A fully assembled post-core-filled column inspection pit structure and construction method

Abstract

The present invention discloses a fully assembled post-casting column inspection pit structure and construction method, comprising a foundation structure and a plurality of inspection pit assemblies, wherein the plurality of inspection pit assemblies are sequentially connected and fixed to the foundation structure, the inspection pit assemblies comprising a prefabricated base plate, a prefabricated hollow column and a plurality of prefabricated retaining walls, a plurality of column bottom connection grooves are provided on the prefabricated base plate, one end of the plurality of prefabricated hollow columns are inserted into the column bottom connection grooves in a one-to-one correspondence, and are connected to the prefabricated base plate by pouring concrete, and the plurality of prefabricated retaining walls are fixedly mounted on the side walls of the prefabricated hollow columns. The beneficial effect of the present invention is that the construction is carried out in a formwork-free manner of prefabrication followed by casting, and an allowable error range for installation is designed, thereby reducing the construction accuracy requirements of the assembled column inspection pit, making the construction of the track system more convenient and quick, and effectively solving the problem of large wet work volume of the traditional cast-in-place column inspection pit and high construction accuracy requirements of the assembled column inspection pit currently on the market.

Description

Technical Field

[0001] The invention belongs to the field of train maintenance facilities, and in particular relates to a fully assembled and core-filled columnar inspection pit structure and a construction method. Background Art

[0002] Inspection pits are essential train maintenance facilities in urban rail transit yards. Pillared inspection pits are the most widely used. Currently, in the domestic rail transit sector, these inspection pits, used for the maintenance of high-speed trains and subway trains, are mostly cast-in-place. While these methods offer advantages such as a mature and simple construction process and relatively good integrity, their disadvantages include extensive on-site wet work, severe pollution, long construction periods, low efficiency, poor construction precision, and rough, unsightly components.

[0003] Therefore, we need to design a fully assembled and core-filled column inspection pit structure and construction method to solve these problems. Summary of the Invention

[0004] The problem to be solved by the present invention is to provide a fully assembled and cored column inspection pit structure and a construction method.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A fully assembled post-core-filled columnar inspection pit structure and construction method includes a foundation structure and several inspection pit assemblies, wherein the several inspection pit assemblies are sequentially connected and fixed to the foundation structure, the inspection pit assemblies include a prefabricated base plate, prefabricated hollow columns and several prefabricated retaining walls, several column bottom connecting grooves are provided on the prefabricated base plate, steel bar sleeves are fixedly provided in the column bottom connecting grooves, one end of several prefabricated hollow columns are inserted into the column bottom connecting grooves in a one-to-one correspondence, and are connected to the prefabricated base plate by pouring concrete, and several prefabricated retaining walls are fixedly installed on the side walls of the prefabricated hollow columns.

[0007] Preferably, a column core connecting rib is further provided in the prefabricated hollow column, one end of the column core connecting rib is fixedly connected to the prefabricated bottom plate through the steel sleeve, and column core concrete is poured into the prefabricated hollow column.

[0008] Such an arrangement not only realizes the fixed connection between the prefabricated hollow column and the prefabricated base plate, but also improves the strength of the hollow column.

[0009] Preferably, the foundation structure includes foundation treatment piles, a cushion layer is fixedly arranged on top of the foundation treatment piles, and the prefabricated base plate is fixedly arranged on the cushion layer through a cement mortar layer.

[0010] Such an arrangement improves the bearing capacity of the foundation, and the cushion layer can prevent the foundation from being unevenly stressed due to geological reasons.

[0011] Preferably, a connecting key is fixedly provided at one end of the prefabricated base plate, and a keyway is provided at the other end, the connecting key matches the keyway, and several inspection pit assemblies are connected to the keyway in sequence through the connecting key.

[0012] Such an arrangement facilitates the interconnection between the inspection pit components and ensures the integrity of the inspection pit.

[0013] Preferably, a drainage ditch is provided in the middle of the prefabricated base plate along the extension direction of the prefabricated base plate, and a plurality of the column bottom connecting grooves are symmetrically and evenly distributed along the drainage ditch.

[0014] This arrangement is not affected by the reserved steel bars in the column base connection, making it easier to transport and stack the prefabricated base plate.

[0015] Preferably, the bottom surface size of the column bottom connecting groove is larger than the cross-sectional size of the prefabricated hollow column, a prefabricated concrete wedge is provided at the connection between the prefabricated hollow column and the column bottom connecting groove, and column bottom concrete is poured between the prefabricated hollow column and the column bottom connecting groove.

[0016] Such an arrangement enables the prefabricated hollow column to move within the column bottom connection groove, thereby improving installation accuracy and enhancing the shear resistance of the prefabricated hollow column.

[0017] Preferably, a bolt sleeve is embedded in the outer wall of the prefabricated hollow column, and a bolt hole is reserved on the prefabricated retaining wall. Each prefabricated retaining wall is fixedly installed on two adjacent prefabricated hollow columns on the same side of the drainage ditch by installing bolts that cooperate with the bolt holes and the bolt sleeves.

[0018] Such an arrangement can prevent the surrounding soil from entering the inspection pit, thereby affecting the normal use of the inspection pit.

[0019] Preferably, the joint between two adjacent prefabricated retaining walls, the joint between the prefabricated retaining wall and the prefabricated base plate, and each of the bolt holes are filled with sealing concrete.

[0020] Such an arrangement achieves sealing at the joints, can prevent water seepage in the inspection pit, and at the same time prevents the connecting parts from being corroded, thereby extending the service life of the inspection pit.

[0021] A construction method for a fully assembled post-core-filled column inspection pit structure, characterized by comprising the following steps:

[0022] Step 1: excavate the foundation, drive foundation treatment piles into the excavated foundation ground, and construct the cushion layer on top of the foundation treatment piles, while ensuring that the elevation of the foundation treatment pile top and the cushion layer top surface elevation meet the construction requirements;

[0023] Step 2: Lay a cement mortar layer on the cushion layer, and before the cement mortar layer begins to set, hoist the prefabricated base plate onto the cement mortar layer, and ensure that the installation axis and top surface elevation of the prefabricated base plate meet the construction standards;

[0024] Step 3: Install the column core connecting ribs to the prefabricated base plate through threaded sleeves, then hoist the prefabricated hollow column so that the column core connecting ribs are inserted into the prefabricated hollow column. At the same time, the column base of the prefabricated hollow column is inserted into the column base connecting groove, and four prefabricated concrete wedges are inserted into the column base of the prefabricated hollow column. After adjusting the column top elevation, longitudinal and transverse installation dimensions, pour the column base concrete to fix it;

[0025] Step 4: Install the rails and fastener system on the top of the prefabricated hollow column. After adjusting the position and elevation of the rails, pour the core concrete from the top of the column to reinforce it. Install the prefabricated retaining wall on the side wall of the prefabricated hollow column. At the same time, seal the joints and the installation of the fixings with sealing concrete. Finally, backfill and cover the soil.

[0026] Preferably, the allowable error of the top elevation of the foundation treatment pile is ±200mm, and the allowable error of the top surface elevation of the mattress layer is -40mm and +50mm; the laying thickness of the cement mortar layer is 30mm, the allowable deviation of the axis of the prefabricated base plate is ≤15mm, and the allowable error of the top surface elevation of the prefabricated base plate is ±50mm; a 20mm gap is reserved between the side wall of the column bottom connecting groove and the side wall of the prefabricated hollow column, and the height of the prefabricated concrete wedge is 20mm.

[0027] This arrangement reduces the construction accuracy requirements of the prefabricated column inspection pit, making the construction of the track system more convenient and faster.

[0028] The advantages and positive effects of the present invention are:

[0029] 1. The present invention effectively achieves a close fit between the flat bottom surface of the prefabricated base plate and the uneven top surface of the mattress layer through the cement mortar layer, which can ensure the uniformity and stability of force transmission; at the same time, the prefabricated concrete wedge blocks ensure the precise spatial positioning and reliable support of the prefabricated hollow columns.

[0030] 2 The present invention is assembled as a whole through prefabricated parts, and the connecting parts are poured with concrete, which reduces the amount of cast-in-place construction at the construction site, shortens the construction period, and reduces the pollution caused by wet operations on site.

[0031] 3 The present invention seals the construction joint of the retaining wall by sealing concrete, thereby ensuring the sealing of the inspection pit and preventing water seepage and accumulation. It can also block the contact between the connecting parts and the external water and soil environment, improve their anti-corrosion performance and extend their service life.

[0032] 4 The present invention is constructed by prefabrication followed by pouring, and the installation error range is designed, which reduces the construction accuracy requirements of the assembled column inspection pit, making the track system construction more convenient and quick, and effectively solves the problems of large wet work volume of traditional cast-in-place column inspection pits and high construction accuracy requirements of assembled column inspection pits currently on the market. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 It is a schematic diagram of the planar structure of the prefabricated base plate;

[0035] Figure 2 It is along Figure 1 Schematic diagram of the longitudinal section at point II;

[0036] Figure 3 It is along Figure 1 Schematic diagram of the transverse section at II-II;

[0037] Figure 4 It is a schematic diagram of the longitudinal section of a prefabricated hollow column;

[0038] Figure 5 It is a schematic diagram of the prefabricated retaining wall structure;

[0039] Figure 6 It is a schematic diagram of the structure of foundation treatment piles, cushion layer and cement mortar layer;

[0040] Figure 7 This is a schematic diagram of the cross section after the prefabricated base plate and column core connecting reinforcement are installed;

[0041] Figure 8 This is a schematic diagram of the cross section of the prefabricated hollow column after installation;

[0042] Figure 9 It is a schematic diagram of the cross section after the bottom concrete is poured;

[0043] Figure 10 This is a schematic diagram of the cross section after the rail and the sill system are installed and the column core concrete is poured;

[0044] Figure 11 This is a schematic diagram of the cross section of the prefabricated retaining wall after installation;

[0045] Figure 12 It is a schematic diagram of the cross section after sealing concrete filling;

[0046] Figure 13 It is a schematic diagram of the overall structure after the prefabricated retaining wall and sealed concrete construction are completed;

[0047] Figure 14 It is along Figure 13 Schematic diagram of the horizontal cross section at III-III in FIG.

[0048] Figure 15 yes Figure 11 A magnified view of the structure at point A;

[0049] Figure 16 yes Figure 14 A magnified view of the structure at point B in FIG.

[0050] The following are the descriptions of the reference numerals:

[0051] 1. Foundation treatment piles; 2. Cushion layer; 3. Cement mortar layer; 4. Precast base plate; 5. Column base connection groove; 6. Steel sleeve; 7. Drainage ditch; 8. Connection key; 9. Keyway; 10. Column core connection reinforcement; 11. Precast hollow column; 12. Steel skeleton; 13. Bolt sleeve; 14. Precast concrete wedge; 15. Column base concrete; 16. Rail and fastener system; 17. Column core concrete; 18. Precast retaining wall; 19. Bolt hole; 20. Mounting bolt; 21. Sealing concrete. DETAILED DESCRIPTION

[0052] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0053] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0054] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology, and the circuit connection adopts the conventional connection method in the existing technology, which will not be described in detail here.

[0055] The present invention will be further described below in conjunction with the accompanying drawings:

[0056] Example 1

[0057] like Figures 1-16 As shown, a fully assembled post-core-filled columnar inspection pit structure and construction method include a foundation structure and several inspection pit assemblies, which are sequentially connected and fixed to the foundation structure. The inspection pit assembly includes a prefabricated base plate 4, prefabricated hollow columns 11 and several prefabricated retaining walls 18. Several column bottom connecting grooves 5 are provided on the prefabricated base plate 4, and steel sleeves 6 are fixedly provided in the column bottom connecting grooves 5. One ends of several prefabricated hollow columns 11 are inserted into the column bottom connecting grooves 5 in a one-to-one correspondence, and are connected to the prefabricated base plate 4 by pouring concrete. Several prefabricated retaining walls 18 are fixedly installed on the side walls of the prefabricated hollow columns 11.

[0058] Specifically, a column core connecting rib 10 is provided in the prefabricated hollow column 11, and one end of the column core connecting rib 10 is fixedly connected to the prefabricated base plate 4 through a steel sleeve 6. Column core concrete 17 is poured into the prefabricated hollow column 11. This arrangement not only achieves a fixed connection between the prefabricated hollow column 11 and the prefabricated base plate 4, but also improves the strength of the prefabricated hollow column 11.

[0059] Specifically, the foundation structure includes a foundation treatment pile 1, a cushion layer 2 is fixedly arranged on the top of the foundation treatment pile 1, and a prefabricated base plate 4 is fixedly arranged on the cushion layer 2 through a cement mortar layer 3. Such a setting improves the bearing capacity of the foundation, and the cushion layer 2 can prevent the foundation from being unevenly stressed due to geological reasons.

[0060] Specifically, a connecting key 8 is fixedly provided at one end of the prefabricated base plate 4, and a key slot 9 is provided at the other end. The connecting key 8 matches the key slot 9. Several inspection pit components are connected in sequence through the connecting key 8 and the key slot 9. This arrangement facilitates the mutual connection between the inspection pit components and ensures the integrity of the inspection pit.

[0061] Specifically, a drainage ditch 7 is provided in the middle of the prefabricated base plate 4 along the extension direction of the prefabricated base plate 4, and a number of column bottom connecting grooves 5 are symmetrically and evenly distributed along the drainage ditch 7. Such an arrangement is not affected by the reserved steel bars in the column bottom connecting groove 5, and is convenient for transportation and stacking of the prefabricated base plate 4.

[0062] Furthermore, the bottom surface size of the column bottom connecting groove 5 is larger than the cross-sectional size of the prefabricated hollow column 11, and a prefabricated concrete wedge 14 is provided at the connection between the prefabricated hollow column 11 and the column bottom connecting groove 5, and column bottom concrete 15 is poured between the prefabricated hollow column 11 and the column bottom connecting groove 5. Such an arrangement enables the prefabricated hollow column 11 to move in the column bottom connecting groove 5, thereby improving the installation accuracy and enhancing the shear resistance of the prefabricated hollow column.

[0063] Furthermore, a bolt sleeve 13 is embedded in the outer wall of the prefabricated hollow column 11, and a bolt hole 19 is reserved on the prefabricated retaining wall 18. Each prefabricated retaining wall 18 is fixedly installed on two adjacent prefabricated hollow columns 11 on the same side of the drainage ditch 7 by installing bolts 20, bolt holes 19 and bolt sleeves 13. This arrangement can prevent the surrounding soil from entering the inspection pit, thereby affecting the normal use of the inspection pit.

[0064] Among them, the joints between two adjacent prefabricated retaining walls 18, the joints between the prefabricated retaining wall 18 and the prefabricated base plate 4, and each bolt hole 19 are filled with sealing concrete 21. This setting realizes the sealing of the joints, can prevent water seepage in the inspection pit, and prevent the connecting parts from being corroded, thereby extending the service life of the inspection pit.

[0065] The working process of this embodiment:

[0066] First, a foundation treatment pile 1 is driven into the ground at the construction site. The top elevation of the foundation treatment pile 1 is allowed to be controlled within the construction error range of ±200mm. After the construction of the foundation treatment pile 1 is completed, the cushion layer 2 is constructed on the top of the pile. The laying thickness of the cushion layer 2 is 350mm, and the top elevation is allowed to be controlled within the construction error range of -40mm and +50mm.

[0067] Then, a 30mm thick cement mortar layer 3 is laid on the cushion layer 2. Before the cement mortar layer 3 initially sets, a prefabricated base plate 4 is lifted by mechanical equipment and placed on the cement mortar layer 3. At the same time, the allowable deviation of the axis of the prefabricated base plate 4 is ensured to be ≤15mm, and the allowable deviation of the top surface elevation of the prefabricated base plate 4 is within ±50mm.

[0068] like Figure 4 The prefabricated connecting column shown is prefabricated by pouring concrete on the steel frame 12. The prefabricated hollow column 11 made in this way has high mechanical strength and strong compressive resistance. Then the column core connecting rib 10 is installed on the prefabricated base plate 4 through the steel sleeve 6, and then the prefabricated hollow column 11 is hoisted by mechanical equipment. During the hoisting process, it is necessary to ensure that the free end of the column core connecting rib 10 is inserted into the prefabricated hollow column 11 through one end of the prefabricated hollow column 11, and at the same time, it is also necessary to ensure that the column bottom of the prefabricated hollow column 11 extends into the column bottom connecting groove 5 of the prefabricated base plate 4. Since the bottom surface size of the column bottom connecting groove 5 is larger than the cross-sectional size of the prefabricated hollow column 11, the prefabricated hollow column 11 has a certain adjustment amount in the column bottom connecting groove 5, which is convenient for According to the installation accuracy requirements of the rail and fastener system 16, the prefabricated hollow column 11 is adjusted along the line, perpendicular to the line and vertically, and the inner hole diameter of the prefabricated hollow column 11 is 320mm. The rail and fastener system 16 can be adjusted along the extension direction of the prefabricated base plate 4 with a maximum adjustment amount of ±20mm and perpendicular to the extension direction of the prefabricated base plate 4 with a maximum adjustment amount of ±20mm. Four prefabricated concrete wedges 14 are also inserted at the connection between the column and the column bottom connecting groove 5 of each prefabricated hollow column 11 to ensure that the prefabricated hollow column 11 is accurately positioned and reliably supported by the prefabricated base plate 4. Then, the column bottom concrete 15 is poured into the gap between the column bottom connecting groove 5 and the prefabricated hollow column 11, vibrated to compact it and carried out regular maintenance.

[0069] Subsequently, when the column base concrete 15 reaches the design strength, the track and fastener system are installed on the top of the precast hollow column 11. During installation, the position and elevation of the rails must be accurate. Then, the column core concrete 17 is poured into the precast hollow column 11 from the top. A vibrating rod is used to vibrate the side wall of the precast hollow column 11 to ensure that the column core concrete 17 is poured densely, and regular maintenance is carried out.

[0070] Finally, a prefabricated retaining wall 18 is installed on two adjacent prefabricated hollow columns 11 on the same side of the drainage ditch 7. The bolt holes 19 on the retaining wall are elliptical, which can meet the purpose of adjusting the prefabricated retaining wall 18 along the extension direction of the prefabricated base plate 4 with a maximum adjustment amount of ±40mm. During installation, one end of the installation bolt 20 is passed through the bolt hole 19 and screwed into the bolt sleeve 13 embedded on the side wall of the prefabricated hollow column 11 to fix the prefabricated retaining wall 18. After all the prefabricated retaining walls 18 are fixed, the joints between the two adjacent prefabricated retaining walls 18, the joints between each prefabricated retaining wall 18 and the prefabricated base plate 4, and the bolt holes 19 on each prefabricated retaining wall 18 are filled with sealing concrete 21. After filling, wait for the sealing concrete 21 to solidify before backfilling and compacting the space between the prefabricated retaining wall 18 and the foundation pit.

[0071] The sealing concrete 21 , the column base concrete 15 and the column core concrete 17 are all made of fine stone concrete with good compactness.

[0072] The above is a detailed description of an embodiment of the present invention. However, the content described is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A construction method for a fully assembled post-core-filled columnar inspection pit structure, the fully assembled post-core-filled columnar inspection pit structure comprising: A foundation structure and a plurality of inspection pit assemblies, wherein the plurality of inspection pit assemblies are sequentially connected and fixed on the foundation structure, and are characterized in that: the inspection pit assembly comprises a prefabricated base plate (4), a prefabricated hollow column (11) and a plurality of prefabricated retaining walls (18); a plurality of column bottom connection grooves (5) are provided on the prefabricated base plate (4); a steel sleeve (6) is fixedly provided in the column bottom connection groove (5); one end of the plurality of prefabricated hollow columns (11) is inserted into the column bottom connection groove (5) in a one-to-one correspondence, and is connected to the prefabricated base plate (4) by pouring concrete; and the plurality of prefabricated retaining walls (18) are fixedly installed on the side walls of the prefabricated hollow column (11); A bolt sleeve (13) is embedded in the outer wall of the prefabricated hollow column (11), and a bolt hole (19) is reserved on the prefabricated retaining wall (18). Each prefabricated retaining wall (18) is fixedly mounted on two adjacent prefabricated hollow columns (11) on the same side of the drainage ditch (7) by means of a mounting bolt (20) that cooperates with the bolt hole (19) and the bolt sleeve (13); The construction method comprises the following steps: Step 1: Drive foundation treatment piles into the ground and construct a cushion layer on top of the foundation treatment piles, while ensuring that the elevation of the top of the foundation treatment piles and the top surface elevation of the cushion layer meet the construction requirements; Step 2: Lay a cement mortar layer on the cushion layer, and before the cement mortar layer begins to set, hoist the prefabricated base plate onto the cement mortar layer, and ensure that the installation axis and top surface elevation of the prefabricated base plate meet the construction standards; Step 3: Install the column core connecting ribs to the prefabricated base plate through threaded sleeves, then hoist the prefabricated hollow column so that the column core connecting ribs are inserted into the prefabricated hollow column. At the same time, the column base of the prefabricated hollow column is inserted into the column base connecting groove, and four prefabricated concrete wedges are inserted into the column base of the prefabricated hollow column. After adjusting the column top elevation, longitudinal and transverse installation dimensions, pour the column base concrete to fix it; Step 4: Install the rails and fastener system at the top of the prefabricated hollow column. After adjusting the position and elevation of the rails, pour the core concrete from the top of the column for reinforcement. Install the prefabricated retaining wall on the side wall of the prefabricated hollow column. At the same time, use sealing concrete to seal the joints and the fixing installation points, and finally backfill with soil.

2. The construction method of a fully assembled post-core-filled column inspection pit structure according to claim 1, characterized in that: A column core connecting rib (10) is also provided in the prefabricated hollow column (11), one end of the column core connecting rib (10) is fixedly connected to the prefabricated bottom plate (4) through the steel sleeve (6), and column core concrete (17) is poured into the prefabricated hollow column (11).

3. The construction method of a fully assembled post-core-filled column inspection pit structure according to claim 1, characterized in that: The foundation structure comprises a foundation treatment pile (1), a cushion layer (2) is fixedly arranged on the top of the foundation treatment pile (1), and the prefabricated base plate (4) is fixedly arranged on the cushion layer (2) via a cement mortar layer (3).

4. The construction method of a fully assembled post-core-filled column inspection pit structure according to claim 1 is characterized in that: A connecting key (8) is fixedly provided at one end of the prefabricated base plate (4), and a keyway (9) is provided at the other end. The connecting key (8) matches the keyway (9), and a plurality of inspection pit assemblies are sequentially connected to the keyway (9) via the connecting key (8).

5. The construction method of a fully assembled post-core-filled column inspection pit structure according to claim 1 is characterized in that: A drainage ditch (7) is provided in the middle of the prefabricated base plate (4) along the extension direction of the prefabricated base plate (4), and a plurality of column bottom connection grooves (5) are symmetrically and evenly distributed along the drainage ditch (7).

6. The construction method of a fully assembled post-core-filled column inspection pit structure according to claim 1, characterized in that: The bottom surface size of the column bottom connecting groove (5) is larger than the cross-sectional size of the prefabricated hollow column (11); a prefabricated concrete wedge (14) is provided at the connection between the prefabricated hollow column (11) and the column bottom connecting groove (5); and column bottom concrete (15) is poured between the prefabricated hollow column (11) and the column bottom connecting groove (5).

7. The construction method of a fully assembled post-core-filled column inspection pit structure according to claim 1, characterized in that: Sealing concrete (21) is filled in the joints between two adjacent prefabricated retaining walls (18), the joints between the prefabricated retaining wall (18) and the prefabricated base plate (4), and each bolt hole (19).

8. The construction method of a fully assembled post-core-filled column inspection pit structure according to claim 1, characterized in that: The allowable error of the top elevation of the foundation treatment piles is ±200mm, and the allowable error of the top surface elevation of the cushion layer is -40mm and +50mm; the laying thickness of the cement mortar layer is 30mm, the allowable deviation of the axis of the prefabricated base plate is ≤15mm, and the allowable error of the top surface elevation of the prefabricated base plate is ±50mm; a 20mm gap is reserved between the side wall of the column bottom connecting groove and the side wall of the prefabricated hollow column, and the height of the prefabricated concrete wedge is 20mm.

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