Municipal foundation pit support device and construction method thereof

Abstract

The present invention discloses a municipal foundation pit support device and a construction method thereof, belonging to the technical field of foundation pit construction. It comprises: a base, with connecting grooves provided at both ends of the outer side surface, a supporting baffle, which is relatively slidably arranged on the base, the supporting baffle partially extending into the connecting groove to form a plug-in structure, a storage cavity provided in the supporting baffle, a supporting structure, which is arranged between two relative supporting baffles and connected and supported with the relative supporting baffles, an auxiliary baffle, which is slidably arranged in the storage cavity, and the end of the auxiliary baffle in the sliding direction can extend to the outside of the supporting baffle. The auxiliary baffle of the present invention can be moved into a newly excavated foundation pit to temporarily shield and protect the newly excavated foundation pit wall. Construction workers can move to the auxiliary baffle to support the new foundation pit. When the new foundation pit wall collapses, the auxiliary baffle can block most of the soil and slow down the collapse speed of the foundation pit wall, thereby protecting the personal safety of the construction workers.

Description

Technical Field

[0001] The invention relates to a municipal foundation pit supporting device and a construction method thereof, belonging to the technical field of foundation pit construction. Background Art

[0002] During the excavation and support of municipal foundation pits, due to the limited construction site, the excavation and support method is usually adopted. In this way, when encountering the working conditions where there are parallel pipelines next to the excavated foundation pit, the soil between the foundation pit and the parallel pipeline has poor adhesion and the soil layer is more likely to loosen. When the excavation and support method is adopted, the unsupported foundation pit is prone to local collapse accidents during the support process, causing certain harm to the life safety of the construction workers. Therefore, there are certain problems. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a municipal foundation pit support device and a construction method thereof, which solves the problem in the prior art that the soil adhesion between the foundation pit and the parallel pipeline is poor, the soil layer is more likely to loosen, and when the excavation and support method is adopted for construction, the unsupported foundation pit is prone to local collapse accidents during the support process, causing certain harm to the life safety of construction workers.

[0004] The technical problem to be solved by the present invention is achieved by adopting the following technical solution: A municipal foundation pit support device, comprising:

[0005] The base has connecting grooves at both ends of the outer side.

[0006] The supporting baffle is relatively slidably arranged on the base, and the supporting baffle part extends into the connecting groove to form a plug-in structure. A storage cavity is opened in the supporting baffle.

[0007] The supporting structure is arranged between two opposing supporting baffles and connected to the opposing supporting baffles for support.

[0008] The auxiliary baffle is slidably arranged in the storage cavity, and the end of the auxiliary baffle in the sliding direction can extend to the outside of the supporting baffle.

[0009] The sliding groove is provided on the outer side of the support baffle and is connected to the receiving cavity.

[0010] The sliding block is slidably arranged in the sliding groove and the end of the sliding block is fixed to the auxiliary baffle.

[0011] Among them, the base is provided with several spliced ​​arrangements along the extension direction of the foundation pit, the extension direction of the connecting groove is the same as the extension direction of the foundation pit, and several supporting baffles are provided and arranged side by side along the extension direction of the connecting groove. The storage cavity penetrates the supporting baffle along the extension direction of the connecting groove, and the auxiliary baffle can extend into two adjacent supporting baffles.

[0012] By adopting the above technical solution, a base is first installed at the bottom of the preliminarily excavated foundation pit, and then the supporting baffles are hoisted to the parts of the base where the connecting grooves are provided, so that the supporting baffles and the connecting grooves are plugged in, and then a supporting structure is installed between the two supporting baffles. At this time, the supporting baffles have a supporting effect on the walls on both sides of the foundation pit. When the foundation pit needs to be supported after excavating the foundation pit again, the construction workers first enter the supported foundation pit, and then push the sliding block to slide in the sliding groove, so that the sliding block drives the auxiliary baffle to move to the outside of the supporting baffle. At this time, the auxiliary baffle can be moved into the newly excavated foundation pit to temporarily shield and protect the newly excavated foundation pit wall. The construction workers can move to the auxiliary baffle to support the new foundation pit. When the new foundation pit wall collapses, the auxiliary baffle can block most of the soil and slow down the collapse speed of the foundation pit wall, and the construction workers can return to the supported foundation pit, which is conducive to improving the construction safety of the construction workers and protecting the personal safety of the construction workers.

[0013] The present invention is further configured as follows: the support structure includes:

[0014] The support rod has one end hinged to the opposite side of the support baffle.

[0015] The connecting piece is set between the two supporting baffles, and the connecting piece can be fixedly connected to the support rods on the opposite sides of the two supporting baffles through bolt fasteners.

[0016] Among them, when the support rod is connected to the connecting piece, it is perpendicular to the supporting baffle, and a plurality of support rods are arranged in the vertical direction of the supporting baffle.

[0017] By adopting the above technical solution, after the relative support baffles are installed, the support rods are flipped along the hinges so that the support rods and the support baffles are perpendicular. At this time, the relative support rods between the relative support baffles are in the same straight line, and then the connecting plates are clamped on the two relative support rods, and bolt fasteners are installed to fix the support rods and the connecting plates. At this time, the support rods cannot move, and after the support baffles are subjected to wall pressure, the force is transmitted to the support rods and the connecting plates. At this time, the support rods and the connecting plates support the support baffles, which is beneficial to improving the stability of the support baffles.

[0018] The present invention is further configured as follows: open grooves are provided on the sides of the two auxiliary baffles located in the relative supporting baffles that are away from each other, and movable baffles are provided in the open grooves of the two auxiliary baffles that slide in the direction of moving away from each other, a matching groove is provided on the side of the auxiliary baffle facing away from each other, a matching block that is fixedly provided on the movable baffle and is plugged into the matching groove, a connecting hole is provided on the side of the matching block facing the auxiliary baffle, a connecting pipe is provided between the two supporting baffles, one end of the connecting pipe extends into the connecting hole and is threadedly connected to the connecting hole, and a connecting component for promoting the synchronous movement of the connecting pipe and the movable baffle is provided on the supporting structure.

[0019] The present invention is further configured as follows: the connection component includes:

[0020] The synchronization block is set on the support structure, and the synchronization block slides horizontally toward the support baffle.

[0021] One end of the fixed rod is fixedly connected to the synchronous block, and the other end of the fixed rod is sleeved on the outside of the connecting pipe.

[0022] The limiting structure is arranged at the connection between the end of the fixing rod and the connecting pipe, and the limiting structure is used to limit the axial sliding of the connecting pipe.

[0023] The present invention is further configured as follows: the limiting structure includes:

[0024] The limiting cavity is provided on the fixing rod and is connected with the portion of the connecting pipe that passes through the fixing rod. The limiting cavity is provided with a one-way opening.

[0025] The limit block is hingedly arranged in the limit cavity.

[0026] The limiting groove is opened around the circumference of the connecting pipe and is located in the part of the connecting pipe located inside the fixing rod.

[0027] The toggle block is fixed on the limit block and its end extends to the outside of the limit cavity through the opening of the limit cavity.

[0028] Among them, the end of the limiting block away from the hinge can extend into the limiting groove and be engaged with the limiting groove for limiting position.

[0029] The present invention is further configured as follows: the connecting pipe is hollow and a water spray pipe is inserted therein; a plurality of embedded blocks are arranged side by side on the side of the movable baffle away from the auxiliary baffle; the end of the embedded block away from the movable baffle is pointed; a first water guide channel is provided in the movable baffle; a second water guide channel connected to the first water guide channel is provided in the embedded block; and a water outlet hole connected to the external environment of the embedded block is provided through the second water guide channel.

[0030] By adopting the above technical solution, when the soil layer of the foundation pit wall is relatively dry, resulting in poor adhesion of the soil layer, the construction workers can place the synchronous block on the supporting structure, and then use the limit block to extend into the limit groove and engage with the limit groove. At this time, the connecting pipe moves synchronously with the synchronous block through the fixed rod. The construction workers can push the synchronous block, and the synchronous block pushes the connecting pipe to move through the fixed rod, thereby causing the connecting pipe to push the movable baffle to achieve the movement of the movable baffle, which improves the operation convenience of the construction workers when using the connecting pipe. After the movable baffle abuts the soil layer of the wall, the fixed rod is struck with a hammer or other object so that the embedded block can be inserted into the surface of the soil layer, and then the external water supply pipe is connected to the end of the water spray pipe away from the movable baffle. At this time, the water flow of the external water supply pipe flows into the first water guide channel through the water spray pipe, and then enters the second water guide channel and flows into the surface of the soil layer through the water outlet, thereby improving the adhesion of the surface of the soil layer, which is beneficial to improving the stability of the wall near the foundation pit.

[0031] The present invention is further configured as follows: the extending direction of the connecting hole penetrates the movable baffle to form a communicating hole, the communicating hole, the first water guide channel and the connecting hole are connected to each other, a closing block is threadedly connected to the communicating hole, the closing block seals the communicating hole, a plurality of water spray channels are opened in a circumferential array on one side of the water spray pipe close to the communicating hole, the inner wall of the connecting pipe seals the side of the water spray channel away from the axis of the water spray pipe, the closing block can extend to the inside of the water spray pipe toward one end of the water spray pipe, and a locking structure is provided at one end of the closing block toward the water spray pipe, the locking structure can lock the water spray pipe and the closing block into one by cooperating with the water spray channel, the connecting pipe is located at an end away from the movable baffle and an adjusting groove is axially opened, a movable adjusting block is slidably provided in the adjusting groove, one end of the movable adjusting block is fixed to the water spray pipe, a fixed adjusting block is fixed on the outer side of the connecting pipe located away from the auxiliary baffle, an adjusting threaded rod coaxially arranged with the connecting pipe is rotatably provided on the fixed adjusting block, the adjusting threaded rod passes through the movable adjusting block and is threadedly connected to the movable adjusting block.

[0032] The present invention is further configured as follows: the locking structure includes:

[0033] The locking groove is provided on the outer curved surface of the closing block facing the water pipe end.

[0034] The elastic locking piece has its two ends fixed in the locking groove. The middle part of the elastic locking piece is convex and the convex end extends to the outside of the locking groove. The elastic locking piece can extend into the water spray channel to lock the closing block and the water spray pipe.

[0035] By adopting the above technical solution, if the soil layer between the foundation pit and the parallel pipeline is extremely dry, resulting in poor adhesion of the soil layer, when the movable baffle abuts against the soil layer of the foundation pit wall, by rotating the adjusting threaded rod, the adjusting threaded rod causes the movable adjusting block to slide along the adjusting groove under the action of the threaded structure, thereby causing the movable adjusting block to push the water spray pipe toward the soil layer of the foundation pit wall. When the end of the water spray pipe moves into the connecting hole and is locked with the closing block through the locking structure, the raised end of the elastic locking piece extends into the water spray channel, the closing block and the water spray pipe move synchronously, and then the connecting pipe is rotated. Since the movable adjusting block is located in the adjusting groove, the connecting pipe and The water spray pipe cannot rotate relative to each other. When the connecting pipe rotates, the water spray pipe is driven to rotate, and then the closing block is driven to rotate. At this time, the closing block gradually disengages from the threaded connection with the connecting hole. When the threaded connection between the closing block and the connecting hole is released, the user can continue to rotate the adjusting threaded rod to make the water spray pipe continue to move axially relative to the connecting pipe, and insert the closing block and the part of the water spray pipe where the water spray channel is set into the deep of the soil layer, and then connect the water supply pipe to the end of the water spray pipe away from the soil layer. The external water flow is sprayed to the deep soil layer through the water spray pipe and the water spray channel, thereby wetting the deep soil, which is beneficial to improve the adhesion of the deep soil and further improve the stability of the soil layer when supporting the foundation pit.

[0036] The present invention is further configured as follows: a hollow pressing cavity is formed in the closing block, the pressing cavity is connected to the communicating hole, the pressing block is arranged on the side of the closing block away from the water spray pipe, one end of the pressing block extends into the pressing cavity through the end of the closing block, the pressing block slides along the axial direction of the closing block and the sliding connection is sealed, a lubrication hole is provided on the inner wall of the pressing cavity, one end of the lubrication hole passes through the end face of the closing block away from the water spray pipe to penetrate the closing block, the pressing block can close the connection between the pressing cavity and the lubrication hole, an intermediate channel is provided in the pressing block, one end of the intermediate channel can be connected to the lubrication hole, and the other end of the intermediate channel is connected to the pressing cavity.

[0037] By adopting the above technical solution, after the closing block is locked with the water spray pipe, the water spray pipe pushes the closing block toward the soil layer. In the process, the pressing block first abuts against the soil layer. Under the pressure of the soil layer, the pressing block retracts into the pressing cavity. At this time, the middle channel is connected with the lubrication hole. With the water supply of the water spray pipe, the water flows into the middle channel through the pressing cavity and is then sprayed out through the lubrication hole. At this time, the water flow sprayed through the lubrication hole is distributed near the movement path of the closing block driven by the water spray pipe. This can make the soil near the movement path moist, reduce the friction of the water spray pipe and the closing block in the soil layer, and is conducive to the smooth insertion of the water spray pipe and the closing block into the deep soil layer.

[0038] A construction method for a municipal foundation pit support device, the construction method comprising:

[0039] S1: Hoist a base into the bottom of one end of the foundation pit;

[0040] S2: hoist two supporting baffles into the connecting grooves at both ends of the base in sequence, so that the supporting baffles and the connecting grooves form a plug-in structure, and install a supporting structure to support the two opposing supporting baffles;

[0041] S3: Push the sliding block to slide in the sliding groove, so that the sliding block drives one end of the auxiliary baffle to slide to the outside of the supporting baffle;

[0042] S4: hoist a new base into the bottom of the foundation pit and splice the new base onto the previous base along the extension direction of the foundation pit;

[0043] S5: When hoisting new supporting baffles to both ends of the new base, first, the supporting baffle part is connected to the connecting groove to form a plug-in structure, and then the supporting baffle is pushed toward the auxiliary baffle to insert the auxiliary baffle into the new supporting baffle, and the auxiliary baffle part inside the new supporting baffle is pushed out to the outside of the supporting baffle;

[0044] S6: Repeat steps S4 to S5 until the construction reaches the other end of the foundation pit.

[0045] The beneficial effect of the present invention is as follows: first, a base is installed at the bottom of the foundation pit of the preliminary excavation, and then the supporting baffles are hoisted to the parts of the base where the connecting grooves are provided, so that the supporting baffles and the connecting grooves are plugged in, and then the supporting structure is installed between the two supporting baffles. At this time, the supporting baffles have a supporting effect on the walls on both sides of the foundation pit. When the foundation pit needs to be supported after excavating the foundation pit again, the construction workers first enter the supported foundation pit, and then push the sliding block to slide in the sliding groove, so that the sliding block drives the auxiliary baffle to move to the outside of the supporting baffle. At this time, the auxiliary baffle can be moved into the newly excavated foundation pit to temporarily block and protect the newly excavated foundation pit wall. The construction workers can move to the auxiliary baffle to support the new foundation pit. When the new foundation pit wall collapses, the auxiliary baffle can block most of the soil and slow down the collapse speed of the foundation pit wall, and the construction workers can return to the supported foundation pit, which is beneficial to improving the construction safety of the construction workers and protecting the personal safety of the construction workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a structural schematic diagram of the present invention;

[0047] Figure 2 It is a partial structural cross-sectional view of the limiting structure in the present invention;

[0048] Figure 3 A cross-sectional view of the local structure of the connecting pipe and the movable baffle in the present invention when they move synchronously;

[0049] Figure 4 for Figure 3 A magnified view of the structure at point A;

[0050] Figure 5 This is a schematic diagram of the structure of the water spray pipe passing through the connecting hole in the present invention;

[0051] Figure 6 This is a schematic diagram of the structure when the base is installed in the present invention;

[0052] Figure 7 It is a structural diagram showing the positional relationship between the auxiliary baffle and the movable baffle in the present invention.

[0053] In the figure: 10, base; 11, connecting groove; 12, support baffle; 13, storage cavity; 14, support rod;

[0054] 15. Connecting piece; 16. Auxiliary baffle; 17. Matching groove; 18. Stabilizing block; 19. Matching block; 20. Movable baffle; 21. Embedded block; 22. Connecting pipe; 23. Synchronizing block; 24. Fixed rod; 25. Limiting cavity; 26. Limiting block; 27. Limiting groove; 28. Toggle block; 29. ​​Water spray pipe; 30. Water spray channel; 31. First water guide channel; 32. Second water guide channel; 33. Water outlet; 34. Connecting hole; 35. Closing block; 36. Locking groove; 37. Elastic locking piece; 38. Pressing cavity; 39. Lubrication hole; 40. Pressing block; 41. Middle channel; 42. Movable adjusting block; 43. Adjusting threaded rod; 44. Sliding groove; 45. Sliding block; 46. Connecting hole; 47. Opening groove; 48. Fixed adjusting block; 49. Adjusting groove. DETAILED DESCRIPTION

[0055] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the present invention is further explained below with reference to specific illustrations.

[0056] like Figure 1 and Figure 5As shown, a municipal foundation pit support device includes a base 10, a support baffle 12, an auxiliary baffle 16, a sliding groove 44, a sliding block 45 and a support structure. The base 10 is provided with several spliced ​​arrangements along the extension direction of the foundation pit. Both ends of the outer side surface of the base 10 are provided with connecting grooves 11, and the extension direction of the connecting groove 11 is the same as the extension direction of the foundation pit. The support baffle 12 is relatively slidably arranged on the base 10, and the support baffle 12 partially extends into the connecting groove 11 to form a plug-in structure. There are several support baffles 12 and they are arranged side by side along the extension direction of the connecting groove 11. A storage cavity 13 is opened in the support baffle 12, and the storage cavity 13 passes through the support baffle 12 along the extension direction of the connecting groove 11. The support structure is disposed between two opposing support baffles 12 and is connected to and supported by the opposing support baffles 12. The auxiliary baffle 16 is slidably disposed within the storage chamber 13. The sliding direction of the auxiliary baffle 16 is the same as the extension direction of the storage chamber 13. The end of the auxiliary baffle 16 can extend outside the support baffle 12. When two support baffles 12 located on the same side of the base 10 are abutted side by side, the auxiliary baffle 16 can extend into the two adjacent support baffles 12. A sliding groove 44 is provided on the outer side of the support baffle 12 and communicates with the storage chamber 13. The extension direction of the sliding groove 44 is the same as that of the connecting groove 11. A sliding block 45 is disposed within the sliding groove 44, and the end of the sliding block 45 is fixed to the auxiliary baffle 16. The sliding block 45 is slidably disposed along the extension direction of the sliding groove 44. The maximum displacement length of the sliding block 45 in the sliding groove 44 is half the width of the auxiliary baffle 16 along the extension direction 11.

[0057] like Figure 1 As shown, a stabilizing block 18 is fixedly mounted on the surface of the auxiliary baffle 16. A stabilizing groove is defined within the receiving chamber 13 to cooperate with the stabilizing block 18. The stabilizing block 18 extends into the stabilizing groove and is slidably connected thereto. During the sliding movement of the auxiliary baffle 16, the cooperation between the stabilizing groove and the stabilizing block 18 ensures that the auxiliary baffle 16 moves stably in a straight line.

[0058] like Figure 5 As shown, the support structure includes a support rod 14 and a connecting piece 15. One end of the support rod 14 is hinged to the opposite side of the support baffle 12. A plurality of support rods 14 are provided in the vertical direction of the support baffle 12, and the plurality of support rods 14 located on the opposite support baffles 12 are horizontally aligned in pairs. The connecting piece 15 is provided between the two support baffles 12 and can be fixedly connected to the support rods 14 on the opposite sides of the two support baffles 12 by bolt fasteners. When the support rods 14 are connected to the connecting piece 15, they are perpendicular to the support baffles 12.

[0059] like Figure 6 and Figure 7As shown, the two auxiliary baffles 16 located in the opposing support baffles 12 have open slots 47 on their sides facing away from each other. The width of the open slots 47 along the extension direction of the 11 is equal to half the width of the auxiliary baffles 16. A movable baffle 20 is slidably disposed in the open slots 47 of the two auxiliary baffles 16 in the direction of moving away from each other. A mating slot 17 is formed through the side of the auxiliary baffles 16 facing away from each other. A mating block 19 is fixedly disposed on the movable baffle 20 and plugs into the mating slot 17. The mating block 19 has a connecting hole 46 on the side facing the auxiliary baffle 16. A connecting tube 22 is disposed between the two support baffles 12. One end of the connecting tube 22 extends into the connecting hole 46 and is threadedly connected to the connecting hole 46. The support structure is provided with a connecting assembly for promoting the synchronous movement of the connecting tube 22 and the movable baffle 20. When the sliding block 45 slides to the maximum length in the sliding slot 44, the movable baffle 20 is completely removed from the storage chamber 13.

[0060] like Figure 1 and Figure 2 As shown, the connection assembly includes a synchronization block 23, a fixed rod 24, and a limiting structure. The synchronization block 23 is detachably mounted on the support structure. When the support rod 14 is connected via the connecting plate 15, a horizontally extending support is formed. At this point, the synchronization block 23 is placed on the support rod 14 and the connecting plate 15 and can slide horizontally toward the support baffle 12. One end of the fixed rod 24 is fixedly connected to the synchronization block 23, and the other end of the fixed rod 24 is sleeved outside the connecting tube 22. The limiting structure is located at the connection between the end of the fixed rod 24 and the connecting tube 22, and is used to limit the axial sliding of the connecting tube 22. The limiting structure includes a limiting cavity 25, a limiting block 26, a limiting slot 27, and a toggle block 28. The limiting cavity 25 is provided on the fixed rod 24 and communicates with the portion of the connecting tube 22 that passes through the fixed rod 24. The limiting cavity 25 is provided with a one-way opening. One end of the limiting block 26 is hingedly mounted at the opening of the limiting cavity 25, and the other end of the limiting block 26 extends into the limiting cavity 25. A stop groove 27 circumferentially surrounds the connecting tube 22, extending within the portion of the connecting tube 22 located within the fixing rod 24. The end of the stop block 26, distal from the hinge, can extend into the stop groove 27 and engage with it for a fixed position. A toggle block 28 is fixed to the stop block 26, with its end extending through the opening of the limit cavity 25 to the outside of the limit cavity 25. By toggling the toggle block 28, the construction worker flips the stop block 26, inserting or removing it from the stop groove 27, thereby limiting or releasing the axial sliding movement of the connecting tube 22.

[0061] like Figure 3 and Figure 4As shown, the connecting pipe 22 is hollow and has a water spray pipe 29 inserted therein. The end of the water spray pipe 29 away from the movable baffle 20 can be connected to an external water supply device via a hose. The hose can follow the movement of the water spray pipe 29 and is inserted into the connecting pipe 22 through the end of the connecting pipe 22. Several embedded blocks 21 are arranged side by side on the side of the movable baffle 20 away from the auxiliary baffle 16. The ends of the embedded blocks 21 away from the movable baffle 20 are pointed. A first water channel 31 is defined within the movable baffle 20, and a second water channel 32 is defined within the embedded blocks 21, which communicates with the first water channel 31. A plurality of water outlet holes 33 are provided through the second water channel 32, which communicate with the environment outside the embedded blocks 21.

[0062] like Figure 4 and Figure 5 As shown, the extending direction of the connecting hole 46 penetrates the movable baffle 20 to form a connecting hole 34. The connecting hole 34, the first water guide channel 31 and the connecting hole 46 are connected to each other. The connecting hole 34 is internally threaded with a closing block 35. The closing block 35 seals the connecting hole 34. A plurality of water spray channels 30 are formed in a circumferential array on one side of the water spray pipe 29 near the connecting hole 34. The inner wall of the connecting pipe 22 seals the side of the water spray channel 30 away from the axis of the water spray pipe 29. The end of the closing block 35 toward the water spray pipe 29 can extend to the inside of the water spray pipe 29. The end of the closing block 35 toward the water spray pipe 29 is provided with a locking structure. The locking structure can lock the water spray pipe 29 and the closing block 35 into one by cooperating with the water spray channel 30. The connecting pipe 22 is located at the end away from the movable baffle 20 and is axially provided with an adjustment groove 49. A movable adjustment block 42 is slidingly arranged in the adjustment groove 49. One end of the movable adjustment block 42 is fixed to the water spray pipe 29. A fixed adjustment block 48 is fixed on the outer side of the fixing rod 24 away from the auxiliary baffle 16 on the connecting pipe 22. An adjustment threaded rod 43 which is coaxially arranged with the connecting pipe 22 is rotatably provided on the fixed adjustment block 48. The adjustment threaded rod 43 passes through the movable adjustment block 42 and is threadedly connected to the movable adjustment block 42.

[0063] like Figure 4As shown, the locking structure includes a locking groove 36 and an elastic locking piece 37. The locking groove 36 is provided on the outer curved surface of the end of the closure block 35 facing the water spray pipe 29. There are multiple locking grooves 36, which are arranged at equal angles along the circumference of the closure block 35. The ends of the elastic locking piece 37 are fixed in the locking groove 36. The ends of the elastic locking piece 37 are distributed along the axial direction of the closure block 35. The middle portion of the elastic locking piece 37 is provided in a raised shape, and the raised end extends outside the locking groove 36. The elastic locking piece 37 can extend into the water spray channel 30 to lock the closure block 35 and the water spray pipe 29. When the end of the closing block 35 is gradually inserted into the inner side of the water spray pipe 29, the elastic locking piece 37 is squeezed by the end of the water spray pipe 29 and retracts into the locking groove 36. When the locking groove 36 is aligned with the opening of the water spray channel 30, the elastic locking piece 37 extends into the water spray channel 30 under the elastic action. At this time, since the two ends of the elastic locking piece 37 are distributed along the axial direction of the closing block 35, when the water spray pipe 29 rotates, the elastic locking piece 37 is subjected to the tangential force exerted by the water spray channel 30, so the elastic locking piece 37 will not retract into the locking groove 36, so the water spray pipe 29 can rotate synchronously with the closing block 35.

[0064] like Figure 4 As shown, the closing block 35 is hollow and is provided with a pressing cavity 38, which is connected to the communicating hole 34. The pressing block 40 is provided on the side of the closing block 35 away from the water spray pipe 29. One end of the pressing block 40 extends into the pressing cavity 38 through the end of the closing block 35. The pressing block 40 slides along the axial direction of the closing block 35 and the sliding connection is sealed. A lubrication hole 39 is provided on the inner wall of the pressing cavity 38. One end of the lubrication hole 39 passes through the closing block 35 through the end face of the closing block 35 away from the water spray pipe 29. The pressing block 40 can close the connection between the pressing cavity 38 and the lubrication hole 39. An intermediate channel 41 is provided in the pressing block 40. One end of the intermediate channel 41 can be connected to the lubrication hole 39, and the other end of the intermediate channel 41 is connected to the pressing cavity 38. When the pressing block 40 retracts into the pressing cavity 38 , the lubricating hole 39 is connected to the middle channel 41 . When the pressing block 40 does not retract into the pressing cavity 38 , the lubricating hole 39 is disconnected from the middle channel 41 .

[0065] First, install the base 10 to the bottom of the initially excavated foundation pit, and then hoist the supporting baffles 12 to the part of the base 10 where the connecting grooves 11 are opened, so that the supporting baffles 12 and the connecting grooves 11 are plugged in, and then install the supporting structure between the two supporting baffles 12. At this time, the supporting baffles 12 have a supporting effect on the walls on both sides of the foundation pit. When the foundation pit is excavated again, the length of the re-excavated foundation pit needs to be greater than half the width of the auxiliary baffle 16 plus the sum of the widths of the supporting baffles 12 to ensure that the new supporting baffles 12 can be hoisted into the foundation pit while using the auxiliary baffles 16. When it is necessary to support a newly excavated foundation pit, the construction workers first enter the supported foundation pit, and then push the sliding block 45 to slide in the sliding groove 44, so that the sliding block 45 drives the auxiliary baffle 16 to move to the outside of the supporting baffle 12. At this time, the auxiliary baffle 16 can be moved into the newly excavated foundation pit to temporarily shield and protect the newly excavated foundation pit wall. The construction workers can move to the auxiliary baffle 16 to support the new foundation pit. When the new foundation pit wall collapses, the auxiliary baffle 16 can block most of the soil and slow down the collapse speed of the foundation pit wall. The construction workers can return to the supported foundation pit, which is conducive to improving the construction safety of the construction workers and protecting the personal safety of the construction workers.

[0066] After the relative support baffles 12 are installed, the support rods 14 are flipped along the hinge so that the support rods 14 are perpendicular to the support baffles 12. At this time, the relative support rods 14 between the relative support baffles 12 are in the same straight line, and then the connecting pieces 15 are clamped on the two relative support rods 14, and bolt fasteners are installed to fix the support rods 14 and the connecting pieces 15. At this time, the support rods 14 cannot move. After the support baffles 12 are subjected to wall pressure, the force is transmitted to the support rods 14 and the connecting pieces 15. At this time, the support rods 14 and the connecting pieces 15 support the support baffles 12, which is beneficial to improve the stability of the support baffles 12.

[0067] When the soil layer of the foundation pit wall is relatively dry, resulting in poor adhesion of the soil layer, the construction workers can place the synchronization block 23 on the supporting structure, and then use the limit block 26 to extend into the limit groove 27 and engage with the limit groove 27. At this time, the connecting pipe 22 moves synchronously with the synchronization block 23 through the fixed rod 24. The construction workers can push the synchronization block 23, and the synchronization block 23 pushes the connecting pipe 22 to move through the fixed rod 24, thereby causing the connecting pipe 22 to push the movable baffle 20 to achieve the movement of the movable baffle 20. Since the synchronization block 23 moves along the support structure formed by the combination of the support rod 14 and the connecting piece 15, the horizontality of the movement of the synchronization block 23 can be effectively maintained. At this time, the connecting pipe 22 can maintain a certain level when moving, so that the construction workers do not need to calibrate the movement level of the connecting pipe 22 for a long time, which improves the operation convenience of the construction workers when using the connecting pipe 22. After the movable baffle 20 abuts against the soil layer of the wall, the fixed rod 24 is struck with a hammer or other object so that the embedded block 21 can be inserted into the surface layer of the soil layer, and then the external water supply pipeline is connected to the end of the water spray pipe 29 away from the movable baffle 20. At this time, the water flow of the external water supply pipeline flows into the first water guide channel 31 through the water spray pipe 29, and then enters the second water guide channel 32 and flows into the surface layer of the soil layer through the water outlet 33, thereby improving the adhesion of the surface layer of the soil layer, which is beneficial to improving the stability of the wall near the foundation pit.

[0068] If the soil layer between the foundation pit and the parallel pipeline is extremely dry, resulting in poor adhesion of the soil layer, when the movable baffle 20 abuts against the soil layer of the foundation pit wall, by rotating the adjusting threaded rod 43, the adjusting threaded rod 43 causes the movable adjusting block 42 to slide along the adjusting groove 49 under the action of the threaded structure, so that the movable adjusting block 42 pushes the water spray pipe 29 toward the soil layer of the foundation pit wall. When the end of the water spray pipe 29 moves into the connecting hole 34 and is locked with the closing block 35 through the locking structure, the raised end of the elastic locking piece 37 extends into the water spray channel 30, the closing block 35 and the water spray pipe 29 move synchronously, and then the connecting pipe 22 is rotated. Since the movable adjusting block 42 is located in the adjusting groove 49, the connecting pipe 22 and the water spray pipe 2 9 cannot rotate relative to each other. When the connecting pipe 22 rotates, the water spray pipe 29 is driven to rotate, and then the closing block 35 is driven to rotate. At this time, the closing block 35 gradually disengages from the threaded connection with the connecting hole 34. When the threaded connection between the closing block 35 and the connecting hole 34 is released, the user can continue to rotate the adjusting threaded rod 43 to make the water spray pipe 29 continue to move axially relative to the connecting pipe 22, and make the closing block 35 and the part of the water spray pipe 29 where the water spray channel 30 is set be inserted deep into the soil layer, and then make the end of the water spray pipe 29 away from the soil layer be connected to the water supply pipe. The external water flow is sprayed to the deep soil layer through the water spray pipe 29 and the water spray channel 30, thereby wetting the deep soil, which is beneficial to improving the cohesion of the deep soil and further improving the stability of the soil layer when supporting the foundation pit.

[0069] After the closing block 35 is locked with the water spray pipe 29, the water spray pipe 29 pushes the closing block 35 toward the soil layer. The pressing block 40 first contacts the soil layer. Under the pressure of the soil layer, the pressing block 40 retracts into the pressing cavity 38. At this time, the middle channel 41 is connected with the lubrication hole 39. With the water supply of the water spray pipe 29, the water flows into the middle channel 41 through the pressing cavity 38, and then is sprayed out through the lubrication hole 39. At this time, the water flow sprayed through the lubrication hole 39 is distributed near the movement path of the closing block 35 driven by the water spray pipe 29. This can make the soil near the movement path moist, reduce the friction of the water spray pipe 29 and the closing block 35 in the soil layer, and facilitate the smooth insertion of the water spray pipe 29 and the closing block 35 into the deep soil layer. When it is necessary to pull out the water spray pipe 29 and the closing block 35, the movable adjusting block 42 drives the water spray pipe 29 to move away from the soil layer by rotating the adjusting threaded rod 43 in the opposite direction, and the water spray pipe 29 drives the closing block 35 to be pulled out. During the process of pulling out the closing block 35, since the part of the soil layer where the water spray pipe 29 is inserted is already moist and has strong adhesion, the collapse rate of the water spray pipe 29 is slow after it is pulled out, and the closing block 35 will not be subject to large resistance. The edge of the water spray channel 30 will not exert strong squeezing on the elastic locking piece 37, so the elastic locking piece 37 will not fall out of the water spray channel 30, and the closing block 35 can stably follow the movement of the water spray pipe 29. As the adjusting threaded rod 43 continues to move, the closing block 35 is gradually inserted into the connecting hole 34. At this time, the connecting pipe 22 is rotated in the opposite direction, so that the water spray pipe 29 drives the closing block 35 to move in the opposite direction, and finally the closing block 35 is threadedly connected to the connecting hole 34 again, completing the reset of the closing block 35. Then the adjusting threaded rod 43 is continued to be rotated to reset the water spray pipe 29. Under the continuous movement of the water spray pipe 29, the elastic locking piece 37 at the edge of the water spray channel 30 is pressed into the locking groove 36, so that the elastic locking piece 37 is disengaged from the water spray channel 30, completing the separation of the closing block 35 and the water spray pipe 29.

[0070] When the closing block 35 is separated from the soil layer, the soil layer releases the squeeze on the pressing block 40. At this time, water can continue to be supplied to the pressing chamber 38. Under the pressure of the water flow, the pressing block 40 is pushed to the starting position. At this time, the intermediate channel 41 is disconnected from the lubrication hole 39. The water flow cannot be sprayed out through the lubrication hole 39, and can only be sprayed out from the water outlet 33 through the first water guide channel 31 and the second water guide channel 32, thereby achieving the purpose of automatically resetting the pressing block 40 and closing the connecting hole 34.

[0071] A construction method for a municipal foundation pit support device, the construction method comprising:

[0072] S1: A base 10 is hoisted into the bottom of one end of the foundation pit;

[0073] S2: hoist two supporting baffles 12 into the connecting grooves 11 at both ends of the base 10 in sequence, so that the supporting baffles 12 and the connecting grooves 11 form a plug-in structure, and install a supporting structure to support the two opposing supporting baffles 12;

[0074] S3: Push the sliding block 45 to slide in the sliding groove 44, so that the sliding block 45 drives one end of the auxiliary baffle 16 to slide to the outside of the supporting baffle 12;

[0075] S4: hoisting a new base 10 into the bottom of the foundation pit, and splicing the new base 10 onto the previous base 10 along the extension direction of the foundation pit;

[0076] S5: When hoisting the new supporting baffles 12 to both ends of the new base 10, first, a portion of the supporting baffle 12 is connected to the connecting groove 11 to form a plug-in structure, and then the supporting baffle 12 is pushed toward the auxiliary baffle 16 to insert the auxiliary baffle 16 into the new supporting baffle 12, and the auxiliary baffle 16 portion inside the new supporting baffle 12 is pushed out to the outside of the supporting baffle 12;

[0077] S6: Repeat steps S4 to S5 until the construction reaches the other end of the foundation pit.

[0078] In step S3, if the external soil layer is dry, use an external water supply device to connect to the end of the water spray pipe 29 to spray water onto the surface of the soil layer through the water outlet 33, or insert the water spray pipe 29 into the soil layer to moisten the deep soil.

[0079] Before starting step S4 , the closing block 35 and the movable baffle 20 need to be reset, that is, the movable baffle 20 needs to be retracted into the open groove 47 , and the connecting pipe 22 needs to be unscrewed from the connecting hole 46 for removal.

[0080] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art will appreciate that the present invention is not limited to the foregoing embodiments and that various modifications and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such modifications and improvements are intended to fall within the scope of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A municipal foundation pit support device, characterized by: include: The base (10) has connecting grooves (11) at both ends of the outer side. The supporting baffle (12) is relatively slidably arranged on the base (10), and a portion of the supporting baffle (12) extends into the connecting groove (11) to form a plug-in structure. A receiving cavity (13) is provided in the supporting baffle (12). A support structure is provided between two opposing support baffles (12) and is connected to and supported by the opposing support baffles (12). The auxiliary baffle (16) is slidably disposed in the receiving cavity (13), and the end portion of the auxiliary baffle (16) in the sliding direction can extend to the outside of the supporting baffle (12). The sliding groove (44) is provided on the outer side of the supporting baffle (12) and communicates with the receiving cavity (13). A sliding block (45) is slidably disposed in the sliding groove (44) and an end portion of the sliding block (45) is fixed to the auxiliary baffle (16). The base (10) is provided with a plurality of spliced ​​and arranged along the extension direction of the foundation pit, the extension direction of the connecting groove (11) is the same as the extension direction of the foundation pit, a plurality of supporting baffles (12) are provided and arranged side by side along the extension direction of the connecting groove (11), the receiving cavity (13) penetrates the supporting baffles (12) along the extension direction of the connecting groove (11), and the auxiliary baffle (16) can extend into two adjacent supporting baffles (12); Two auxiliary baffles (16) located in the relative supporting baffle (12) are provided with open grooves (47) on the sides away from each other, and movable baffles (20) are provided in the open grooves (47) of the two auxiliary baffles (16) so as to slide in the direction away from each other, and a matching groove (17) is provided on the auxiliary baffle (16) on the side away from each other, and a matching block (19) is fixedly provided on the movable baffle (20) and is plugged into the matching groove (17), and a connecting hole (46) is provided on the matching block (19) on the side facing the auxiliary baffle (16), and a connecting pipe (22) is provided between the two supporting baffles (12), and one end of the connecting pipe (22) extends into the connecting hole (46) and is threadedly connected to the connecting hole (46), and a connecting component for pushing the connecting pipe (22) and the movable baffle (20) to move synchronously is provided on the supporting structure; The connecting pipe (22) is hollow and has a water spray pipe (29) inserted therein. A plurality of embedded blocks (21) are arranged side by side on the side of the movable baffle (20) away from the auxiliary baffle (16). One end of the embedded block (21) away from the movable baffle (20) is pointed. A first water guide channel (31) is provided in the movable baffle (20). A second water guide channel (32) communicating with the first water guide channel (31) is provided in the embedded block (21). A water outlet hole (33) communicating with the external environment of the embedded block (21) is provided through the second water guide channel (32). The connecting hole (46) extends in a direction that penetrates the movable baffle (20) to form a connecting hole (34). The connecting hole (34), the first water guide channel (31) and the connecting hole (46) are connected to each other. The connecting hole (34) is internally threaded with a closing block (35). The closing block (35) seals the connecting hole (34). A plurality of water spray channels (30) are provided along a circumferential array on one side of the water spray pipe (29) close to the connecting hole (34). The inner wall of the connecting pipe (22) seals the side of the water spray channel (30) away from the axis of the water spray pipe (29). One end of the closing block (35) facing the water spray pipe (29) can extend to the inside of the water spray pipe (29). One end of the closing block (35) facing the water spray pipe (29) is provided with a locking structure. The fixed structure can lock the water spray pipe (29) and the closing block (35) into one piece by cooperating with the water spray channel (30). The connecting pipe (22) is provided with an adjustment groove (49) in the axial direction at one end thereof which is located away from the movable baffle (20). A movable adjustment block (42) is slidably provided in the adjustment groove (49). One end of the movable adjustment block (42) is fixed to the water spray pipe (29). A fixed adjustment block (48) is fixed to the outer side surface of the connecting pipe (22) which is located away from the auxiliary baffle (16) at the fixed rod (24). An adjustment threaded rod (43) which is coaxially arranged with the connecting pipe (22) is rotatably provided on the fixed adjustment block (48). The adjustment threaded rod (43) passes through the movable adjustment block (42) and is threadedly connected to the movable adjustment block (42).

2. A municipal foundation pit support device according to claim 1, characterized in that: The supporting structure includes: A support rod (14) is hinged at one end to the opposite side of the support baffle (12). A connecting piece (15) is provided between the two supporting baffles (12), and the connecting piece (15) can be fixedly connected to the support rods (14) on the opposite surfaces of the two supporting baffles (12) by bolt fasteners at the same time. The support rod (14) is perpendicular to the support baffle (12) when connected to the connecting piece (15), and a plurality of support rods (14) are provided in the vertical direction of the support baffle (12).

3. A municipal foundation pit support device according to claim 1, characterized in that: Connectivity components include: The synchronization block (23) is arranged on the support structure, and the synchronization block (23) is arranged to slide horizontally toward the support baffle (12). One end of the fixed rod (24) is fixedly connected to the synchronous block (23), and the other end of the fixed rod (24) is sleeved on the outside of the connecting pipe (22). A limiting structure is provided at the connection between the end of the fixing rod (24) and the connecting tube (22), and the limiting structure is used to limit the axial sliding of the connecting tube (22).

4. A municipal foundation pit support device according to claim 3, characterized in that: The limiting structure includes: The limiting cavity (25) is provided on the fixing rod (24) and is in communication with the portion of the connecting pipe (22) that passes through the fixing rod (24). The limiting cavity (25) is provided with a one-way opening. The limiting block (26) is hingedly arranged in the limiting cavity (25). The limiting groove (27) is circumferentially opened around the connecting pipe (22) and is located in the portion of the connecting pipe (22) located inside the fixing rod (24). The toggle block (28) is fixed on the limit block (26) and the end portion thereof extends to the outside of the limit cavity (25) through the opening of the limit cavity (25). The end of the limiting block (26) away from the hinge can extend into the limiting groove (27) and engage with the limiting groove (27) for limiting position.

5. The municipal foundation pit support device according to claim 1, characterized in that: The locking structure includes: The locking groove (36) is provided on the outer curved surface of the closing block (35) facing the water spray pipe (29). The elastic locking piece (37) is fixed at both ends in the locking groove (36). The middle portion of the elastic locking piece (37) is provided in a convex shape and the convex end extends to the outside of the locking groove (36). The elastic locking piece (37) can extend into the water spray channel (30) to lock the closing block (35) and the water spray pipe (29).

6. The municipal foundation pit support device according to claim 1, characterized in that: The closing block (35) is hollow and is provided with a pressing cavity (38). The pressing cavity (38) is connected with the communicating hole (34). The pressing block (40) is provided on the side of the closing block (35) away from the water spray pipe (29). One end of the pressing block (40) extends into the pressing cavity (38) through the end of the closing block (35). The pressing block (40) slides along the axial direction of the closing block (35) and the sliding connection is sealed. A lubrication hole (39) is provided on the inner wall of the pressing cavity (38). One end of the lubrication hole (39) passes through the closing block (35) away from the end face of the water spray pipe (29). The pressing block (40) can close the connection between the pressing cavity (38) and the lubrication hole (39). An intermediate channel (41) is provided in the pressing block (40). One end of the intermediate channel (41) can be connected with the lubrication hole (39), and the other end of the intermediate channel (41) is connected with the pressing cavity (38).

7. A construction method for a municipal foundation pit support device according to any one of claims 1 to 6, characterized in that: The construction method comprises: S1: hoist a base (10) into the bottom of one end of the foundation pit; S2: hoisting two supporting baffles (12) into the connecting grooves (11) at both ends of the base (10) in sequence, so that the supporting baffles (12) and the connecting grooves (11) form a plug-in structure, and installing a supporting structure to support the two opposing supporting baffles (12); S3: Pushing the sliding block (45) to slide in the sliding groove (44), so that the sliding block (45) drives one end of the auxiliary baffle (16) to slide to the outside of the supporting baffle (12); S4: hoisting a new base (10) into the bottom of the foundation pit, and splicing the new base (10) onto the previous base (10) along the extension direction of the foundation pit; S5: When hoisting the new supporting baffles (12) to both ends of the new base (10), first, a portion of the supporting baffle (12) is connected to the connecting groove (11) to form a plug-in structure, and then the supporting baffle (12) is pushed toward the auxiliary baffle (16) to insert the auxiliary baffle (16) into the new supporting baffle (12), and the auxiliary baffle (16) inside the new supporting baffle (12) is pushed out to the outside of the supporting baffle (12); S6: Repeat steps S4 to S5 until the construction reaches the other end of the foundation pit.

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