and structural engineering technicians. The foundation pit support system is a temporary structure and is no longer needed after the underground project construction is completed. Both the foundation pit and the foundation trench are used to build the foundation of a building, but they have different plane shapes. The foundation pit is square or close to a square, and the foundation trench is long and sometimes long. The foundation pit refers to a foundation pit with a bottom area of ​​less than 27 square meters and a bottom long side less than three times the short side. In other words, the general definition of a deep foundation pit is: a bottom area of ​​less than 27 square meters, and a bottom long side less than three times the short side, an excavation depth of more than 5 meters or more than three basement floors, or a depth of less than 5 meters, but the geological conditions, surrounding environment and underground pipelines are particularly complex.

[0003] In the prior art, when supporting the foundation pit, assembled steel support beams are mostly used. Since the steel support beams need to be evenly spaced during support and the foundation pit is deep, the assembly and dismantling before and after the support require frequent lifting with large cranes, which not only increases the workload but also greatly reduces the safety. At the same time, during the transportation process, the convenience of use is greatly reduced due to the large number of components that need to be transported. Summary of the invention

[0004] The purpose of the present invention is to solve the defects in the prior art that steel support beams need to be frequently lifted and assembled, resulting in reduced safety and poor transportation convenience, and to propose a geotechnical engineering deep foundation pit support beam frame structure and a use method.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A supporting beam frame structure for a deep foundation pit of a geotechnical engineering project comprises a connecting head and a supporting frame purlin. One end of the connecting head is detachably connected to the supporting frame, and the other end of the connecting head is connected to a pressure block, which abuts against the purlin. A receiving groove is provided on the pressure block, and a second rotating shaft and a third rotating shaft are fixedly connected in the receiving groove. A tripod is rotatably connected to the second rotating shaft, and a positioning cylinder is rotatably connected to the third rotating shaft. The tripod is rotatably connected to the positioning cylinder via a second connecting rod, and a reinforcing rod is rotatably connected in the positioning cylinder. One end of the reinforcing rod is fixedly connected to a triangular plate, and the other end of the reinforcing rod is rotatably connected to a conversion seat. The tripod is rotatably connected to the conversion seat via a first connecting rod, and a driving unit for driving the tripod to rotate is provided in the receiving groove.

[0007] Preferably, a fourth rotating shaft and a fifth rotating shaft are fixedly connected to the tripod, the second connecting rod is rotatably connected to the fourth rotating shaft, and the first connecting rod is rotatably connected to the fifth rotating shaft.

[0008] Preferably, the driving part comprises a hydraulic cylinder, a first rotating shaft is fixedly connected in the receiving groove, one end of the hydraulic cylinder is rotatably connected to the first rotating shaft, and the other end of the hydraulic cylinder is rotatably connected to a fourth rotating shaft.

[0009] Preferably, the positioning tube shell is fixedly connected to a positioning seat, and one end of the second connecting rod away from the tripod is rotatably connected to the positioning seat.

[0010] Preferably, an expansion plate is rotatably connected to the positioning cylinder, and one end of the expansion plate away from the positioning cylinder is rotatably connected to a third rotating shaft.

[0011] Preferably, there are two sets of the triangular plates, and the two sets of the triangular plates are symmetrically arranged on both sides of the pressure block.

[0012] Preferably, an expansion frame is fixedly connected to the connecting head, the pressure block is fixedly connected to an end of the expansion frame away from the connecting head, and a wedge groove is provided on the expansion frame.

[0013] Preferably, the connecting head and the supporting frame are fixedly connected with matching flanges.

[0014] Preferably, a bracket is fixedly connected to the enclosure purlin, and a connecting seat is fixedly connected to the top of the enclosure purlin.

[0015] A method for using a supporting beam frame structure for a deep foundation pit in geotechnical engineering, comprising the following steps: S1: fixing steel brackets and positioning plates on both side walls of the foundation pit;

[0016] S2: Fix the purlin on the steel corbel, and fill the purlin and the side wall of the foundation pit with concrete to ensure close contact; S3: Connect the connection seat to the positioning plate through the anti-fall rope;

[0017] S4: Connect the connector to one end of the support frame, and connect multiple groups of support frames in pairs according to the length of the foundation pit; S5: Lift the assembled support frame into the foundation pit, and place the pressure block on the bracket;

[0018] S6: Start the hydraulic cylinder to unfold the triangle plate and make the opposite sides of the triangle plates on the two adjacent sides fit together to form an additional support frame;

[0019] S7: Place the external hydraulic device on the expansion frame, apply prestress to the connector and the pressure block, and hammer the wedge block into the wedge groove;

[0020] S8: Hammer the wedges regularly to check if they are loose to prevent prestress failure; S9: After construction is completed, remove the wedges, support frames and purlins in turn.

[0021] Compared with the prior art, the present invention provides a support beam structure and a use method for a deep foundation pit in geotechnical engineering, which has the following beneficial effects:

[0022] 1. The supporting beam frame structure of the deep foundation pit of the geotechnical engineering, after the support frame is placed, the triangle plate is unfolded, and the connection between the long side of the triangle frame and the second connecting rod forms a dead point, which effectively ensures the unfolding stability of the triangle plate, and in the process of unfolding the triangle plate, the triangle plate is unfolded horizontally, and after the triangle plate is fully unfolded, the right-angle side of the triangle frame and the first connecting rod become a straight line, and form a dead point, to prevent the triangle plate from tilting, enhance the fit of the triangle plate to the surrounding purlin and the uniformity of force, so that when forming a large triangle with another set of triangle plates, it can replace a set of support frames, greatly reducing the cost of building use, reducing the frequency of lifting, and improving construction safety. In addition, during transportation, the triangle plate can be fitted on the outer wall of the connecting head, will not take up too much space, and is easy to transport and transfer.

[0023] 2. The supporting beam structure of the deep foundation pit of the geotechnical engineering project applies prestress to the purlin by expanding the pressure block with hydraulic equipment after the overall assembly of the steel support, so as to ensure the fit between the purlin and the side wall of the foundation pit, and after applying the predetermined prestress, insert the wedge block into the wedge groove to keep the prestress constant, and then remove the hydraulic equipment, which is convenient and easy to operate.

[0024] The parts not involved in the device are the same as the existing technology or can be implemented by the existing technology. After the hydraulic cylinder of the present invention fully unfolds the tripod, it is not necessary to maintain pressure all the time due to the existence of the dead point, thereby reducing the frequency of use of the external pressure supply equipment and increasing the service life of the pressure supply equipment. The anti-fall rope uses an adjustable length anti-fall rope with screw hooks threaded at both ends, thereby reducing the construction difficulty and improving construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The structural diagram of the support beam structure for the deep foundation pit of geotechnical engineering proposed by the present invention is as follows: Figure 1 ;

[0026] Figure 2 The present invention proposes a geotechnical engineering deep foundation pit support beam frame structure Figure 1 The structural diagram of part A in the figure;

[0027] Figure 3 This is a structural schematic diagram of a geotechnical engineering deep foundation pit support beam structure connector proposed by the present invention;

[0028] Figure 4 The structural diagram of the support beam structure for the deep foundation pit of geotechnical engineering proposed by the present invention is as follows: Figure 2 .

[0029] In the figure: 1. Connector; 101. Flange; 102. Expansion frame; 1021. Wedge groove; 2. Pressure block; 201. Storage groove; 202. First rotating shaft; 203. Hydraulic cylinder; 204. Second rotating shaft; 205. Tripod; 2051. Fourth rotating shaft; 2052. Fifth rotating shaft; 206. Third rotating shaft; 207. Extension plate; 208. Second connecting rod; 209. First connecting rod; 3. Positioning cylinder; 301. Positioning seat; 302. Reinforcing rod; 303. Conversion seat; 304. Triangle plate; 4. Support frame; 5. Purlin; 501. Bracket; 502. Connecting seat; 6. Anti-fall rope; 601. Positioning plate; 7. Steel corbel. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely 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.

[0031] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0032] Example:

[0033] Reference Figure 1-3The supporting beam structure of a deep foundation pit of a geotechnical engineering project comprises a connector 1, a support frame 4 and a purlin 5. One end of the connector 1 is detachably connected to the support frame 4, and the other end of the connector 1 is connected to a pressure block 2, which is against the purlin 5. A receiving groove 201 is provided on the pressure block 2, and a second rotating shaft 204 and a third rotating shaft 206 are fixedly connected in the receiving groove 201. A tripod 205 is rotatably connected to the second rotating shaft 204, and a positioning cylinder 3 is rotatably connected to the third rotating shaft 206. The tripod 205 is rotatably connected to the positioning cylinder 3 through a second connecting rod 208, and a reinforcing rod 302 is rotatably connected in the positioning cylinder 3. One end of the reinforcing rod 302 is fixedly connected to a triangular plate 304, and the other end of the reinforcing rod 302 is rotatably connected to a conversion seat 303. The tripod 205 is rotatably connected to the conversion seat 303 through a first connecting rod 209, and a driving unit for driving the tripod 205 to rotate is provided in the receiving groove 201.

[0034] The fourth rotating shaft 2051 and the fifth rotating shaft 2052 are fixedly connected to the tripod 205, the second connecting rod 208 is rotatably connected to the fourth rotating shaft 2051, the first connecting rod 209 is rotatably connected to the fifth rotating shaft 2052, the driving part includes a hydraulic cylinder 203, the first rotating shaft 202 is fixedly connected in the storage groove 201, one end of the hydraulic cylinder 203 is rotatably connected to the first rotating shaft 202, and the other end of the hydraulic cylinder 203 is rotatably connected to the fourth rotating shaft 2051, the outer shell of the positioning tube 3 is fixedly connected to the positioning seat 301, the end of the second connecting rod 208 away from the tripod 205 is rotatably connected to the positioning seat 301, the positioning tube 3 is rotatably connected with an expansion plate 207, and the end of the expansion plate 207 away from the positioning tube 3 is rotatably connected to the third rotating shaft 206, the number of the triangular plates 304 is two groups, and the two groups of triangular plates 304 are symmetrically arranged on both sides of the pressure block 2.

[0035] After the support frame 4 is placed, the triangle plate 304 is unfolded. Specifically, the driving unit is used to drive the acute angle end of the tripod 205 to rotate around the second rotating shaft 204, and the long side of the tripod 205 pushes the positioning cylinder 3 out of the storage slot 201 through the second connecting rod 208, until the long side of the tripod 205 and the second connecting rod 208 become a straight line to fully unfold the positioning cylinder 3. At this time, the connection between the long side of the tripod 205 and the second connecting rod 208 forms a dead point, which effectively ensures the unfolding stability of the triangle plate 304, and in the process of unfolding the tripod 205, the right-angled side of the tripod 205 will push the reinforcing rod 3 through the first connecting rod 209. 02 rotates in the positioning cylinder 3, so that the triangular plate 304 is horizontally unfolded, and after the triangular plate 304 is fully unfolded, the right-angled side of the tripod 205 and the first connecting rod 209 become a straight line, and form a dead point, preventing the triangular plate 304 from tilting, enhancing the fit and force uniformity of the triangular plate 304 to the purlin 5, so that when forming a large triangle with another set of triangular plates 304, it can replace a set of support frames 4, greatly reducing the cost of building use, reducing the frequency of lifting, and improving construction safety. In addition, during transportation, the triangular plate 304 can be attached to the outer wall of the connecting head 1 without taking up too much space, which is convenient for transportation and transfer.

[0036] Reference Figure 1 and Figure 4 An expansion frame 102 is fixedly connected to the connecting head 1, a pressure block 2 is fixedly connected to the end of the expansion frame 102 away from the connecting head 1, a wedge groove 1021 is provided on the expansion frame 102, the connecting head 1 and the support frame 4 are fixedly connected with mutually matching flanges 101, a bracket 501 is fixedly connected to the purlin 5, and a connecting seat 502 is fixedly connected to the top of the purlin 5.

[0037] After the overall assembly of the steel support is completed, the hydraulic equipment is used to expand the pressure block 2 to apply prestress to the purlin 5 to ensure the fit between the purlin 5 and the side wall of the foundation pit, and after applying the predetermined prestress, the wedge block is inserted into the wedge groove 1021 to keep the prestress constant, and the hydraulic equipment can be removed. It is convenient, fast and easy to operate.

[0038] Reference Figure 1-4 :

[0039] A method for using a supporting beam frame structure for a deep foundation pit in geotechnical engineering, comprising the following steps: S1: fixing steel brackets 7 and positioning plates 601 on both side walls of the foundation pit;

[0040] S2: fix the purlin 5 on the steel corbel 7, and fill the purlin 5 and the side wall of the foundation pit with concrete to ensure close contact; S3: connect the connecting seat 502 to the positioning plate 601 through the anti-fall rope 6;

[0041] S4: Connect the connector 1 to one end of the support frame 4, and connect multiple groups of support frames 4 in pairs according to the length of the foundation pit; S5: Lift the assembled support frame 4 into the foundation pit, and place the pressure block 2 on the bracket 501;

[0042] S6: Start the hydraulic cylinder 203 to unfold the triangular plate 304 and make the opposite sides of the triangular plates 304 on two adjacent sides fit together to form an additional support frame 4;

[0043] S7: placing the external hydraulic device on the expansion frame 102, applying prestress to the connector 1 and the pressure block 2, and hammering the wedge block into the wedge groove 1021;

[0044] S8: Hammer the wedges regularly to check if they are loose to prevent prestress failure; S9: After the construction is completed, remove the wedges, support frame 4 and purlin 5 in turn.

[0045] In the present invention, after the hydraulic cylinder 203 fully unfolds the tripod 205, due to the existence of the dead point, it is not necessary to maintain pressure all the time, thereby reducing the frequency of use of the external pressure supply equipment and increasing the service life of the pressure supply equipment. The anti-fall rope 6 uses an adjustable length anti-fall rope 6 with screw hooks threaded at both ends, thereby reducing the construction difficulty and improving the construction efficiency.

[0046] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A support beam frame structure for a deep foundation pit in geotechnical engineering, comprising a connector (1), a support frame (4) and a purlin (5), wherein one end of the connector (1) is detachably connected to the support frame (4), and the other end of the connector (1) is connected to a pressure block (2), wherein the pressure block (2) abuts against the purlin (5), and wherein the connector (1) is provided with a pressure block (2). The pressure block (2) is provided with a receiving groove (201), a second rotating shaft (204) and a third rotating shaft (206) are fixedly connected in the receiving groove (201), a tripod (205) is rotatably connected to the second rotating shaft (204), a positioning cylinder (3) is rotatably connected to the third rotating shaft (206), the tripod (205) is rotatably connected to the positioning cylinder (3) via a second connecting rod (208), a reinforcing rod (302) is rotatably connected in the positioning cylinder (3), one end of the reinforcing rod (302) is fixedly connected to the third rotating shaft (206), and the tripod (205) is rotatably connected to the positioning cylinder (3) via a second connecting rod (208). The corner plate (304) is provided, the other end of the reinforcing rod (302) is rotatably connected to a conversion seat (303), the tripod (205) is rotatably connected to the conversion seat (303) via a first connecting rod (209), a driving unit for driving the tripod (205) to rotate is provided in the storage slot (201); a fourth rotating shaft (2051) and a fifth rotating shaft (2052) are fixedly connected to the tripod (205), the second connecting rod (208) is rotatably connected to the fourth rotating shaft (2051), and the first connecting rod (209) is rotatably connected to the fourth rotating shaft (2051). The driving part comprises a hydraulic cylinder (203), a first rotating shaft (202) is fixedly connected in the storage groove (201), one end of the hydraulic cylinder (203) is rotatably connected to the first rotating shaft (202), and the other end of the hydraulic cylinder (203) is rotatably connected to the fourth rotating shaft (2051); the outer shell of the positioning cylinder (3) is fixedly connected to a positioning seat (301), and one end of the second connecting rod (208) away from the tripod (205) is rotatably connected to the positioning seat (301); An expansion plate (207) is rotatably connected to the positioning cylinder (3), and one end of the expansion plate (207) away from the positioning cylinder (3) is rotatably connected to the third rotating shaft (206); the number of the triangular plates (304) is two groups, and the two groups of triangular plates (304) are symmetrically arranged on both sides of the pressure block (2); the connecting head (1) is fixedly connected to an expansion frame (102), and the pressure block (2) is fixedly connected to one end of the expansion frame (102) away from the connecting head (1), and a wedge groove (1021) is provided on the expansion frame (102).

2. The geotechnical engineering deep foundation pit support beam structure according to claim 1, characterized in that: The connecting head (1) and the supporting frame (4) are both fixedly connected with flanges (101) that fit together.

3. The geotechnical engineering deep foundation pit support beam structure according to claim 1, characterized in that: A bracket (501) is fixedly connected to the purlin (5), and a connecting seat (502) is fixedly connected to the top of the purlin (5).

4. A method for using the geotechnical engineering deep foundation pit support beam frame structure according to claim 1, characterized in that: The steps include: S1: Fix steel brackets (7) and positioning plates (601) on both sides of the foundation pit; S2: Fix the purlin (5) on the steel corbel (7), and fill the purlin (5) and the side wall of the foundation pit with concrete to ensure close contact; S3: Connect the connecting seat (502) to the positioning plate (601) via the anti-fall rope (6); S4: Connect the connector (1) to one end of the support frame (4), and connect multiple groups of support frames (4) in pairs according to the length of the foundation pit; S5: hoisting the assembled support frame (4) into the foundation pit, and placing the pressure block (2) on the bracket (501); S6: activating the hydraulic cylinder (203) to unfold the triangular plate (304) and to make the opposite sides of the triangular plates (304) on two adjacent sides fit together to form an additional support frame (4); S7: placing the external hydraulic equipment on the expansion frame (102), applying prestress to the connector (1) and the pressure block (2), and hammering the wedge block into the wedge groove (1021); S8: Hammer the wedges regularly to check if they are loose to prevent prestress failure; S9: After the construction is completed, the wedges, support frame (4) and purlin (5) are removed in sequence.

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