Pump station special-shaped foundation pit supporting method

Abstract

The application provides a pump station special-shaped foundation pit supporting method, which is used for constructing a special-shaped pump station foundation pit in a silt ground beside a river, and the interior of a steel sheet pile is effectively supported by installing a one-way support frame, a two-way support frame and a lengthened support frame on a support pile in the foundation pit, and the support pressure of each point is adjusted in real time according to the pressure parameters returned by each oil cylinder, so that the collapse of the steel sheet pile caused by the overlarge or too small pressure in the steel sheet pile is prevented, and the safety of construction is improved. The method solves the problems that the steel sheet pile is deformed inward and the internal and external pressure of the steel sheet pile is uneven when the special-shaped foundation pit is constructed under the silt geological conditions beside the river.

Description

Technical Field

[0001] This invention relates to the field of pump station foundation pit construction, and in particular to a method for supporting irregularly shaped pump station foundation pits. Background Technology

[0002] Foundation pit support refers to the measures taken to support, reinforce, and protect the sidewalls and surrounding environment of a foundation pit to ensure the safety of underground structure construction and the surrounding environment. A foundation pit support structure system generally includes two parts: a retaining structure and a dewatering and waterproofing system. Pile and wall-type support structures commonly use steel sheet piles, tie-rod concrete sheet piles, column-type cast-in-place piles, and diaphragm walls. Depending on soil conditions and the size of the foundation pit, it can be designed as a cantilever type, an internally braced type, or an anchored type. Gravity support structures often use cement-soil mixing pile retaining walls, soil nailing walls, etc.

[0003] In silty geological conditions along riverbanks, existing foundation pit protection structures are unreliable. Sheet piles are subject to pressure from the silt, causing them to deform inwards, posing a risk of pit collapse and resulting in low safety. Furthermore, due to this inward deformation, the sheet piles need to be designed with greater strength, leading to increased weight and construction costs. Therefore, a construction method and device are needed to effectively support the sheet piles internally using existing support piles within the foundation pit. Summary of the Invention

[0004] The main objective of this invention is to provide a method for supporting irregularly shaped foundation pits in pumping stations, which solves the problem that when constructing irregularly shaped foundation pits in silty geological conditions along river channels, the sheet piles are subjected to pressure from the silt, causing the sheet piles to deform inward and resulting in uneven internal and external pressure on the sheet piles.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a method for supporting irregularly shaped foundation pits in pumping stations, the method comprising: S1. Construct a cofferdam to block water from the river, use a water pump to drain the water inside the cofferdam, and wait for the riverbed to dry and be dredged. S2. Install steel sheet piles and support piles according to the location of the defense line; S3. Excavate the foundation pit and install the waler support around the inner perimeter of the steel sheet piles according to the design elevation. S4. Install steel walers on the waler support frame, and install one-way supports, two-way supports and extended supports on the support piles according to the corresponding positions; S5. Repeat steps S3-S4 until the depth of the foundation pit reaches the design standard.

[0006] In the preferred embodiment, tensioning holes are provided on the steel waler; All unidirectional, bidirectional, and extended support frames are equipped with a circumferential assembly. The unidirectional support includes a circumferential assembly, which has multiple second crossbeams, multiple second longitudinal beams between the second crossbeams, and a top plate assembly at one end of each second crossbeam. The top plate assembly and the second crossbeam are also provided with multiple guide shafts, and the guide shafts are provided with sliding slide plates. A first hydraulic cylinder is provided between the slide plates and the second longitudinal beam.

[0007] In the preferred embodiment, the bidirectional support includes a circumferential assembly, a plurality of first crossbeams are provided above the circumferential assembly, a plurality of first longitudinal beams are provided between the first crossbeams, and top plate assemblies are symmetrically provided at both ends of the second crossbeams. The top plate assembly and the second crossbeam are also provided with multiple guide shafts, and the guide shafts are provided with sliding slide plates. A first hydraulic cylinder is provided between the slide plates and the second longitudinal beam.

[0008] In the preferred embodiment, the extended support frame includes a two-way support frame, with top plate assemblies symmetrically provided at both ends of the two-way support frame; An extension support is provided between the top plate assembly and the bidirectional support frame. The extension support frame includes a circumferential assembly, which is provided with multiple guide frames. A slidable third crossbeam is provided in the guide frame, and a third longitudinal beam is provided between the third crossbeams. A connecting piece is provided between the third longitudinal beam and the slide plate. The top plate assembly is installed on the third longitudinal beam.

[0009] In the preferred embodiment, a flip-up top cover is provided above the guide frame, and multiple roller frames are provided at the bottom of the guide frame and below the top cover. Rollers are provided on the roller frames, and multiple side balls are provided on both sides inside the guide frame to assist the sliding of the third crossbeam.

[0010] In the preferred embodiment, the circumferential assembly includes a semi-circular circumferential cylinder, with locking plates symmetrically arranged on both sides of the circumferential cylinder, a circumferential plate above the circumferential cylinder, a circumferential plate above the circumferential plate, and multiple tension plates on the circumferential plate. The circumferential surface of the circumferential tube is provided with multiple pile holes for connecting with the support piles. The circumferential plate is also provided with a semi-circular opening on the side near the circumferential tube.

[0011] In the preferred embodiment, the locking plate is provided with a through locking pin, and a diagonal brace is provided between the locking pin and the lower part of the circumferential plate. A support pad is also provided between the diagonal brace and the circumferential plate.

[0012] In the preferred embodiment, the top plate assembly includes a top plate, and one side of the top plate is provided with a first lug and a second lug, and the first lug is provided with an elongated hole; The first lug is connected to the second hydraulic cylinder, and the second lug is connected to the third hydraulic cylinder. The second and third hydraulic cylinders are used to adjust the tilt angle of the top plate.

[0013] In the preferred embodiment, the top plate is also provided with a locking hole, and a locking sleeve that can rotate 90 degrees is coaxially provided in the locking hole. The locking sleeve penetrates the top plate; The locking sleeve has a rotatable locking rod at its shaft center. The locking rod passes through the locking sleeve and is threadedly engaged with the locking sleeve. The shaft end of the locking rod has a rotatable tensioning element, and the shaft end of the locking sleeve has a groove. The tensioning element is arranged between the grooves.

[0014] In the preferred embodiment, the side of the tensioner near the top plate is provided with ratchet teeth, and the side of the top plate facing the tensioner is also provided with ratchet teeth.

[0015] This invention provides a method for supporting irregularly shaped foundation pits in pumping stations, which has the following beneficial effects: 1. This method allows for the construction of irregularly shaped pump station foundation pits in silty soil beside river channels. By installing unidirectional, bidirectional, and extended supports on the support piles within the foundation pit, the internal structure of the sheet piles can be effectively supported. The internal support pressure at each point can be adjusted in real time through the pressure parameters transmitted from each hydraulic cylinder, preventing pit collapse caused by excessive or insufficient pressure inside the sheet piles, thus improving construction safety.

[0016] 2. The top plate assembly in this method allows for adjustment of the tilt angle of the top plate in front, enabling different angle adjustments for different tilt angles of the sheet piles in irregularly shaped foundation pits. This allows the top plate to fit more closely to the steel waler, and the top plate surface and the tilted steel waler form a surface-to-surface contact, resulting in more uniform force distribution and improved effective support force of the hydraulic cylinder for the sheet piles. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the construction of the irregular-shaped foundation pit for the pump station according to the present invention; Figure 2 This is a schematic diagram of the installation of the support device of the present invention; Figure 3 This is a schematic diagram of the installation of the support device of the present invention from another direction; Figure 4 This is a schematic diagram of the construction of the irregular foundation pit of the pumping station according to the present invention; Figure 5 This is a schematic diagram of the pouring construction of the irregular foundation pit of the pump station of the present invention from another direction; Figure 6 This is a panoramic view of the completed pump station construction according to the present invention; Figure 7 This is an axonometric view of the bidirectional support frame of the present invention; Figure 8 This is an axonometric view of the bidirectional support frame of the present invention from another direction; Figure 9 This is an axonometric view of the extended support frame of the present invention; Figure 10 This is an axonometric view of the extended support frame of the present invention from another direction; Figure 11 This is a cross-sectional view of the guide frame of the present invention; Figure 12 This is a top view of the unidirectional support frame of the present invention; Figure 13 This is an isometric view of the circumferential assembly of the present invention; Figure 14 This is a schematic diagram of the installation of the steel waler of the present invention; Figure 15 This is a cross-sectional view of the steel waler of the present invention; Figure 16 This is an isometric view of the top plate assembly of the present invention.

[0018] In the diagram: 1. Pump station foundation pit; 2. Support pile; 3. Steel waler; 301. Tensioning hole; 4. Two-way support frame; 401. First crossbeam; 402. First longitudinal beam; 403. Guide shaft; 404. First hydraulic cylinder; 405. Slide plate; 5. One-way support frame; 501. Second crossbeam; 502. Second longitudinal beam; 6. Extension support frame; 601. Guide frame; 602. Third crossbeam; 603. Connector; 604. Top cover; 605. Roller frame; 606. Roller; 607. Side ball bearings; 608. Steel sheet pile; 7. Sealing template; 8. Inlet pit; 9. Retaining wall; 10. Ground layer; 11. Drainage ditch; 12. Water channel layer; 13. Pump base. 5; Inlet; 16; Encircling assembly; 17; Encircling cylinder; 1701; Encircling plate; 1702; Pile hole; 1703; Locking plate; 1704; Encircling flat plate; 1705; Support pad; 1706; Diagonal brace; 1707; Locking pin; 1708; Tensioning plate; 1709; Semi-circular opening; 1710; Top plate assembly; 18; Second hydraulic cylinder; 1801; Third hydraulic cylinder; 1802; First support lug; 1803; Top plate; 1804; Second support lug; 1805; Long hole; 1806; Locking hole; 1807; Tensioning piece; 1808; Locking sleeve; 1809; Locking rod; 1810; Slot; 1811; Waler bracket; 19. Detailed Implementation

[0019] Example 1 like Figure 1-16 As shown, a method for supporting irregularly shaped foundation pits in pumping stations includes: S1. Construct a cofferdam to block water from the river, use a water pump to drain the water inside the cofferdam, and wait for the riverbed to dry and be dredged. S2. Install steel sheet piles 7 and support piles 2 according to the position of the defense line; S3. Excavate the foundation pit and install the waler support 19 on the inner perimeter of the steel sheet pile 7 according to the design elevation. S4. Install steel walers 3 on waler bracket 19, and install one-way support 5, two-way support 4 and extended support on support pile 2 according to the corresponding positions. S5. Repeat steps S3-S4 until the depth of the foundation pit reaches the design standard.

[0020] In the preferred embodiment, the steel waler 3 is provided with tensioning holes 301; The unidirectional support 5, the bidirectional support 4, and the extended support are all equipped with a circumferential assembly 17; The unidirectional support 5 includes a circumferential assembly 17, a plurality of second crossbeams 501 are provided on the circumferential assembly 17, a plurality of second longitudinal beams 502 are provided between the second crossbeams 501, and a top plate assembly 18 is provided at one end of the second crossbeams 501. The top plate assembly 18 and the second crossbeam 501 are also provided with multiple guide shafts 403, and a sliding plate 405 is provided on the guide shaft 403. A first hydraulic cylinder 404 is provided between the sliding plate 405 and the second longitudinal beam 502.

[0021] In the preferred embodiment, the bidirectional support frame 4 includes a circumferential assembly 17, with multiple first crossbeams 401 above the circumferential assembly 17, multiple first longitudinal beams 402 between the first crossbeams 401, and top plate assemblies 18 symmetrically arranged at both ends of the second crossbeam 501. The top plate assembly 18 and the second crossbeam 501 are also provided with multiple guide shafts 403, and a sliding plate 405 is provided on the guide shaft 403. A first hydraulic cylinder 404 is provided between the sliding plate 405 and the second longitudinal beam 502.

[0022] In the preferred embodiment, the extended support frame includes a two-way support frame 4, and top plate assemblies 18 are symmetrically provided at both ends of the two-way support frame 4; An extension support 6 is also provided between the top plate assembly 18 and the bidirectional support 4. The extension support 6 includes a circumferential assembly 17. Multiple guide frames 601 are provided on the circumferential assembly 17. A slidable third crossbeam 602 is provided in the guide frame 601. A third longitudinal beam 603 is provided between the third crossbeams 602. A connecting piece 604 is provided between the third longitudinal beam 603 and the slide plate 405. The top plate assembly 18 is installed on the third longitudinal beam 603.

[0023] In the preferred embodiment, a flip-up top cover 605 is provided above the guide frame 601, and multiple roller frames 606 are provided at the bottom of the guide frame 601 and below the top cover 605. Rollers 607 are provided on the roller frames 606, and multiple side balls 608 are provided on both sides inside the guide frame 601. The side balls 608 are used to assist the sliding of the third crossbeam 602.

[0024] In the preferred embodiment, the circumferential assembly 17 includes a semi-circular circumferential cylinder 1701, with locking plates 1704 symmetrically arranged on both sides of the circumferential cylinder 1701, a circumferential plate 1702 arranged above the circumferential cylinder 1701, a circumferential flat plate 1705 arranged above the circumferential plate 1702, and a plurality of tensioning plates 1709 arranged on the circumferential flat plate 1705. The circumferential surface of the circumferential cylinder 1701 is provided with multiple pile holes 1703, which are used to connect with the support pile 2. The circumferential plate 1705 is also provided with a semi-circular opening 1710 on the side near the circumferential cylinder 1701.

[0025] In the preferred embodiment, the locking plate 1704 is provided with a through locking pin 1708, and a diagonal brace 1707 is provided between the locking pin 1708 and the lower part of the encircling plate 1705. A support pad 1706 is also provided between the diagonal brace 1707 and the encircling plate 1705.

[0026] In a preferred embodiment, the top plate assembly 18 includes a top plate 1804, and a first ear 1803 and a second ear 1805 are provided on one side of the top plate 1804. The first ear 1803 is provided with an elongated hole 1806. The first lug 1803 is connected to the second cylinder 1801, and the second lug 1805 is connected to the third cylinder 1802. The second cylinder 1801 and the third cylinder 1802 are used to adjust the tilt angle of the top plate 1804.

[0027] In the preferred embodiment, the top plate 1804 is also provided with a locking hole 1807, and a locking sleeve 1809 that can rotate 90 degrees is coaxially provided in the locking hole 1807. Locking sleeve 1809 penetrates top plate 1804; The locking sleeve 1809 has a rotatable locking rod 1810 at its shaft. The locking rod 1810 passes through the locking sleeve 1809 and is threadedly engaged with the locking sleeve 1809. The shaft end of the locking rod 1810 has a rotatable tensioning member 1808. The shaft end of the locking sleeve 1809 has a groove 1811, and the tensioning member 1808 is arranged between the grooves 1811.

[0028] In the preferred embodiment, the side of the tensioner 1808 near the top plate 1804 is provided with ratchet teeth, and the side of the top plate 1804 facing the tensioner 1808 is also provided with ratchet teeth. The construction process of a pump station irregular foundation pit support method is as follows: The construction is divided into four phases. The key construction is the pouring of the pump room section and the water inlet section, as well as the construction of the foundation pit. The foundation pits of the pump room section and the water inlet section are excavated at the same time and poured in sections.

[0029] S1. Construct a cofferdam with a retaining wall 10 along the river to block the water, and use a water pump to pump out the water inside the cofferdam while waiting for the riverbed to dry and be dredged. S2. Install steel sheet piles 7 and support piles 2 according to the position of the defense line. The support piles 2 can be mixing piles. The support piles 2 are distributed at the corresponding design points inside the foundation pit to facilitate the installation of subsequent support devices. S3. Excavate the foundation pit. First, excavate to a height that is convenient for manual installation of the waler support 19. Then, manually install the waler support 19 on the inner perimeter of the steel sheet pile 7 according to the design elevation. After the support is installed, re-lay out the line and measure the horizontal value to ensure that all the installed waler supports 19 are at the same elevation. S4. Install steel walers 3 on waler bracket 19, and then fix steel walers 3 to waler bracket 19 by passing screws through the bottom of waler bracket 19. Install one-way support 5, two-way support 4 and extended support on support pile 2 according to the corresponding positions of steel walers 3. In the pump station foundation pit 1, one side is connected to the steel waler 3 by three sets of unidirectional support frames 5. The middle of the pump station foundation pit 1 is connected to the steel waler 3 on both sides by four sets of extended support frames. At the narrowest point of the inlet foundation pit 9, a set of bidirectional support frames 4 is connected to the steel waler 3 on both sides. The middle of the inlet foundation pit 9 is connected to the steel waler 3 on both sides by two sets of extended support frames. The widest side of the inlet foundation pit 9 is connected to the steel waler 3 on one side by three sets of unidirectional support frames 5. By connecting the support frames to the steel waler 3, the pressure of the surrounding steel sheet piles 7 can be controlled by the pressure detector on the oil cylinder, while prestressing can be applied to the steel sheet piles 7. The installation method of the circumferential assembly 17 is as follows: First, the circumferential cylinder 1701 is hoisted to the elevation position according to the construction requirements and installed on the support pile 2. By inserting positioning pins into the pile holes 1703 around the circumferential cylinder 1701, the circumferential cylinder 1701 can be fixed on the support pile 2. Then, the locking pin 1708 is passed through the locking plate 1704 to further lock the circumferential cylinder 1701. Finally, the circumferential plate 1705 is installed on the circumferential plate 1702 and locked with bolts. A diagonal brace 1707 is provided between the bottom of the plate 1705 and the locking pin 1708. One end of the diagonal brace 1707 is sleeved with the locking pin 1708, and the other end is connected to the bottom of the plate 1705 by bolts. A support plate 1706 is also provided between the diagonal brace 1707 and the bottom of the plate 1705. The support plate 1706 can be inserted from one side into the diagonal brace 1707 and the bottom of the plate 1705, and is equipped with various specifications for leveling the plate 1705. The unidirectional support 5 has symmetrical second crossbeams 501 arranged on the encircling plate 1705 of the encircling assembly 17, and second longitudinal beams 502 arranged between the second crossbeams 501. A guide shaft 403 and a sliding plate 405 are installed at one end of the two second crossbeams 501. A first hydraulic cylinder 404 is provided between the sliding plate 405 and the second longitudinal beam 502. A top plate assembly 18 is arranged on the outside of the sliding plate 405. The bidirectional support frame 4 replaces the second crossbeam 501 with the first crossbeam 401 and the second longitudinal beam 502 with the first longitudinal beam 402 on the basis of the unidirectional support frame 5. Alternatively, a section of the crossbeam can be extended at one end of the original second crossbeam 501 to maintain symmetrical length on both sides, and then the top plate assembly 18 can be installed on the outward side of the second longitudinal beam 502. The extended support frame is based on the two-way support frame 4, with an extension support frame 6 added between the top plate assembly 18 and the second longitudinal beam 502, so that the entire support frame can achieve a longer support distance.

[0030] The top plate assembly 18 includes a second hydraulic cylinder 1801 and a third hydraulic cylinder 1802. The output shaft end of the second hydraulic cylinder 1801 is slidably engaged with the elongated hole 1806 on the first support lug 1803, and the output shaft end of the third hydraulic cylinder 1802 is rotatably engaged with the second support lug 1805. Under normal circumstances, extending or shortening the second hydraulic cylinder 1801 can adjust the tilt angle of the front top plate 1804. Adjusting the tilt angle can make the surface of the top plate 1804 fit more closely to the steel waler 3. After it fits closely to the steel waler 3, the locking sleeve 1809 is manually rotated to make the tensioning member 1808 engage with the tensioning hole 301 on the steel waler 3. Parallel, so that the tensioning member 1808 can pass through the tensioning hole 301. After the tensioning member 1808 passes through the tensioning hole 301, the locking sleeve 1809 is rotated 90 degrees in the opposite direction again, so that the tensioning member 1808 is perpendicular to the tensioning hole 301. Then the locking rod 1810 is rotated, so that the tensioning member 1808 gradually presses against the inner wall of the steel waler 3 in the slot 1811. After locking, the ratchet on the tensioning member 1808 and the ratchet on the top plate 1804 clamp the steel waler 3 from the inside and outside. Then the locking nut on the locking rod 1810 is rotated to fix the top plate 1804 to the steel waler 3. Onshore inspection personnel use the pressure parameters transmitted back from the first hydraulic cylinder 404, the second hydraulic cylinder 1801 and the third hydraulic cylinder 1802 to determine whether the supported position needs to be increased, so that the inward pressure of the entire sheet pile 7 is kept within a controllable range to prevent pit collapse. S5. Repeat steps S3-S4 until the depth of the foundation pit reaches the design standard. S6. As the foundation pit is gradually excavated downwards, multiple layers of one-way support 5, two-way support 4 and extended support are set up according to the design height. After the final design depth is reached, a short formwork is set up at the reserved position along the inner wall of the steel sheet pile 7 at the bottom, and the first foundation pouring is carried out to form the ground base 11. After the ground base 11 is formed, the overall risk of the foundation pit will be greatly reduced. S7. After the base course 11 has solidified and cured, the water channel layer 13 is poured on top of it using a support template. During pouring, the bottom one-way support 5, two-way support 4 and extended support need to be removed. After the water channel layer 13 has solidified and cured, a vertical sealing template 8 is laid at the narrow passage between the inlet section and the pump room section. This can be achieved by supporting the template on the side of the two-way support 4 facing the sealing template 8. S8. Next, pour the water channel in the pump room and the water pump base 15 above it. Finally, after the concrete on the pump room side has solidified and cured, pour the water inlet 16. The support pile 2 on one side of the water inlet 16 is broken according to the construction requirements. Finally, wait for the concrete on the side of the water inlet 16 to solidify and cure before completing the concrete pouring construction of the entire pump station. After the pump station maintenance is completed, the water pump motor is hoisted and then the water retaining wall 10 is removed, and the pump station is officially put into use.

[0031] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The scope of protection of the present invention should be limited to the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A method for supporting irregularly shaped foundation pits in pumping stations, characterized by: The method includes: S1. Construct a cofferdam to block water from the river, use a water pump to drain the water inside the cofferdam, and wait for the riverbed to dry and be dredged. S2. Install steel sheet piles (7) and support piles (2) according to the location of the defense line; S3. Excavate the foundation pit and install the waler support (19) on the inner perimeter of the steel sheet pile (7) according to the design elevation. S4. Install steel walers (3) on the waler support (19), and install one-way support (5), two-way support (4) and extended support on the support pile (2) according to the corresponding positions; S5. Repeat steps S3-S4 until the depth of the foundation pit reaches the design standard. The steel waler (3) is provided with tensioning holes (301); The unidirectional support (5), the bidirectional support (4) and the extended support are all equipped with a circumferential assembly (17). The unidirectional support (5) includes a circumferential assembly (17), a plurality of second crossbeams (501) are provided on the circumferential assembly (17), a plurality of second longitudinal beams (502) are provided between the second crossbeams (501), and a top plate assembly (18) is provided at one end of the second crossbeams (501). The top plate assembly (18) and the second crossbeam (501) are also provided with multiple guide shafts (403), and a sliding plate (405) is provided on the guide shaft (403). A first hydraulic cylinder (404) is provided between the sliding plate (405) and the second longitudinal beam (502). The circumferential assembly (17) includes a semi-circular circumferential cylinder (1701), with locking plates (1704) symmetrically arranged on both sides of the circumferential cylinder (1701), a circumferential plate (1702) above the circumferential cylinder (1701), a circumferential flat plate (1705) above the circumferential plate (1702), and multiple tension plates (1709) on the circumferential flat plate (1705). The circumferential surface of the circumferential tube (1701) is provided with multiple pile holes (1703), which are used to connect with the support pile (2). The circumferential plate (1705) is also provided with a semi-circular opening (1710) on the side near the circumferential tube (1701). A through locking pin (1708) is provided on the locking plate (1704), and a diagonal brace (1707) is provided between the locking pin (1708) and the lower part of the circumferential plate (1705). A support pad (1706) is also provided between the diagonal brace (1707) and the circumferential plate (1705). The top plate (1804) is also provided with a locking hole (1807), and a locking sleeve (1809) that can rotate 90 degrees is coaxially provided in the locking hole (1807). The locking sleeve (1809) penetrates the top plate (1804); The locking sleeve (1809) has a rotatable locking rod (1810) at its shaft center. The locking rod (1810) passes through the locking sleeve (1809) and is threadedly engaged with the locking sleeve (1809). The shaft end of the locking rod (1810) is provided with a rotatable tensioning member (1808). The shaft end of the locking sleeve (1809) is provided with a groove (1811), and the tensioning member (1808) is arranged between the grooves (1811).

2. The method for supporting irregularly shaped foundation pits of pumping stations according to claim 1, characterized in that: bidirectional... The support frame (4) includes a circumferential assembly (17), with multiple first crossbeams (401) above the circumferential assembly (17), multiple first longitudinal beams (402) between the first crossbeams (401), and top plate assemblies (18) symmetrically arranged at both ends of the second crossbeams (501). The top plate assembly (18) and the second crossbeam (501) are also provided with multiple guide shafts (403), and a sliding plate (405) is provided on the guide shaft (403). A first oil cylinder (404) is provided between the sliding plate (405) and the second longitudinal beam (502).

3. The method for supporting irregularly shaped foundation pits in pumping stations according to claim 1, characterized in that: The extended support frame includes a two-way support frame (4), and top plate assemblies (18) are symmetrically provided at both ends of the two-way support frame (4). An extension support (6) is also provided between the top plate assembly (18) and the two-way support (4). The extension support (6) includes a circumferential assembly (17). Multiple guide frames (601) are provided on the circumferential assembly (17). A slidable third crossbeam (602) is provided in the guide frame (601). A third longitudinal beam (603) is provided between the third crossbeams (602). A connector (604) is provided between the third longitudinal beam (603) and the slide plate (405). The top plate assembly (18) is installed on the third longitudinal beam (603).

4. The method for supporting irregularly shaped foundation pits in pumping stations according to claim 3, characterized in that: The guide frame (601) is provided with a flip-up top cover (605). Multiple roller frames (606) are provided at the bottom of the guide frame (601) and below the top cover (605). Rollers (607) are provided on the roller frames (606). Multiple side balls (608) are also provided on both sides inside the guide frame (601). The side balls (608) are used to assist the sliding of the third crossbeam (602).

5. A method for supporting irregularly shaped foundation pits in pumping stations according to any one of claims 1-3, characterized in that: The top plate assembly (18) includes a top plate (1804), and a first ear (1803) and a second ear (1805) are provided on one side of the top plate (1804). The first ear (1803) is provided with an elongated hole (1806). The first lug (1803) is connected to the second cylinder (1801), and the second lug (1805) is connected to the third cylinder (1802). The second cylinder (1801) and the third cylinder (1802) are used to adjust the tilt angle of the top plate (1804).

6. The method for supporting irregularly shaped foundation pits in pumping stations according to claim 1, characterized in that: The tensioner (1808) has ratchet teeth on the side near the top plate (1804), and the top plate (1804) also has ratchet teeth on the side facing the tensioner (1808).

Images