Bamboo joint type prefabricated well neck and construction method

Abstract

The invention discloses a bamboo joint type prefabricated well neck and a construction method, belongs to the field of road catch basin construction, and aims to accelerate the construction progress and improve the construction quality. Comprising a prefabricated well neck ring; the bottom supporting plate is sleeved at the bottom of the well neck ring; the head sealing plate is sleeved on the top of the well neck ring; large bamboo joint stiffened plates are uniformly distributed along the axial direction of the well neck ring; and small bamboo joint stiffened plates are uniformly distributed between the bottommost large bamboo joint stiffened plate and the bottom supporting plate, between the uppermost large bamboo joint stiffened plate and the end sealing plate and between the adjacent large bamboo joint stiffened plates. According to the structure, the burial depth of the prefabricated well and the length of the prefabricated well neck can be adjusted according to the road drainage gradient requirement, the construction period is shortened, and the quality problem of splicing seams is avoided due to the overall prefabricated structure of the full-length cylindrical well neck and the segmented bamboo joint plates. The bamboo joint stiffened plates reinforce the lateral rigidity of the well neck ring and prevent the well neck ring from deforming in the backfilling and compacting process; and moreover, the backfill is fully engaged with the backfill, and the reasonably arranged large bamboo joint stiffened plates and small bamboo joint stiffened plates form an uneven stubble-like structure to improve the engagement strength and the supporting strength.

Description

Technical Field

[0001] The invention belongs to the technical field of road rainwater well construction, and specifically relates to a bamboo-joint prefabricated well neck and a construction method. Background Art

[0002] When constructing the underground drainage system of a road traffic project, the road drainage pipe foundation trench and rainwater well foundation pit are usually excavated after the roadbed excavation and replacement rolling are completed, and after the construction of the roadbed water-stabilizing layer is completed. Due to the disturbance caused to the roadbed foundation after the secondary excavation, the backfill after the drainage system construction cannot be excessively layered and rolled to avoid quality problems such as pipeline damage, cracking and collapse of rainwater wells caused by extrusion transition. In addition, traditional rainwater well construction mostly adopts the type of brick masonry + plastering. Its construction process is too cumbersome, the construction cycle is long, and the construction quality is difficult to guarantee; then it gradually develops into a modular rainwater well, that is, first masonry hollow modules, and then the grouting method is used to fill the gap between the modules. This method has poor well wall strength and is prone to cracking and collapse when the roadbed is backfilled and compacted; therefore, finished prefabricated wells are usually used nowadays, and the construction progress is accelerated by simultaneous factory prefabrication and on-site foundation pit grooving, and the prefabricated reinforced concrete finished wells have high strength and good quality. Since the prefabrication of finished wells requires customized molds, the mold sizes are usually standard parameters. However, considering that the on-site rainwater system relies on gravity drainage, the buried depth of each rainwater well is different, and the sizes of the finished wells completed by modular processing are mostly the same, so after the on-site installation is completed, there is still a distance from the wellhead to the road surface, so a well neck needs to be added. The existing well neck of the concrete finished well is a prefabricated well neck, which has the following shortcomings:

[0003] First, the sizes of prefabricated well necks are mostly processed according to the modular dimensions of the project. There are still problems with matching during on-site construction and installation, and multiple splicing is often required. The on-site assembly work is too cumbersome, the labor and machinery costs are high, and there is also a risk of leakage at the joints.

[0004] Second, during road construction, the roadbed is first excavated and replaced with compacted, and then the underground drainage system trench and rainwater well foundation pit are excavated. Since the secondary excavation disturbs the roadbed, and the impact of the underground pipeline is considered after the drainage system is completed, it is not appropriate to use heavy rollers to compact the ground backfill, so as to avoid quality problems such as deformation and rupture of the pipeline and deformation and collapse of the rainwater well. Inadequate compaction will lead to quality risks such as foundation subsidence and road cracking, especially the roadbed in the backfill area near the rainwater well is soft and difficult to fully compact. The roadbed in the surrounding backfill area will collapse due to insufficient bearing capacity, that is, the roadbed construction quality is difficult to meet the requirements. Summary of the invention

[0005] The purpose of the invention is to provide a bamboo-joint prefabricated well neck and a construction method, which can accelerate the construction progress of the road rainwater well and at the same time well ensure the construction quality of the roadbed and the rainwater well.

[0006] The technical solution adopted by the present invention is: a bamboo-joint prefabricated well neck, comprising a prefabricated well neck ring and an annular bottom supporting plate, a large bamboo-joint stiffening plate, a small bamboo-joint stiffening plate and a head plate; the well neck ring is a cylinder whose bottom end is adapted to the wellhead of the prefabricated well and whose top end is adapted to the well cover; the bottom supporting plate is mounted on the bottom of the well neck ring, and the inner wall of the bottom supporting plate is fixedly connected to the outer wall of the well neck ring; the head plate is mounted on the top of the well neck ring, and the inner wall of the head plate is fixedly connected to the outer wall of the well neck ring; a plurality of the large bamboo-joint stiffening plates are evenly distributed between the bottom supporting plate and the head plate along the axial direction of the well neck ring, and the inner wall of the large bamboo-joint stiffening plates is fixedly connected to the outer wall of the well neck ring; a plurality of small bamboo-joint stiffening plates are evenly distributed between the lowest large bamboo-joint stiffening plate and the bottom supporting plate, between the highest large bamboo-joint stiffening plate and the head plate, and between two adjacent large bamboo-joint stiffening plates, and the inner wall of the small bamboo-joint stiffening plates is fixedly connected to the outer wall of the well neck ring.

[0007] Furthermore, a plurality of grouting pipes are evenly arranged around the well neck ring, and grouting holes are distributed on the side walls of the grouting pipes. The grouting pipes vertically pass through the head plate, the large bamboo joint stiffening plate and the bottom support plate in sequence.

[0008] Furthermore, the head plate is in the shape of a groove, and is surrounded by the folded edge at its outer end, the bottom wall and the outer wall of the well collar to form an annular groove with an open top for installing a prefabricated concrete well ring.

[0009] Furthermore, the bottom support plate is provided with mounting through holes.

[0010] Furthermore, the distance between two adjacent large bamboo-joint stiffening boards is equal to the thickness of the layered backfill layer, and the thickness of the layered backfill layer is 30 to 50 cm.

[0011] The well neck construction method comprises the following steps:

[0012] Step 1: After the finished prefabricated well is installed, fix the prefabricated bamboo-shaped prefabricated well neck to the top of the prefabricated well;

[0013] Step 2: backfill and compact the foundation pit in layers in the vicinity of the bamboo-jointed prefabricated well neck;

[0014] Step 3, injecting grout into the backfill layer through the grouting pipe;

[0015] Step 4: Install the prefabricated concrete well ring and cover the well cover;

[0016] Step 5: Construction of road surface layer.

[0017] Furthermore, in step one, the prefabricated well neck ring is inserted into the prefabricated well according to the construction drawing, the bottom support plate at the bottom of the well neck ring is clamped on the prefabricated wellhead pier, and the bottom support plate is fixed to the prefabricated wellhead pier by passing through the reserved holes on the bottom support plate with expansion bolts.

[0018] Furthermore, in step three, the pressure grouting catheter is first inserted into the bottom of the grouting pipe, and the top of the pressure grouting catheter is connected to the pressure grouting machine. The grouting fluid is pressed into the grouting pipe by the pressure grouting machine, and then infiltrated into the backfill soil through the plum blossom-shaped infiltration holes on the outer wall of the grouting pipe.

[0019] Furthermore, when the foundation soil in the backfill area near the well neck is relatively soft, a steel skeleton is set in the grouting pipe before step three.

[0020] Furthermore, in step four, the head plate is in the shape of a groove, and is surrounded by the folded edge at its outer end, the bottom wall and the outer wall of the well neck ring to form an annular groove with an open top. The prefabricated concrete well ring is installed in the annular groove, and a flexible material is used to seal the gap between the prefabricated concrete well ring and the annular groove; then, the well cover is placed on the prefabricated concrete well ring, and a flexible material is used to seal the gap between the prefabricated concrete well ring and the well cover.

[0021] The beneficial effects of the present invention are as follows: through the prefabricated finished well neck ring and the annular bamboo-joint stiffener structure distributed on its outer side wall, the installation and construction of prefabricated finished wells, well necks and ground well rings, well cover structures, etc. with various buried depths can be matched according to the slope requirements of the gravity drainage system. The overall prefabricated structure of the full-length cylindrical well neck and the annular segmented bamboo-joint plate can effectively solve the problems of long construction period and construction quality defects brought about by the traditional masonry well neck. At the same time, it can also solve the quality problems such as leakage caused by the mismatch between the module of the traditional concrete prefabricated well neck and the actual situation on site and the splicing seams.

[0022] The bamboo-joint stiffeners distributed on the outer wall of the well neck ring, on the one hand, play a good role in strengthening the lateral stiffness of the well neck ring and prevent the well neck ring from deforming due to its insufficient stiffness during the backfill compaction process; on the other hand, they can fully bite with the backfill soil, and reasonably set large and small bamboo-joint stiffeners according to the backfill compaction thickness, thus forming an uneven rib-like structure to improve the bite strength and support strength.

[0023] Grouting is carried out into the backfill soil through the grouting pipe that passes through the large bamboo joint stiffener on the outer periphery of the well neck ring. The slurry is pressed into the gaps in the backfill soil through the seepage holes of the grouting pipe, filling it densely and solidifying with the backfill soil to form a stable roadbed foundation, thus avoiding the problem of roadbed settlement and collapse due to insufficient bearing capacity of the roadbed foundation.

[0024] The well neck structure disclosed in the present invention has a well neck ring which is arranged through the long cylinder body, has no water seepage seams on the inner and outer side walls, and does not require waterproof mortar plastering on the inner and outer walls, thus simplifying the construction process. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is the cross-section diagram of the bamboo-jointed prefabricated well neck;

[0026] Figure 2 for Figure 1 AA section view;

[0027] Figure 3 Schematic diagram of grouting pipe.

[0028] In the figure, there are a prefabricated well 1, a wellhead pier 11, a bamboo-joint prefabricated well neck 2, a well neck ring 21, a bottom support plate 22, expansion bolts 221, a large bamboo-joint stiffening plate 23, a small bamboo-joint stiffening plate 24, a head plate 25, a grouting pipe 3, a grouting hole 31, a grouting conduit 32, a well cover 4, and a concrete prefabricated well ring 5. DETAILED DESCRIPTION

[0029] The present invention is further described below in conjunction with the accompanying drawings and embodiments:

[0030] The terms "top", "bottom", "inside", "outside" and the like used in the present invention to indicate directions are based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present invention, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0031] Bamboo prefabricated well neck, such as Figure 1 and Figure 2 As shown, it includes a well collar 21 and an annular bottom support plate 22, a large bamboo joint stiffening plate 23, a small bamboo joint stiffening plate 24 and a head plate 25; the well collar 21 is cylindrical, the bottom end of which is adapted to the wellhead of the prefabricated well 1, and the top end is adapted to the well cover 4; the bottom support plate 22 is sleeved on the bottom of the well collar 21, and the inner side wall of the bottom support plate 22 is fixedly connected to the outer side wall of the well collar 21; the head plate 25 is sleeved on the top of the well collar 21, and the inner side wall of the head plate 25 is fixedly connected to the outer side wall of the well collar 21; There are several large bamboo-joint reinforcement plates 23 evenly distributed along the axial direction of the well neck ring 21 between the bottom support plate 22 and the head plate 25, and the inner walls of the large bamboo-joint reinforcement plates 23 are fixedly connected to the outer walls of the well neck ring 21; there are several small bamboo-joint reinforcement plates 24 evenly distributed between the lowest large bamboo-joint reinforcement plate 23 and the bottom support plate 22, between the highest large bamboo-joint reinforcement plate 23 and the head plate 25, and between two adjacent large bamboo-joint reinforcement plates 23, and the inner walls of the small bamboo-joint reinforcement plates 24 are fixedly connected to the outer walls of the well neck ring 21.

[0032] The diameters of the large bamboo joint stiffening plate 23 and the small bamboo joint stiffening plate 24 are different, and the diameter of the large bamboo joint stiffening plate 23 is larger than that of the small bamboo joint stiffening plate 24. The large bamboo joint stiffening plate 23, the small bamboo joint stiffening plate 24, the bottom support plate 22 and the head plate 25 are all welded to the outer wall of the well neck ring 21. During production, the well neck ring 21 can be prefabricated and processed in advance according to the size of the wellhead and the manhole cover 4 of the prefabricated well 1. After being transported to the site, the positions and spacings of the large bamboo joint stiffening plate 23 and the small bamboo joint stiffening plate 24 are divided according to the depth of the upper well neck of different rainwater wells, and then welded to the well neck ring 21. The large bamboo joint stiffening plate 23, the small bamboo joint stiffening plate 24, the bottom support plate 22 and the head plate 25 are the main annular bamboo joint circles. The bottom support plate 22 mainly plays the role of supporting the entire well neck, and it is placed on the annular wellhead buttress 11 at the wellhead of the prefabricated well 1. The bottom support plate 22 is provided with installation through holes, which are used to insert expansion bolts 221 to fix the bottom support plate 22 and the wellhead pier 11, thereby fixing the well neck ring 21. The large bamboo joint stiffening plate 23 and the small bamboo joint stiffening plate 24 can, on the one hand, reinforce the well neck ring 21, improve its lateral rigidity, and prevent it from being squeezed and deformed; on the other hand, they can separate the backfill soil near the well neck ring 21, insert the backfill soil in this uneven length-like raft structure, and improve the bite force between the backfill soil. After grouting in the backfill layer, it can play a good role in stiffening the stiffening plate. The top head plate 25 mainly supports the prefabricated concrete well ring 5 and the manhole cover 4.

[0033] Through the prefabricated finished well neck ring 21 and the annular bamboo joint stiffener distributed on its outer wall, the burial depth of the prefabricated well and the length of the prefabricated well neck can be adjusted according to the road drainage slope requirements. The well neck ring 21 is set throughout the length to solve the problem of long construction period caused by traditional masonry well necks, and also to solve the quality problems caused by the mismatch between the module of the traditional concrete prefabricated well neck and the actual situation on site and the splicing seams.

[0034] The bamboo-joint stiffening plates distributed on the outer wall of the well neck ring 21, on the one hand, play a good role in reinforcing the lateral rigidity of the well neck ring 21, preventing the well neck ring 21 from being deformed due to its insufficient rigidity during the backfill compaction process; on the other hand, they can fully bite with the backfill soil, and the large bamboo-joint stiffening plates 23 and the small bamboo-joint stiffening plates 24 are reasonably arranged according to the backfill compaction thickness, thus forming an uneven rib-like structure to improve the bite strength and support strength.

[0035] A plurality of grouting pipes 3 are evenly arranged around the well collar 21, such as Figure 3As shown, the side wall of the grouting pipe 3 is provided with grouting holes 31, and the grouting pipe 3 passes through the head plate 25, the large bamboo joint stiffening plate 23 and the bottom support plate 22 in sequence along the vertical direction. The grouting pipe 3 is used to inject grout into the backfill layer. After the entire bamboo joint prefabricated well neck is installed in place, and the backfill soil is backfilled and lightly rolled in layers, the pressure grouting is started by the slurry squeezing method. The slurry is pressed into the gap of the backfill soil through the grouting holes 31 on the grouting pipe 3, and the slurry is filled densely and solidified with the backfill soil, thereby forming a stable roadbed foundation, avoiding the problems of roadbed settlement and collapse due to insufficient bearing capacity. The construction can be completed after the grouting is solidified. The operation method is simple and efficient, and there is no need to carry out waterproof mortar plastering on the inner and outer walls like the traditional method, which simplifies the construction process. The grouting pipe 3 passes through the large bamboo joint stiffening plate 23, and the grouting pipe 3 is radially supported and fixedly installed by the large bamboo joint stiffening plate 23 to prevent the problem of bending deformation or breakage due to excessive size.

[0036] The head plate 25 can also meet the requirements by using a flat plate. In this embodiment, as a preferred method, the head plate 25 is in the shape of a groove, and the folded edge of the outer end, the bottom wall and the outer wall of the well collar 21 form an annular groove with an open top for installing the concrete prefabricated well ring 5. The annular groove serves as a positioning groove for the concrete prefabricated well ring 5, which supports and positions the concrete prefabricated well ring 5. After the grouting is completed and reaches a certain strength, the concrete prefabricated well ring 5 is covered, and the well cover 4 is covered in time to prevent soil and other debris from falling into the rainwater well.

[0037] In view of the technical specifications for layered backfilling and layered rolling, the spacing between two adjacent large bamboo joint stiffening plates 23 is equal to the thickness of the layered backfill layer, and the thickness of the layered backfill layer is 30 to 50 cm to ensure that the backfill soil between adjacent bamboo joint plates is fully filled and fully interlocked with each layer of backfill soil.

[0038] The well neck construction method comprises the following steps:

[0039] Step 1: After the finished prefabricated well 1 is installed, the prefabricated bamboo-joint prefabricated well neck 2 is fixed to the top of the prefabricated well 1.

[0040] The specific operations of the finished prefabricated well 1 are: organize the layout, positioning and excavation of the rainwater well and pipeline according to the road rainwater drainage system, use the theodolite to verify the well bottom elevation, pour the concrete cushion layer, draw the positioning cross line, install the prefabricated finished prefabricated well 1, and complete the backfill and compaction of the foundation pit around the rainwater well.

[0041] The operation process of fixing the bamboo-joint prefabricated well neck 2 to the top of the prefabricated well 1 is as follows: insert the prefabricated well neck ring 21 into the prefabricated well 1 according to the construction drawings, and the bottom support plate 22 at the bottom of the well neck ring 21 is stuck on the prefabricated wellhead pier 11, and the bottom support plate 22 is fixed to the prefabricated wellhead pier 11 by passing through the reserved holes on the bottom support plate 22 with expansion bolts 221.

[0042] Among them, the positions of the annular large bamboo joint stiffening plates 23 and the small bamboo joint stiffening plates 24 are set according to the backfill compaction machinery and the layered rolling thickness. Usually, the spacing between the large bamboo joint stiffening plates 23 is the thickness of the layered backfill layer, usually 30 to 50 cm, and the spacing between the small bamboo joint stiffening plates 24 is usually about 10 cm, so as to form an uneven rib-like structure to improve the bite strength and support strength between the backfill soil.

[0043] The annular head plate 25 at the top of the well collar 21 should be positioned according to the elevation and thickness of the road surface, and the size and thickness of the prefabricated concrete well collar 5 should be reserved in order to accurately position it and facilitate quick installation after the grouting is completed.

[0044] Step 2: Backfill and compact the foundation pit in the vicinity of the bamboo-jointed prefabricated well neck in layers. Considering that the backfill soil may easily cause deformation of the bamboo-jointed prefabricated well neck 2, the thickness of the backfill and compaction should be controlled at about 30 cm, and a small manual compaction machine should be used.

[0045] Step three, grouting the backfill layer through the grouting pipe 3. The grouting process adopts pressure grouting, and the slurry can be made of high-strength and fluid grouting materials such as cement slurry + early strength agent mixture, water glass liquid or high-strength grouting material. First, insert the pressure grouting catheter 32 into the bottom of the grouting pipe 3, and the top of the pressure grouting catheter 32 is connected to the pressure grouting machine. The grouting fluid is pressed into the grouting pipe 3 by the pressure grouting machine, and then the grouting holes 31 distributed in the plum blossom shape on the outer wall of the grouting pipe 3 are infiltrated and filled into the backfill soil. During the grouting process, the liquid level in the grouting pipe 3 no longer drops and the pressure grouting machine is difficult to inject as the standard for judging the filling. When the foundation soil of the backfill area near the well neck ring 21 is soft, such as clay or silt soil, in order to provide the bearing capacity of the foundation, a steel skeleton is set in the grouting pipe 3 before grouting. After grouting, the steel skeleton forms a solidified structure with the grouting liquid and the backfill soil, and the bearing capacity of the foundation is improved.

[0046] Step 4: Install the prefabricated concrete well ring 5 and cover the well cover 4. After the slurry is fully filled and completely hardened with the backfill soil, and after curing to a certain strength, install the prefabricated concrete well ring 5 in the annular groove of the head plate 25. After the installation is completed, the gap between the head plate 25 and the prefabricated concrete well ring 5 is sealed with a flexible material; at the same time, the cast iron or prefabricated concrete well cover 4 is covered on the prefabricated concrete well ring 5, and the surrounding gaps are also sealed to prevent garbage and debris from being hoisted into the well.

[0047] Step 5: Construction of the road surface layer. During the construction of the road surface layer, a small-tonnage press can be used to roll the area around the wellhead to avoid excessive rolling and squeezing the well neck, which may cause the hole to collapse.

[0048] In the description of this specification, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Bamboo-joint prefabricated well neck, characterized by: The invention comprises a prefabricated well collar (21), an annular bottom support plate (22), a large bamboo joint stiffening plate (23), a small bamboo joint stiffening plate (24) and a head plate (25); the well collar (21) is a cylindrical body whose bottom end is adapted to the wellhead of the prefabricated well (1) and whose top end is adapted to the well cover (4); the bottom support plate (22) is mounted on the bottom of the well collar (21), and the inner side wall of the bottom support plate (22) is fixedly connected to the outer side wall of the well collar (21); the head plate (25) is mounted on the top of the well collar (21), and the inner side wall of the head plate (25) is fixedly connected to the outer side wall of the well collar (21). ; A plurality of large bamboo-joint reinforcing plates (23) are evenly distributed between the bottom supporting plate (22) and the end plate (25) along the axial direction of the well neck ring (21), and the inner side walls of the large bamboo-joint reinforcing plates (23) are fixedly connected to the outer side walls of the well neck ring (21); a plurality of small bamboo-joint reinforcing plates (24) are evenly distributed between the bottom large bamboo-joint reinforcing plate (23) and the bottom supporting plate (22), between the top large bamboo-joint reinforcing plate (23) and the end plate (25), and between two adjacent large bamboo-joint reinforcing plates (23), and the inner side walls of the small bamboo-joint reinforcing plates (24) are fixedly connected to the outer side walls of the well neck ring (21).

2. The bamboo-jointed prefabricated well neck according to claim 1, characterized in that: A plurality of grouting pipes (3) are evenly arranged around the well collar (21), and grouting holes (31) are distributed on the side walls of the grouting pipes (3). The grouting pipes (3) vertically pass through the head plate (25), the large bamboo joint stiffening plate (23) and the bottom support plate (22) in sequence.

3. The bamboo-jointed prefabricated well neck according to claim 1 or 2, characterized in that: The head plate (25) is in the shape of a groove, and is surrounded by the folded edge at the outer end, the bottom wall and the outer wall of the well collar (21) to form an annular groove with an open top for installing the concrete prefabricated well collar (5).

4. The bamboo-jointed prefabricated well neck according to claim 1 or 2, characterized in that: The bottom support plate (22) is provided with mounting through holes.

5. The bamboo-jointed prefabricated well neck according to claim 1 or 2, characterized in that: The distance between two adjacent large bamboo joint stiffening plates (23) is equal to the thickness of the layered backfill layer, and the thickness of the layered backfill layer is 30 to 50 cm.

6. The well neck construction method comprises the following steps: Step 1: After the finished prefabricated well is installed, the prefabricated bamboo-shaped prefabricated well neck (2) as described in claim 2 is fixed to the top of the prefabricated well (1); Step 2: backfill and compact the foundation pit in layers in the vicinity of the bamboo-jointed prefabricated well neck; Step 3, injecting grout into the backfill layer through the grouting pipe (3); Step 4: Install the prefabricated concrete well ring (5) and cover the well cover (4); Step 5: Construction of road surface layer.

7. The construction method of the bamboo-jointed prefabricated well neck according to claim 6, characterized in that: In step 1, the prefabricated well collar (21) is inserted into the prefabricated well (1) according to the construction drawing, the bottom support plate (22) at the bottom of the well collar (21) is clamped on the prefabricated wellhead buttress (11), and the bottom support plate (22) is fixed to the prefabricated wellhead buttress (11) by passing through the reserved holes on the bottom support plate (22) with expansion bolts (221).

8. The construction method of the bamboo-jointed prefabricated well neck according to claim 6, characterized in that: In step three, the pressure grouting conduit (32) is first inserted into the bottom of the grouting pipe (3), and the top of the pressure grouting conduit (32) is connected to the pressure grouting machine. The grouting fluid is pressed into the grouting pipe (3) by the pressure grouting machine, and then infiltrated into the backfill soil through the plum blossom-shaped infiltration holes (31) on the outer wall of the grouting pipe (3).

9. The construction method of the bamboo-jointed prefabricated well neck according to claim 8, characterized in that: When the foundation soil in the backfill area near the well neck ring (21) is relatively soft, before step 3, a steel reinforcement skeleton is arranged in the grouting pipe (3).

10. The construction method of the bamboo-jointed prefabricated well neck according to claim 6, characterized in that: In step 4, the head plate (25) is in the shape of a groove, and is surrounded by the folded edge at the outer end, the bottom wall and the outer wall of the well neck ring (21) to form an annular groove with an open top. The prefabricated concrete well ring (5) is installed in the annular groove, and a flexible material is used to seal the gap between the prefabricated concrete well ring (5) and the annular groove; then, the well cover (4) is covered on the prefabricated concrete well ring (5), and a flexible material is used to seal the gap between the prefabricated concrete well ring (5) and the well cover (4).

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