Prefabricated inspection well and manufacturing method thereof

Abstract

The present invention relates to the technical field of inspection wells, and specifically discloses a prefabricated inspection well and a manufacturing method thereof, including an inspection well cover, an upper inspection well, an inspection well connecting pipe, and a lower inspection well. An upper inspection well, an inspection well connecting pipe, and a lower inspection well are sequentially arranged below the inspection well cover. The upper inspection well, the inspection well connecting pipe, and the lower inspection well are plugged into each other. A detachable ladder is arranged on the inner wall of the inspection well connecting pipe. The ladder includes a plurality of climbing poles, connecting ropes, and connecting pieces. The plurality of climbing poles include a cross bar and a folding rod. Adjacent cross bars are connected by connecting ropes. An installation pipe is embedded on the inner wall of the inspection well connecting pipe, and the installation pipe corresponds to the folding rod. The present invention adopts the above-mentioned prefabricated inspection well and a manufacturing method thereof. The inspection well has a simple structure, a simple installation process, and a high installation efficiency. The ladder is detachable, which increases the space in the inspection well, increases the activity space of the staff, and improves the work efficiency of the staff.

Description

Technical Field

[0001] The present invention relates to the technical field of assembled inspection wells, and in particular to a prefabricated assembled inspection well and a manufacturing method thereof. Background Art

[0002] Inspection wells are set up for the maintenance of urban underground infrastructure such as power supply, water supply, drainage, sewage, communications, cable TV, gas pipes, and street light lines, and are easy to install. They are generally located at pipeline intersections, bends, places where pipe diameters or slopes change, and at certain intervals on straight pipe sections to facilitate regular inspection of ancillary structures. Initially, inspection wells were first molded and then concreted. After pouring, it still took some time for the concrete to solidify before the molds inside the inspection well could be removed. This method wasted a lot of time and had low construction efficiency. Nowadays, through prefabricated inspection wells and reasonably designed prefabricated inspection wells, they are prefabricated separately and then assembled, which effectively reduces the difficulty of construction, shortens the construction time, and saves time and effort.

[0003] The existing prefabricated inspection wells have a complex structure, cumbersome assembly, complicated installation process, and low installation efficiency. In addition, the prefabricated inspection wells can generally accommodate one person, and the ladder in the prefabricated inspection well is a fixed setting. The ladder protrudes from the inner wall of the well, occupying the space inside the prefabricated inspection well. When the staff turns around in the well, they often collide with the ladder protruding from the inner wall of the well. When it is necessary to clean the garbage inside the drainage pipe or transport items, the operation is inconvenient, affecting the work efficiency of the staff. Summary of the invention

[0004] The purpose of the present invention is to provide a prefabricated inspection well and a method for making the same, which has a simple structure, a simple installation process, high installation efficiency, a detachable ladder, and increases the space in the inspection well, increases the space for staff activities, and improves the work efficiency of staff.

[0005] To achieve the above-mentioned purpose, the present invention provides a prefabricated and assembled inspection well, including an inspection well cover, an upper inspection well, an inspection well connecting pipe, and a lower inspection well. An upper inspection well, an inspection well connecting pipe, and a lower inspection well are arranged in sequence below the inspection well cover. The upper inspection well and the lower inspection well are connected through the inspection well connecting pipe. The upper inspection well, the inspection well connecting pipe, and the lower inspection well are plugged into each other. A detachable ladder is arranged on the inner wall of the inspection well connecting pipe. The ladder includes multiple climbing poles, connecting ropes, and connecting parts. The multiple climbing poles include cross bars and folding bars. Adjacent cross bars are connected by connecting ropes. An installation pipe is embedded in the inner wall of the inspection well connecting pipe, and the installation pipe corresponds to the folding rod.

[0006] Preferably, the bottom of the upper inspection well is provided with an inverted L-shaped groove extending toward the inner wall of the upper inspection well, the top inner wall of the inspection well connecting pipe is provided with an L-shaped groove extending toward the outer wall, the bottom of the inspection well connecting pipe is provided with an inverted L-shaped groove extending toward the inner wall of the inspection well connecting pipe, and the top inner wall of the lower inspection well is provided with an L-shaped groove extending toward the outer wall, the inverted L-shaped groove is adapted to the L-shaped groove, and the inverted L-shaped groove is inserted into the L-shaped groove.

[0007] Preferably, the L-shaped groove and the inverted L-shaped groove are fixedly connected by bolts, and the bolts penetrate the L-shaped groove wall and extend into the inverted L-shaped groove wall. The L-shaped groove wall and the inverted L-shaped groove wall are both provided with threaded sleeves that cooperate with the bolts.

[0008] Preferably, both ends of the cross bar are provided with mounting grooves, one end of the mounting groove is open, one end of the folding rod is rotatably connected to the inside of the mounting groove through a rotating shaft, and the other end is plugged into the mounting tube, and both ends of the rotating shaft are rotatably connected to the inner wall of the mounting groove respectively.

[0009] Preferably, a fixing rod is laterally provided at one end of the folding rod away from the cross rod, and a first connecting rod and a second connecting rod are rotatably connected at the center of the fixing rod, the first connecting rod and the second connecting rod are cross-arranged on the fixing rod, and the first connecting rod and the second connecting rod are closely arranged on the fixing rod, and a pressure rod penetrating the inner wall of the folding rod is provided at one end of the first connecting rod and the second connecting rod close to the cross rod, and an insertion rod penetrating the inner wall of the folding rod is provided at one end of the first connecting rod and the second connecting rod away from the cross rod, and through holes for the pressure rod and the insertion rod to move are respectively provided on the inner wall of the folding rod, and the first connecting rod and the second connecting rod are respectively connected at one end close to the cross rod by a first spring, and a slot corresponding to the insertion rod is provided on the inner wall of the mounting tube.

[0010] Preferably, both ends of the cross bar are provided with connecting parts, and the connecting parts include an upper pull ring, a lower pull ring, and a rotating ring. The upper pull ring and the lower pull ring are respectively located at the upper and lower ends of the rotating ring. The rotating ring is sleeved on the outer wall of the cross bar, and the cross bar is rotatably connected to the rotating ring. One end of the connecting rope is connected to the lower pull ring of the connecting part on the cross bar, and the other end thereof is connected to the upper pull ring of the connecting part on the adjacent cross bar.

[0011] Preferably, a limit block is provided on the inner side of the cross bar, the limit block is hollow inside, a limit column perpendicular to the folding rod is provided on the inner side of the folding rod, the limit block is provided with an opening on one side close to the limit column, the limit column enters into the limit block through the opening, a guide tube is provided inside the end of the limit block away from the cross bar, a pull rod is provided inside the guide tube, one end of the pull rod passes through the inner wall of the limit block, the other end passes through the guide tube and extends to the outside of the wire tube, a second spring is sleeved on the outside of the pull rod, one end of the second spring is fixedly connected to the inner wall of the limit block, and the other end of the second spring is fixedly connected to the outer wall of the pull rod, and the end of the limit column located inside the limit block is provided with a through hole for the pull rod to pass through.

[0012] A method for manufacturing a prefabricated inspection well comprises the following steps:

[0013] S1. First, the manhole cover, upper manhole, manhole connecting pipe and lower manhole are prefabricated with concrete slurry. When prefabricating the upper manhole, manhole connecting pipe and lower manhole, an inverted L-shaped groove and an L-shaped groove are reserved at the assembly positions of the upper manhole, manhole connecting pipe and lower manhole according to the assembly requirements. Threaded sleeves are pre-embedded on the inverted L-shaped groove wall and the L-shaped groove wall respectively, and an installation pipe is pre-embedded on the inner wall of the manhole connecting pipe;

[0014] S2. Place the prefabricated lower inspection well in the pre-dug foundation pit by hoisting equipment, and then align the inverted L-shaped groove at the bottom of the inspection well connecting pipe with the L-shaped groove at the top of the lower inspection well by hoisting equipment, and then thread the bolts and threaded sleeves together to fix the upper inspection well and the inspection well connecting pipe in this way;

[0015] S3, the cross bar is connected with the connecting piece by rotation, and multiple groups of cross bars are connected by ropes to form a ladder, and the pull rod of the upper limit block of the cross bar is pulled outward, the second spring is compressed, and the pull rod moves outward, and the folding rod of the ladder is rotated to be perpendicular to the cross bar. At this time, the limit column on the folding rod is inserted into the limit block through the opening, and the pull rod is released. Under the action of the second spring, the pull rod moves into the limit block until it passes through the perforation on the limit column, completing the limit of the folding rod;

[0016] S4. Press the pressure rods on both sides of the folding rod, the first spring is compressed, the pressure rod presses the first connecting rod and the second connecting rod, the insertion rod moves toward the inside of the folding rod under the linkage action of the first connecting rod and the second connecting rod, insert one end of the folding rod into the installation tube on the inner wall of the inspection well connecting pipe, release the pressure on the pressure rod, the first connecting rod and the second connecting rod move away from each other under the action of the first spring, drive the insertion rod to be inserted into the slot of the installation tube, perform this operation multiple times, install multiple cross bars on the inner wall of the inspection well connecting pipe, the ladder assembly is completed, and then the inspection well cover is assembled to the top of the upper inspection well through the lifting equipment.

[0017] The advantages and positive effects of the prefabricated inspection well and the manufacturing method thereof described in the present invention are:

[0018] 1. The present invention arranges inverted L-shaped grooves and L-shaped grooves on the upper inspection well, the inspection well connecting pipe, and the lower inspection well, plugs the inverted L-shaped grooves into the L-shaped grooves, and then fixes the inverted L-shaped grooves and the L-shaped grooves with bolts. The structure is simple, the installation is simple, the assembly process is simple, and the installation efficiency is improved.

[0019] 2. The present invention adopts a detachable ladder to increase the space in the inspection well, increase the activity space of the staff, and improve the work efficiency of the staff.

[0020] 3. The present invention makes the folding rod detachable by cooperating the insertion rod, the pressure rod, the first spring, the first connecting rod and the second connecting rod. By arranging a limit block on the inner side of the cross bar, arranging a limit column on the inner side of the folding rod, and limiting the limit column by a pull rod, the folding rod is limited, so that the folding rod cannot swing left and right when inserted into the installation tube, which is beneficial to improve the stability of the ladder during use.

[0021] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of a prefabricated inspection well structure of the present invention;

[0023] Figure 2 A schematic diagram of a ladder in a prefabricated inspection well of the present invention;

[0024] Figure 3 This is a schematic diagram of a connector in a prefabricated inspection well of the present invention;

[0025] Figure 4 A schematic diagram of a folding rod in a prefabricated inspection well of the present invention;

[0026] Figure 5 This is a schematic diagram of the connection between the folding rod and the installation pipe in a prefabricated assembly inspection well of the present invention;

[0027] Figure 6 A schematic diagram of the inner wall of a manhole connecting pipe in a prefabricated manhole of the present invention;

[0028] Figure 7 The present invention is a schematic top view of a cross bar in a prefabricated and assembled inspection well.

[0029] Reference numerals

[0030] 1. Inspection well cover; 2. Upper inspection well; 3. Inverted L-shaped groove; 4. Bolt; 5. Lower inspection well; 6. L-shaped groove; 7. Inspection well connecting pipe; 8. Connecting piece; 9. Cross bar; 10. Folding rod; 11. Connecting rope; 12. Upper pull ring; 13. Rotating ring; 14. Lower pull ring; 15. Installation groove; 16. Pressure rod; 17. Insert rod; 18. First connecting rod; 19. Second connecting rod; 20. Fixed rod; 21. First spring; 22. Installation pipe; 23. Slot; 24. Limit column; 25. Limit block; 26. Pull rod; 27. Second spring; 28. Guide tube. DETAILED DESCRIPTION

[0031] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0032] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0033] Example

[0034] like Figure 1 As shown, a prefabricated and assembled inspection well comprises an inspection well cover 1, an upper inspection well 2, an inspection well connecting pipe 7, and a lower inspection well 5. An upper inspection well 2, an inspection well connecting pipe 7, and a lower inspection well 5 are arranged in sequence below the inspection well cover 1. The upper inspection well 2 and the lower inspection well 5 are connected through the inspection well connecting pipe 7. The upper inspection well 2, the inspection well connecting pipe 7, and the lower inspection well 5 are plugged into each other. An inverted L-shaped groove 3 extending toward the inner wall of the upper inspection well 2 is arranged at the bottom of the upper inspection well 2, an L-shaped groove 6 extending toward the outer wall is arranged on the top inner wall of the inspection well connecting pipe 7, an inverted L-shaped groove 3 extending toward the inner wall of the inspection well connecting pipe 7 is arranged at the bottom of the inspection well connecting pipe 7, and an L-shaped groove 6 extending toward the outer wall is arranged on the top inner wall of the lower inspection well 5. The inverted L-shaped groove 3 is matched with the L-shaped groove 6, and the inverted L-shaped groove 3 is inserted into the L-shaped groove 6.

[0035] The L-shaped groove 6 is fixedly connected to the inverted L-shaped groove 3 by bolts 4. The bolts 4 penetrate the wall of the L-shaped groove 6 and extend into the wall of the inverted L-shaped groove 3. The walls of the L-shaped groove 6 and the inverted L-shaped groove 3 are both provided with threaded sleeves that match the bolts 4.

[0036] By setting the inverted L-shaped groove 3 and the L-shaped groove 6 on the upper inspection well 2, the inspection well connecting pipe 7, and the lower inspection well 5, plugging the inverted L-shaped groove 3 and the L-shaped groove 6, and then fixing the inverted L-shaped groove 3 and the L-shaped groove 6 with the bolt 4, the structure is simple, the installation is simple, the assembly process is simple, and the installation efficiency is improved. A rubber gasket is set in the joint where the inverted L-shaped groove 3 and the L-shaped groove 6 are plugged in to improve the sealing performance of the joint.

[0037] like Figure 2As shown, a detachable ladder is provided on the inner wall of the inspection well connecting pipe 7, and the ladder includes a plurality of climbing rods, a connecting rope 11, and a connecting piece 8. The plurality of climbing rods include a cross bar 9 and a folding rod 10. Adjacent cross bars 9 are connected by a connecting rope 11. A mounting pipe 22 is embedded in the inner wall of the inspection well connecting pipe 7, and the mounting pipe 22 corresponds to the folding rod 10 (as shown in FIG. Figure 6 as shown).

[0038] like Figure 4 As shown, both ends of the cross bar 9 are provided with mounting grooves 15, and one end of the mounting groove 15 is open to facilitate the rotation of the folding rod 10, and the rotation angle of the folding rod 10 and the cross bar 9 is 0-180 degrees. One end of the folding rod 10 is rotatably connected to the inside of the mounting groove 15 through a rotating shaft, and the other end is plugged into the mounting tube 22, and the two ends of the rotating shaft are rotatably connected to the inner wall of the mounting groove 15 respectively.

[0039] like Figure 5 As shown, a fixed rod 20 is transversely arranged at one end of the folding rod 10 away from the cross bar 9, and a first connecting rod 18 and a second connecting rod 19 are rotatably connected at the center of the fixed rod 20. The first connecting rod 18 and the second connecting rod 19 are cross-arranged on the fixed rod 20, and the first connecting rod 18 and the second connecting rod 19 are arranged close to the fixed rod 20. The first connecting rod 18 and the second connecting rod 19 can rotate around the fixed rod 20. The first connecting rod 18 and the second connecting rod 19 are both provided with a pressure rod 16 penetrating the inner wall of the folding rod 10 at one end close to the cross bar 9, and the first connecting rod 18 and the second connecting rod 19 are both provided with an insertion rod 17 penetrating the inner wall of the folding rod 10 at one end away from the cross bar 9. Through holes for the pressure rod 16 and the insertion rod 17 to move are respectively arranged on the inner wall of the folding rod 10. The first connecting rod 18 and the second connecting rod 19 are respectively connected at one end close to the cross bar 9 through a first spring 21, and a slot 23 corresponding to the insertion rod 17 is arranged on the inner wall of the mounting tube 22. The pressure rod 16 is pressed downward, the first spring 21 is compressed, the first connecting rod 18 and the second connecting rod 19 move in a direction close to each other, driving the corresponding insertion rod 17 to move inside the folding rod 10, and the folding rod 10 is inserted into the mounting tube 22 until the bottom of the folding rod 10 contacts the bottom of the mounting tube 22, and the pressure rod 16 is released. Under the action of the first spring 21, the first connecting rod 18 and the second connecting rod 19 move in a direction away from each other, driving the corresponding insertion rod 17 to move outside the folding rod 10, and the insertion rod 17 is inserted into the corresponding slot 23. At this time, the pressure rod 16 is located outside the mounting tube 22. When the folding rod 10 needs to be disassembled, the pressure rod 16 is pressed, the first spring 21 is compressed, the first connecting rod 18 and the second connecting rod 19 move in a direction close to each other, driving the corresponding insertion rod 17 to move inside the folding rod 10, and the insertion rod 17 is separated from the slot 23, and the folding rod 10 is pulled outward, and the folding rod 10 leaves the mounting tube 22.

[0040] like Figure 3As shown, both ends of the crossbar 9 are provided with connecting members 8, and the connecting members 8 include an upper pull ring 12, a lower pull ring 14, and a rotating ring 13. The upper pull ring 12 and the lower pull ring 14 are respectively located at the upper and lower ends of the rotating ring 13. The rotating ring 13 is sleeved on the outer wall of the crossbar 9. The crossbar 9 is rotatably connected with the rotating ring 13. One end of the connecting rope 11 is connected to the lower pull ring 14 of the connecting member 8 on the crossbar 9, and the other end is connected to the upper pull ring 12 of the connecting member 8 on the adjacent crossbar 9. Through the coordinated connection of the connecting rope 11, the connecting member 8, and the crossbar 9, a ladder with a certain length is formed.

[0041] like Figure 7 As shown, a limit block 25 is provided on the inner side of the cross bar 9, and the limit block 25 is hollow inside. A limit column 24 perpendicular to the folding rod 10 is provided on the inner side of the folding rod 10. The limit block 25 is opened on one side close to the limit column 24, and the limit column 24 enters the limit block 25 through the opening. A guide tube 28 is provided inside the end of the limit block 25 away from the cross bar 9, and a pull rod 26 is provided inside the guide tube 28. One end of the pull rod 26 passes through the inner wall of the limit block 25, and the other end passes through the guide tube 28 and extends to the outside of the wire tube. A second spring 27 is sleeved on the outside of the pull rod 26, and one end of the second spring 27 is fixedly connected to the inner wall of the limit block 25, and the other end is fixedly connected to the outer wall of the pull rod 26. The end of the limit column 24 located inside the limit block 25 is provided with a through hole for the pull rod 26 to pass through. By pulling the pull rod 26, the second spring 27 is compressed, the pull rod 26 moves outward, and the folding rod 10 is rotated to a position perpendicular to the cross bar 9. At this time, the limit column 24 extends into the limit block 25, and the pull rod 26 is released, and the second spring 27 is reset, driving the pull rod 26 to pass through the perforation on the limit column 24. The folding rod 10 is limited to prevent the folding rod 10 from shaking left and right when inserted into the mounting tube 22, thereby improving the stability of the ladder during use.

[0042] A method for manufacturing a prefabricated inspection well comprises the following steps:

[0043] S1. First, the manhole cover 1, the upper manhole 2, the manhole connecting pipe 7, and the lower manhole 5 are prefabricated by concrete slurry. When the upper manhole 2, the manhole connecting pipe 7, and the lower manhole 5 are prefabricated, an inverted L-shaped groove 3 and an L-shaped groove 6 are reserved at the assembly positions of the upper manhole 2, the manhole connecting pipe 7, and the lower manhole 5 according to the assembly requirements. Threaded sleeves are pre-embedded on the walls of the inverted L-shaped groove 3 and the L-shaped groove 6, respectively, and an installation pipe 22 is pre-embedded on the inner wall of the manhole connecting pipe 7;

[0044] S2, place the prefabricated lower inspection well 5 in the pre-dug foundation pit by hoisting equipment, and then align the inverted L-shaped groove 3 at the bottom of the inspection well connecting pipe 7 with the L-shaped groove 6 at the top of the lower inspection well 5 by hoisting equipment, and then thread the bolt 4 with the threaded sleeve, and fix the upper inspection well 2 with the inspection well connecting pipe 7 in this way;

[0045] S3, the cross bar 9 is rotated and connected with the connecting piece 8, and multiple groups of cross bars 9 are connected by the connecting rope 11 to form a ladder, and the pull rod 26 of the upper limit block 25 on the cross bar 9 is pulled outward, the second spring 27 is compressed, and the pull rod 26 moves outward, and the folding rod 10 of the ladder is rotated to be perpendicular to the cross bar 9. At this time, the limit column 24 on the folding rod 10 is inserted into the limit block 25 through the opening, and the pull rod 26 is released. Under the action of the second spring 27, the pull rod 26 moves into the limit block 25 until it passes through the perforation on the limit column 24, completing the limit of the folding rod 10;

[0046] S4. Press the pressure rod 16 on both sides of the folding rod 10, the first spring 21 is compressed, the pressure rod 16 presses the first connecting rod 18 and the second connecting rod 19, and the insertion rod 17 moves toward the inside of the folding rod 10 under the linkage action of the first connecting rod 18 and the second connecting rod 19, and inserts one end of the folding rod 10 into the installation tube 22 on the inner wall of the inspection well connecting pipe 7. Release the pressure on the pressure rod 16. Under the action of the first spring 21, the first connecting rod 18 and the second connecting rod 19 move away from each other, driving the insertion rod 17 to be inserted into the slot 23 of the installation tube 22. Repeat this operation many times, install multiple cross bars 9 on the inner wall of the inspection well connecting pipe 7, and the ladder assembly is completed. Then, the inspection well cover 1 is assembled to the top of the upper inspection well 2 through the lifting equipment.

[0047] When the staff needs to go down the well for inspection or cleaning, the staff opens the inspection well cover 1 through the lifting equipment, goes down to the bottom of the inspection well through the ladder, presses the pressure rod 16 on the folding rod 10, the first spring 21 is compressed, the first connecting rod 18 and the second connecting rod 19 move in the direction of approaching each other, and drives the corresponding plug rod 17 to move inside the folding rod 10, the plug rod 17 is disengaged from the slot 23, and the folding rod 10 is pulled outward, and the folding rod 10 leaves the installation tube 22. In this way, the ladder is disassembled, the operating space in the well is expanded, and the work efficiency is improved. After the work is completed, the ladder is installed on the inner wall of the inspection well connecting pipe 7 to facilitate the next work down the well.

[0048] Therefore, the present invention adopts the above-mentioned prefabricated assembled inspection well and its manufacturing method, which has a simple structure, a simple installation process, a high installation efficiency, a detachable ladder, increases the space in the inspection well, increases the activity space of the staff, and improves the work efficiency of the staff.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A prefabricated inspection well, comprising an inspection well cover, an upper inspection well, an inspection well connecting pipe, and a lower inspection well, characterized in that: An upper inspection well, an inspection well connecting pipe, and a lower inspection well are sequentially arranged below the inspection well cover. The upper inspection well and the lower inspection well are connected through the inspection well connecting pipe. The upper inspection well, the inspection well connecting pipe, and the lower inspection well are plugged into each other. A detachable ladder is arranged on the inner wall of the inspection well connecting pipe. The ladder includes a plurality of climbing poles, a connecting rope, and a connecting piece. The plurality of climbing poles include a cross bar and a folding pole. Adjacent cross bars are connected by a connecting rope. An installation pipe is embedded on the inner wall of the inspection well connecting pipe, and the installation pipe corresponds to the folding pole. The bottom of the upper inspection well is provided with an inverted L-shaped groove extending toward the inner wall of the upper inspection well, the top inner wall of the inspection well connecting pipe is provided with an L-shaped groove extending toward the outer wall, the bottom of the inspection well connecting pipe is provided with an inverted L-shaped groove extending toward the inner wall of the inspection well connecting pipe, and the top inner wall of the lower inspection well is provided with an L-shaped groove extending toward the outer wall, the inverted L-shaped groove is adapted to the L-shaped groove, and the inverted L-shaped groove is inserted into the L-shaped groove; The L-shaped groove and the inverted L-shaped groove are fixedly connected by bolts, the bolts penetrate the L-shaped groove wall and extend into the inverted L-shaped groove wall, and the L-shaped groove wall and the inverted L-shaped groove wall are both provided with threaded sleeves that match the bolts; Both ends of the cross bar are provided with mounting grooves, one end of the mounting groove is open, one end of the folding rod is rotatably connected to the inside of the mounting groove through a rotating shaft, and the other end is plugged into the mounting pipe, and both ends of the rotating shaft are rotatably connected to the inner wall of the mounting groove respectively; The end of the folding rod away from the cross rod is laterally provided with a fixing rod, and the first connecting rod and the second connecting rod are rotatably connected at the center of the fixing rod, the first connecting rod and the second connecting rod are cross-arranged on the fixing rod, the first connecting rod and the second connecting rod are closely arranged on the fixing rod, the ends of the first connecting rod and the second connecting rod close to the cross rod are provided with a pressure rod penetrating the inner wall of the folding rod, the ends of the first connecting rod and the second connecting rod away from the cross rod are provided with an insertion rod penetrating the inner wall of the folding rod, the inner wall of the folding rod is respectively provided with through holes for the pressure rod and the insertion rod to move, the ends of the first connecting rod and the second connecting rod close to the cross rod are respectively connected by a first spring, and the inner wall of the mounting tube is provided with a slot corresponding to the insertion rod; A limit block is provided on the inner side of the cross bar, and the limit block is hollow inside. A limit column perpendicular to the folding rod is provided on the inner side of the folding rod. The limit block is provided with an opening on one side close to the limit column, and the limit column enters the limit block through the opening. A guide tube is provided inside the end of the limit block away from the cross bar, and a pull rod is provided inside the guide tube. One end of the pull rod passes through the inner wall of the limit block, and the other end passes through the guide tube and extends to the outside of the wire tube. A second spring is sleeved on the outside of the pull rod, and one end of the second spring is fixedly connected to the inner wall of the limit block, and the other end of the second spring is fixedly connected to the outer wall of the pull rod. One end of the limit column located inside the limit block is provided with a through hole for the pull rod to pass through. A method for manufacturing a prefabricated inspection well comprises the following steps: S1. First, the manhole cover, upper manhole, manhole connecting pipe and lower manhole are prefabricated with concrete slurry. When prefabricating the upper manhole, manhole connecting pipe and lower manhole, an inverted L-shaped groove and an L-shaped groove are reserved at the assembly positions of the upper manhole, manhole connecting pipe and lower manhole according to the assembly requirements. Threaded sleeves are pre-embedded on the inverted L-shaped groove wall and the L-shaped groove wall respectively, and an installation pipe is pre-embedded on the inner wall of the manhole connecting pipe; S2. Place the prefabricated lower inspection well in the pre-dug foundation pit by hoisting equipment, and then align the inverted L-shaped groove at the bottom of the inspection well connecting pipe with the L-shaped groove at the top of the lower inspection well by hoisting equipment, and then thread the bolts and threaded sleeves together to fix the upper inspection well and the inspection well connecting pipe in this way; S3, the cross bar is connected with the connecting piece by rotation, and multiple groups of cross bars are connected by ropes to form a ladder, and the pull rod of the upper limit block of the cross bar is pulled outward, the second spring is compressed, and the pull rod moves outward, and the folding rod of the ladder is rotated to be perpendicular to the cross bar. At this time, the limit column on the folding rod is inserted into the limit block through the opening, and the pull rod is released. Under the action of the second spring, the pull rod moves into the limit block until it passes through the perforation on the limit column, completing the limit of the folding rod; S4. Press the pressure rods on both sides of the folding rod, the first spring is compressed, the pressure rod presses the first connecting rod and the second connecting rod, the insertion rod moves toward the inside of the folding rod under the linkage action of the first connecting rod and the second connecting rod, insert one end of the folding rod into the installation tube on the inner wall of the inspection well connecting pipe, release the pressure on the pressure rod, the first connecting rod and the second connecting rod move away from each other under the action of the first spring, drive the insertion rod to be inserted into the slot of the installation tube, perform this operation multiple times, install multiple cross bars on the inner wall of the inspection well connecting pipe, the ladder assembly is completed, and then the inspection well cover is assembled to the top of the upper inspection well through the lifting equipment.

2. The prefabricated inspection well according to claim 1, characterized in that: Both ends of the cross bar are provided with connecting parts, and the connecting parts include an upper pull ring, a lower pull ring, and a rotating ring. The upper pull ring and the lower pull ring are respectively located at the upper and lower ends of the rotating ring. The rotating ring is sleeved on the outer wall of the cross bar, and the cross bar is rotatably connected to the rotating ring. One end of the connecting rope is connected to the lower pull ring of the connecting part on the cross bar, and the other end thereof is connected to the upper pull ring of the connecting part on the adjacent cross bar.

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