阅读说明：本技术 一种逆作法中间检查井施工方法 (Construction method of middle inspection well by reverse construction method ) 是由 魏浩鹏 邱俊新 陈冬枫 黎潮嘉 梁荣彬 叶群英 陈坚河 于 2021-08-19 设计创作，主要内容包括：本申请涉及检查井施工的技术领域,提出了一种逆作法中间检查井施工方法,通过采用逆作法施工的方式逐级开挖副基槽,逐级浇筑护筒顶段、护筒标准端以及护筒底端的方式进行护筒的浇筑施工,护筒浇筑过程中无需大规模开挖检查井施工区域附近的土体,使得检查井施工区域附近的土体不易被扰动,具有使检查井施工区域附近的埋设物不易沉降变形的效果。(The utility model relates to a technical field of inspection shaft construction, a construction method of inspection shaft in middle of reverse construction method is proposed, through adopting the mode of reverse construction method construction to excavate vice foundation trench step by step, pour the mode of protecting a section of thick bamboo top, protecting a section of thick bamboo standard end and protecting a section of thick bamboo bottom step by step and carry out the pouring construction of protecting a section of thick bamboo, it need not to excavate the soil body near inspection shaft construction area on a large scale to protect a section of thick bamboo pouring in-process, make the soil body near inspection shaft construction area difficult disturbed, have the effect that the buried object near messenger inspection shaft construction area is difficult for subsiding the deformation.)

1. A construction method of an intermediate inspection well by a reverse construction method is characterized in that: the method comprises the following steps:

s1: the device comprises a prefabricated cover plate (23), a shaft (231), a well cover (232), annular template components, a lifting assembly (4) and a plurality of pouring templates, wherein the lifting assembly (4) is connected with the annular template components;

s2: setting out a well position axis of the inspection well to a road surface through a total station and other related instruments by combining a design drawing, and determining a construction area of the inspection well;

s3: constructing a supporting structure around the construction area of the inspection well, wherein the projection of the supporting structure on the horizontal plane and the projection of the drain pipe (13) on the horizontal plane are arranged in a staggered manner;

s4: a main foundation trench (11) is formed in a construction area, an auxiliary foundation trench (12) is formed at the bottom of the main foundation trench (11), and the inner diameter of the main foundation trench (11) is larger than that of the auxiliary foundation trench (12);

s5: pouring of the top section (2) of the main casing: the top section reinforcing mesh is bound around the joint of the main base groove (11) and the auxiliary base groove (12); placing the annular template part to the bottom wall of the auxiliary base groove (12) through the lifting assembly (4), and supporting the annular template part; injecting concrete into a mold cavity formed by the annular mold plate, the bottom wall of the auxiliary base groove (12) and the side wall of the auxiliary base groove (12) to form a main pile casing top section (2), and removing the annular mold plate after the main pile casing top section (2) is formed;

s6: pouring of the auxiliary casing (24): building bricks on the side wall of the main foundation trench (11) to form an auxiliary pile casing (24), and after the auxiliary pile casing (24) is built, performing plastering treatment on the surface of the auxiliary pile casing (24) in a cement mortar smearing mode;

s7: pouring the standard section (21) of the main casing: continuously excavating soil at the bottom of the original auxiliary base groove (12) to form a new auxiliary base groove (12), and binding a standard section of reinforcing mesh on the side wall of the new auxiliary base groove (12); placing the annular template part to the bottom wall of the new auxiliary base groove (12) through the lifting assembly (4), erecting the annular template part, and injecting concrete into a mold cavity formed by the annular template part, the bottom wall of the new auxiliary base groove (12) and the side wall of the new auxiliary base groove (12) to form a main pile casing standard section (21); removing the annular template part after the main pile casing standard section (21) is solidified and molded;

s8: repeating the step S7 until the main casing standard section (21) is poured above the drain pipe (13);

s9: pouring the bottom section (22) of the main pile casing: digging soil at the bottom of the auxiliary base groove (12) to form a new auxiliary base groove (12), penetrating a drain pipe (13) into the new auxiliary base groove (12), and binding bottom section reinforcing mesh on the side wall of the new auxiliary base groove (12); erecting pouring templates, and pouring concrete into a die cavity formed by the plurality of pouring templates, the bottom wall of the new auxiliary foundation trench (12) and the side wall of the new auxiliary foundation trench (12) to form a main pile casing bottom section (22); after the main pile casing bottom section (22) is formed, removing the pouring formworks;

s10: pouring a double-grout layer (26) at the bottom of the auxiliary foundation trench (12), pouring a plain concrete cushion layer (27) after the double-grout layer (26) is solidified, binding a reinforcing mesh on the plain concrete cushion layer (27), and pouring concrete to form a reinforced concrete cushion layer (28);

s11: the drain pipe (13) positioned in the bottom section (22) of the main casing is broken, and the joint of the pipe orifice of the drain pipe (13) and the bottom section (22) of the main casing is repaired and leveled in a cement mortar smearing mode after the drain pipe (13) is broken;

s12: trowelling the inner walls of the top section (2) of the main pile casing, the standard section (21) of the main pile casing and the bottom section (22) of the main pile casing in a cement mortar smearing mode;

s13: installing steps (25) on the inner walls of the top section (2) of the main casing, the standard section (21) of the main casing and the bottom section (22) of the main casing;

s14: installing the shaft (231) on the cover plate (23) and enabling the shaft (231) to be communicated with the cover plate (23); moving the cover plate (23) to the top section (2) of the main casing, and installing the well cover (232) on the shaft (231);

s15: the gap between the auxiliary casing (24) and the shaft (231) is filled with sand and stones.

2. The method for constructing the middle inspection well by the reverse method according to claim 1, wherein: the annular template part comprises two groups of arc-shaped plates (3) which are symmetrically arranged, the end parts of two ends of the two groups of arc-shaped plates (3) are opposite in pairs, and connecting plates (31) are respectively inserted and matched between the opposite end parts of the two groups of arc-shaped plates (3); the annular template part is formed by two groups of arc plates (3) and two groups of connecting plates (31) in an enclosing manner; a grouting pipe (33) is arranged between the two groups of arc-shaped plates (3), and two ends of the grouting pipe (33) are respectively communicated with the two groups of arc-shaped plates (3); the grouting pipe fitting (33) is also communicated with a grout inlet pipe (32).

3. The method for constructing the middle inspection well by the reverse method according to claim 2, wherein: slip casting pipe fitting (33) are including the person in charge (331) of horizontal setting, the person in charge (331) axis is perpendicular with the plane of symmetry of adjacent arc (3), it has auxiliary pipe (332) all to peg graft in the person in charge (331) both ends, and is two sets of auxiliary pipe (332) keep away from the one end of being responsible for (331) and communicate with two sets of arc (3) respectively.

4. The method of claim 3, wherein the method comprises the following steps: the auxiliary pipe (332) is horizontally provided with a fixing plate (5), a screw rod (51) penetrates through the vertical thread of the fixing plate (5), and a drill rod (52) is coaxially arranged at the bottom end of the screw rod (51).

5. The method of claim 3, wherein the method comprises the following steps: the lifting component (4) comprises a frame (40) erected on the ground (1), a winch (41) is arranged on the frame (40), and the winch (41) is connected with a main pipe (331) through a traction rope (411).

6. The method for constructing the middle inspection well by the reverse method according to claim 2, wherein: the both sides that connecting plate (31) is relative all are provided with rectangular arch (311), and are two sets of one side that relative tip of arc (3) is close to each other all is provided with rectangular recess (30), rectangular recess (30) both ends opening, rectangular arch (311) of connecting plate (31) both sides are pegged graft respectively and are cooperated in rectangular recess (30) of two sets of arc (3) relative tip.

7. The method for constructing the middle inspection well by the reverse method according to claim 5, wherein: one end, far away from the winch (41), of the traction rope (411) is provided with a locking bolt (412), and the locking bolt (412) is in threaded connection with the outer wall of the main pipe (331).

8. The method for constructing the middle inspection well by the reverse method according to claim 1, wherein: the supporting structure comprises a plurality of jet grouting piles (14), and the adjacent jet grouting piles (14) are meshed with each other.

Technical Field

The application relates to the technical field of inspection well construction, in particular to a construction method of an intermediate inspection well in a reverse construction method.

Background

Along with the continuous development in city, the drainage demand in city is also constantly increasing, and the drainage ability of the original drainage pipe in city is in order can't satisfy ever-increasing drainage demand, for the condition more than improving, need add new drainage pipe usually, for making newly-increased drain pipe and original drain pipe exert effect jointly, need pour middle inspection shaft earlier on original drain pipe usually, in the inspection shaft in the middle of follow-up will newly-increased drain pipe and original drain pipe access, and then make original drain pipe and newly-increased drain pipe exert effect jointly.

In the correlation technique, the middle inspection well comprises a main protection cylinder, a circle of auxiliary protection cylinder is arranged around the top end of the main protection cylinder, a cover plate is further arranged on an opening of the top section of the main protection cylinder, the cover plate is communicated with a shaft, and a well cover is arranged at the top of the shaft. At present, when a middle inspection well is poured, a main pile casing is usually poured firstly, and the main pile casing is usually poured by adopting a cast-in-place open caisson method; before construction, a section of main pile casing is generally poured firstly, then the main pile casing is moved to a construction area, soil around the main pile casing and soil at the bottom of an inner cavity of the main pile casing are excavated, the main pile casing is made to sink continuously, meanwhile, a new main pile casing is formed by pouring continuously at the top section of the main pile casing, after the main pile casing sinks to a required depth, an original drainage pipe is connected into the main pile casing, the periphery of a well body is backfilled subsequently, and a cover plate, a shaft, a well cover and the like are sequentially installed at the top of the pile casing.

With respect to the above-described related art, the inventors consider that the following drawbacks exist: in the construction process of the cast-in-place open caisson method, a large amount of soil around the main pile casing needs to be excavated to enable the main pile casing to sink continuously, the soil around the inspection well in the construction area is loosened in the process, the buried objects around the inspection well are caused to settle, and the influence on the buried objects around the inspection well is large. Therefore, there is room for improvement.

Disclosure of Invention

In order to reduce the influence on the buried objects around during the construction of the middle inspection well, the application provides a construction method of the middle inspection well by a reverse construction method.

The application provides a middle inspection shaft construction method of reverse construction method, adopts following technical scheme:

a construction method of a reverse method middle inspection well comprises the following steps:

s1: the device comprises a prefabricated cover plate, a shaft, a well cover, annular template components, a lifting assembly and a plurality of pouring templates, wherein the lifting assembly is connected with the annular template components;

s2: setting out the shaft line of the inspection well to the road surface through a total station and other related instruments by combining a design drawing, and determining the construction area of the inspection well;

s3: constructing a supporting structure around the construction area of the inspection well, wherein the projection of the supporting structure on the horizontal plane and the projection of the drainage pipe on the horizontal plane are arranged in a staggered manner;

s4: a main foundation trench is formed in the construction area, an auxiliary foundation trench is formed at the bottom of the main foundation trench, and the inner diameter of the main foundation trench is larger than that of the auxiliary foundation trench;

s5: pouring the top section of the main pile casing: binding a top section of reinforcing mesh around the joint of the main base groove and the auxiliary base groove; placing the annular template part to the bottom wall of the auxiliary base groove through the lifting assembly, and supporting the annular template part; injecting concrete into a mold cavity formed by the annular mold plate, the bottom wall of the auxiliary base groove and the side wall of the auxiliary base groove to form a main pile casing top section, and removing the annular mold plate after the main pile casing top section is formed;

s6: pouring an auxiliary protecting cylinder: building bricks on the side wall of the main base groove to form an auxiliary pile casing, and after the auxiliary pile casing is built, performing surface finishing treatment on the surface of the auxiliary pile casing in a cement mortar smearing mode;

s7: pouring the standard section of the main pile casing: continuously excavating a soil body at the bottom of the original auxiliary foundation trench to form a new auxiliary foundation trench, and binding a standard section of reinforcing mesh on the side wall of the new auxiliary foundation trench; placing the annular template part to the bottom wall of the new auxiliary foundation trench through the lifting assembly, erecting the annular template part, and injecting concrete into a mold cavity formed by the annular template part, the bottom wall of the new auxiliary foundation trench and the side wall of the new auxiliary foundation trench to form a standard section of the main pile casing; removing the annular template part after the main pile casing standard section is solidified and molded;

s8: repeating the step S7 until the standard section of the main casing is poured above the drain pipe;

s9: pouring the bottom section of the main pile casing: digging soil at the bottom of the original auxiliary base groove to form a new auxiliary base groove, penetrating a drain pipe into the new auxiliary base groove, and binding a bottom section of reinforcing mesh on the side wall of the new auxiliary base groove; erecting pouring templates, and pouring concrete into a die cavity formed by the plurality of pouring templates, the bottom wall of the new auxiliary foundation trench and the side wall of the new auxiliary foundation trench to form a bottom section of the main pile casing; after the bottom section of the main pile casing is formed, removing the pouring templates;

s10: pouring a double-grout layer at the bottom of the auxiliary foundation trench, pouring a plain concrete cushion layer after the double-grout layer is solidified, binding a reinforcing mesh on the plain concrete cushion layer, and pouring concrete to form a reinforced concrete cushion layer; and further realize the sealing of the bottom section of the main protective cylinder.

S11: breaking a drain pipe positioned in the bottom section of the main casing, and repairing and leveling the joint of the pipe orifice of the drain pipe and the bottom section of the main casing in a cement mortar smearing mode after breaking;

s12: trowelling the inner walls of the top section, the standard section and the bottom section of the main pile casing in a cement mortar smearing mode;

s13: installing steps on the inner walls of the top section of the main casing, the standard section of the main casing and the bottom section of the main casing;

s14: installing a shaft on the cover plate, and communicating the shaft with the cover plate; moving the cover plate to the top section of the main pile casing, and installing the well cover on the shaft;

s15: and filling sand and stones into the gap between the auxiliary casing and the shaft.

By adopting the technical scheme, a reverse construction method is adopted, and by excavating the auxiliary foundation trench step by step and pouring the top end of the pile casing, the standard section of the main pile casing and the bottom section of the main pile casing step by step, compared with the traditional cast-in-place open caisson method, the method has the advantages that the large-scale excavation of the soil body in the construction range of the inspection well is not needed, the condition that the soil body around the construction area of the inspection well is loosened due to the large-scale excavation of the soil body, the settlement of the underground buried object around the inspection well is further avoided, and the influence of the construction of the inspection well on the buried object around the inspection well is reduced; through the setting of lifting unit and annular template spare, utilize lifting unit to drive annular template spare and remove at vice basic inslot, be convenient for remove annular template spare to vice basic groove bottom, and then the annular template spare of being convenient for prop up and establish, when annular template spare was demolishd to follow-up needs, still can shift out annular template spare through lifting unit.

Preferably, the annular template part comprises two groups of arc-shaped plates which are symmetrically arranged, the end parts of the two ends of the two groups of arc-shaped plates are opposite in pairs, and connecting plates are inserted and matched between the opposite end parts of the two groups of arc-shaped plates; the annular template part is formed by two groups of arc-shaped plates and two groups of connecting plates in an enclosing manner; a grouting pipe fitting is arranged between the two groups of arc-shaped plates, and two ends of the grouting pipe fitting are respectively communicated with the two groups of arc-shaped plates; the grouting pipe is also communicated with a grout inlet pipe.

Through adopting above-mentioned technical scheme, when pouring main section of thick bamboo top or main section of thick bamboo standard section of protecting, prop up annular template spare and establish back in vice kerve, toward advancing intraductal injection concrete of thick liquid, the concrete flows in annular template spare, in the die cavity of vice kerve diapire and vice kerve lateral wall formation via the both ends of slip casting pipe fitting, and then realizes the pouring of main section of thick bamboo top or main section of thick bamboo standard section of protecting for the construction that main section of thick bamboo standard section and main section of thick bamboo top of protecting is simple and convenient more.

Preferably, the slip casting pipe fitting is including the person in charge of the level setting, the main pipe axis is perpendicular with the plane of symmetry of adjacent arc, it has the auxiliary pipe to all peg graft at the person in charge both ends and slide, and is two sets of the one end that the person in charge was kept away from to the auxiliary pipe communicates with two sets of arcs respectively.

Through adopting above-mentioned technical scheme, take the back out the connecting plate from the one end that adjacent arc is close to each other, through sliding into the person in charge with two sets of auxiliary pipes to make two sets of arcs be close to each other, alright realize demolising of annular template spare, make demolising of annular template spare simple and convenient more.

Preferably, the auxiliary pipe is horizontally provided with a fixing plate, a screw rod penetrates through the vertical thread of the fixing plate, and a drill rod is coaxially arranged at the bottom end of the screw rod.

By adopting the technical scheme, the drill rod is drilled into the soil body at the bottom of the auxiliary foundation trench by rotating the screw rod, so that the position of the auxiliary pipe is fixed, the arc-shaped plate is limited from generating displacement, and the annular template piece is supported, so that when concrete is injected into the mold cavity, the annular template piece is not easy to generate displacement, and the concrete is convenient to better mold; when the annular template part is subsequently dismantled, the screw rod is screwed, so that the drill rod is separated from the soil body at the bottom of the auxiliary foundation trench, and the annular template part can be moved; in the process that the drill rod is separated from the soil body at the bottom of the auxiliary foundation trench, the soil body at the bottom of the auxiliary foundation trench can be stirred and loosened, so that the soil body at the bottom wall of the auxiliary foundation trench can be excavated better in the follow-up process.

Preferably, the lifting assembly comprises a frame erected on the ground, the frame is provided with a winch, and the winch is connected with the main pipe through a traction rope.

By adopting the technical scheme, the hoisting machine is arranged, and the hoisting machine is used for winding the traction rope or releasing the traction rope to drive the annular template part to lift in the auxiliary base groove, so that the annular template part can move more simply and conveniently.

Preferably, both sides that the connecting plate is relative all are provided with rectangular arch, and are two sets of one side that the relative tip of arc is close to each other all is provided with rectangular recess, rectangular recess both ends opening, the rectangular arch of connecting plate both sides is pegged graft respectively and cooperates in the rectangular recess of the relative tip of two sets of arcs.

Through adopting above-mentioned technical scheme, slide respectively through the rectangular arch of connecting plate both sides and peg graft in the rectangular recess of the relative tip of two sets of arcs, be favorable to promoting the leakproofness between connecting plate and the arc for the concrete in the mould intracavity is difficult for spilling from the clearance between arc and the connecting plate, and the concrete in the mould intracavity of being convenient for is shaping better.

Preferably, one end of the traction rope, which is far away from the winch, is provided with a locking bolt, and the locking bolt is in threaded connection with the outer wall of the main pipe.

Through adopting above-mentioned technical scheme, with locking bolt and be responsible for threaded connection alright realize the haulage rope and be responsible for be connected, and then make the hoist engine can come lift annular template spare through coiling or release haulage rope, this simple structure is convenient and easily operation, has simplified being connected of hoist engine and annular template spare.

Preferably, the supporting structure comprises a plurality of jet grouting piles, and the adjacent jet grouting piles are meshed with each other.

By adopting the technical scheme, the adjacent jet grouting piles are mutually meshed, so that soil bodies near the construction area of the inspection well are reinforced, and the soil bodies on the side walls of the main foundation trench and the auxiliary foundation trench are not easy to collapse in the excavation process of the main foundation trench and the auxiliary foundation trench, so that the construction process of the inspection well is safer; meanwhile, the situation that the peripheral soil body is stirred and supported when the main foundation trench and the auxiliary foundation trench are dug is reduced, and the situation that the underground surrounding structures are buried in the inspection well construction is favorably reduced.

In summary, the present application includes at least one of the following beneficial technical effects:

1. by adopting a reverse construction method, the auxiliary foundation trench is excavated layer by layer, and the top end of the pile casing, the standard end of the pile casing and the bottom section of the main pile casing are poured layer by layer, so that the condition that soil around the inspection well is loosened in the construction process of the inspection well and further the buried objects around are settled is favorably reduced; the lifting assembly is arranged and connected with the annular template part, and the annular template part is moved to the bottom wall of the auxiliary foundation groove through the lifting assembly, so that the annular template part is convenient to support;

2. the two ends of the main pipe are slidably inserted with the auxiliary pipes, the two ends of the auxiliary pipes are respectively communicated with the two groups of arc-shaped plates, and after the connecting plate is pulled out from the opposite end parts of the two groups of arc-shaped plates, the two groups of auxiliary pipes can be moved back into the main pipe, so that the two groups of arc-shaped plates are close to each other, and the annular template part is detached;

3. through the setting of the rectangular protruding difference slip grafting in the rectangular recess of the relative tip of two sets of arcs of connecting plate both sides, be favorable to improving the leakproofness of connecting plate and arc junction to make the difficult clearance of following between arc and the connecting plate of concrete in the die cavity spill, be favorable to the shaping of concrete in the die cavity.

Drawings

FIG. 1 is a schematic cut-away view of an inspection well for illustrating embodiments of the present application.

FIG. 2 is a schematic diagram illustrating a lifting assembly and an annular template member according to an embodiment of the present application.

FIG. 3 is a schematic structural diagram for illustrating an annular template member according to an embodiment of the present application.

Fig. 4 is an enlarged schematic view of a portion a in fig. 3.

Description of reference numerals:

1. a ground surface; 11. a main base groove; 12. a secondary base groove; 13. a drain pipe; 14. carrying out jet grouting pile; 2. a main casing top section; 21. a main pile casing standard section; 22. a main casing bottom section; 23. a cover plate; 231. a wellbore; 232. a well cover; 24. an auxiliary protective cylinder; 25. stepping; 26. a double slurry layer; 27. a plain concrete cushion; 28. a reinforced concrete cushion layer; 3. an arc-shaped plate; 30. a strip groove; 31. a connecting plate; 311. a strip projection; 32. a pulp inlet pipe; 33. grouting the pipe fitting; 331. a main pipe; 332. a secondary pipe; 4. a lifting assembly; 40. a frame; 41. a winch; 411. a hauling rope; 412. locking the bolt; 5. a fixing plate; 51. a screw; 53. a handle; 52. and (5) drilling a rod.

Detailed Description

The present application is described in further detail below with reference to figures 1-4.

The embodiment of the application discloses a construction method of a middle inspection well by a reverse construction method, which comprises the following steps with reference to fig. 1 and 2:

s1: the prefabricated cover plate 23, the shaft 231, the well cover 232, the annular template components, the lifting assembly 4 and the pouring templates, wherein the lifting assembly 4 is connected with the annular template components; the cover plate 23, the shaft 231 and the well cover 232 are both of reinforced concrete structures;

s2: lofting the shaft line of the inspection well to the road surface through a total station and other related instruments by combining a design drawing; determining a construction area of the inspection well by lofting the axis of the inspection well to the ground 1;

s3: constructing a supporting structure around the construction area of the inspection well, wherein the projection of the supporting structure on the horizontal plane and the projection of the drain pipe 13 on the horizontal plane are arranged in a staggered manner; in the embodiment, the supporting structure comprises a plurality of mutually-meshed jet grouting piles 14, and the soil around the inspection well is reinforced by using the supporting structure formed by the jet grouting piles 14, so that when the main foundation trench 11 and the auxiliary foundation trench 12 are excavated, the soil near the construction area of the inspection well is not easily disturbed, and the buried object near the construction area of the inspection well is not easily subjected to settlement deformation;

s4: a main base groove 11 is formed in a construction area of the inspection well, an auxiliary base groove 12 is formed at the bottom of the main base groove 11, and the inner diameter of the main base groove 11 is larger than that of the auxiliary base groove 12; the excavated waste soil is timely removed to the ground 1 in the excavation process of the main base groove 11 and the auxiliary base groove 12; after the main base groove 11 and the auxiliary base groove 12 are excavated, the side walls and the bottom walls of the auxiliary base groove 12 and the main base groove 11 are compacted so as to reduce the collapse of soil on the side walls of the auxiliary base groove 12 in the construction process;

s5: pouring of the top section 2 of the main casing: the top section reinforcing mesh is bound around the joint of the main base groove 11 and the auxiliary base groove 12; placing the annular template part to the bottom wall of the auxiliary base groove 12 through the lifting assembly 4, erecting the annular template part, injecting concrete into a mold cavity formed by the annular template part, the bottom wall of the auxiliary base groove 12 and the side wall of the auxiliary base groove 12 to form a main pile casing top section 2, and removing the annular template part after the main pile casing top section 2 is formed; after the top end of the pile casing is poured, the pouring time of the top section 2 of the main pile casing is recorded in time, and the annular template part can be removed only when the concrete strength of the top section 2 of the main pile casing reaches more than seventy percent, so that the pouring quality of the top section 2 of the main pile casing is ensured;

s6: pouring of the auxiliary casing 24: building bricks on the side wall of the main base groove 11 to form an auxiliary pile casing 24, and after the auxiliary pile casing 24 is built, performing plastering treatment on the surface of the auxiliary pile casing 24 by adopting a cement mortar smearing mode;

s7: pouring the standard section 21 of the main casing: continuously excavating a soil body at the bottom of the original auxiliary base groove 12 to form a new auxiliary base groove 12, and cleaning the excavated waste soil in time in the excavation process of the new auxiliary base groove 12; binding a standard section of reinforcing mesh on the side wall of the new auxiliary foundation trench 12; placing the annular template part to the bottom wall of the new auxiliary base groove 12 through the lifting assembly 4 and supporting the annular template part; injecting concrete into a die cavity formed by the annular die plate part, the bottom wall of the new auxiliary base groove 12 and the side wall of the new auxiliary base groove 12 to form a main pile casing standard section 21; removing the annular template part after the main pile casing standard section 21 is solidified and molded;

s8: repeating the step S7 until the main casing standard section 21 is poured above the drain pipe 13;

s9: pouring of the bottom section 22 of the main pile casing: digging soil at the bottom of the original auxiliary base groove 12 to form a new auxiliary base groove 12, and arranging a drain pipe 13 in the new auxiliary base groove 12 in a penetrating manner; binding bottom section reinforcing mesh on the side wall of the new auxiliary foundation trench 12; erecting pouring templates, and pouring concrete into a mold cavity formed by the pouring templates, the bottom wall of the new auxiliary foundation trench 12 and the side wall of the new auxiliary foundation trench 12 to form a main pile casing bottom section 22; after the main pile casing bottom section 22 is formed, removing the pouring templates;

s10: pouring a double-grout layer 26 to the bottom of the auxiliary foundation trench 12, and reinforcing the soil body at the bottom of the auxiliary foundation trench 12 through the double-grout layer 26; firstly, a plain concrete cushion layer 27 is poured on the double-liquid-slurry layer 26, after the plain concrete cushion layer 27 is solidified, a reinforcing mesh is bound on the plain concrete cushion layer 27, concrete is poured to form a reinforced concrete cushion layer 28, and the sealing of the bottom section 22 of the main pile casing is realized;

s11: the drain pipe 13 in the bottom section 22 of the main casing is broken, manual operation breaking and dismantling equipment is adopted to break the drain pipe section by section during breaking, and garbage generated in the process of breaking the drain pipe 13 is cleaned in time after breaking; repairing and leveling the joint of the pipe orifice of the drain pipe 13 and the bottom section 22 of the main casing in a manner of coating cement mortar after cleaning;

s12: trowelling the inner walls of the top section 2 of the main pile casing, the standard section 21 of the main pile casing and the bottom section 22 of the main pile casing in a mode of coating cement mortar;

s13: the steps 25 are arranged on the inner walls of the top section 2 of the main casing, the standard section 21 of the main casing and the bottom section 22 of the main casing, so that a subsequent maintainer can conveniently fall into an inspection well through the steps 25 for overhauling;

s14: the shaft 231 is fixedly mounted on the cover plate 23 by bonding mortar, and the shaft 231 is communicated with the cover plate 23; moving the cover plate 23 to the top section 2 of the main casing, and then installing the well lid 232 on the shaft 231;

s15: the gap between the sub casing 24 and the shaft 231 is filled with gravel or sand.

Referring to fig. 2 and 3, the annular template member includes two sets of arc plates 3 symmetrically arranged, the concave surfaces of the two sets of arc plates 3 are arranged oppositely, the end portions of the two ends of the two sets of arc plates 3 are arranged oppositely, and a connecting plate 31 is arranged between the end portions of the two sets of arc plates 3. The annular template part is formed by encircling and splicing two groups of arc-shaped plates 3 and two groups of connecting plates 31;

referring to fig. 3 and 4, the two opposite sides of the connecting plate 31 are fixedly connected with long-strip protrusions 311, the length directions of the long-strip protrusions 311 are parallel to the length direction of the connecting plate 31, the two opposite ends of the two groups of arc-shaped plates 3 are respectively provided with a long-strip groove 30, two ends of each long-strip groove 30 are provided with openings, and the long-strip protrusions 311 on the two opposite sides of the connecting plate 31 are respectively inserted into the long-strip grooves 30 on the two opposite ends of the two groups of arc-shaped plates 3 in a sliding manner; through above setting, be favorable to promoting the leakproofness of connecting plate 31 and 3 junctions of arc for when pouring concrete in the die cavity that toward annular template piece, the 12 diapalls of vice base groove and the 12 lateral walls three of vice base groove formed, the concrete is difficult for spilling over from the junction of connecting plate 31 and arc 3, and the concrete of being convenient for is the shaping in the die cavity better.

Referring to fig. 2 and 3, a grouting pipe 33 is further arranged between the two groups of arc-shaped plates 3, the axis of the grouting pipe 33 is perpendicular to the symmetrical surfaces of the two groups of arc-shaped plates 3, two ends of the grouting pipe 33 are respectively communicated with the two groups of arc-shaped plates 3, and the grouting pipe 33 is further communicated with a grout inlet pipe 32; when pouring main section of thick bamboo top section 2 or main section of thick bamboo standard segment 21 of protecting, prop earlier and establish annular template spare, the rethread advances thick liquid pipe 32 and pours into the concrete into in slip casting pipe fitting 33, the concrete flows into annular template spare, in the die cavity that vice foundation ditch 12 diapire and vice foundation ditch 12 lateral wall three formed through the both ends of slip casting pipe fitting 33, alright accomplish the pouring of main section of thick bamboo top section 2 or main section of thick bamboo bottom segment 22 of protecting for main section of thick bamboo standard segment 21 and the pouring of main section of thick bamboo bottom segment 22 of protecting are simple and convenient more.

Referring to fig. 2 and 3, the grouting pipe 33 includes a main pipe 331 horizontally disposed, two ends of the main pipe 331 are coaxially and slidably inserted with auxiliary pipes 332, and ends of the two sets of auxiliary pipes 332 far away from the main pipe 331 are respectively communicated with the two sets of arc plates 3. Through the above setting, when demolising the annular template, shift out earlier connecting plate 31 from between the tip that two sets of arc 3 are relative, slide into the person in charge 331 with two sets of looped pipes 332 after that, make two sets of arc 3 be close to each other, alright realize demolising of annular template spare, during the installation annular template spare, shift out two sets of looped pipes 332 and be responsible for 331, make two sets of arc 3 keep away from each other, and slide into the rectangular recess 30 of the tip that two sets of arc 3 are relative respectively with rectangular protruding 311 of connecting plate 31 both sides, alright accomplish the concatenation of annular template spare. The pulp inlet pipe 32 is positioned at the peripheral wall of the top end of the main pipe 331 and is communicated with the main pipe 331.

Referring to fig. 2 and 3, two sets of fixing plates 5 are horizontally and fixedly connected to the outer wall of one end of the secondary pipe 332, which is far away from the main pipe 331, the two sets of fixing plates 5 are symmetrically arranged about the axis of the secondary pipe 332, the fixing plates 5 are vertically threaded with screws 51, and the top ends of the screws 51 are fixedly connected with handles 53, so that the screws 51 can be conveniently rotated; the coaxial fixedly connected with drilling rod 52 in screw 51 bottom, in this embodiment, drilling rod 52 is fried dough twist drill rod 52, be convenient for drill into the soil layer better, rotate screw 51 through handle 53 and make drilling rod 52 bore into the vice base groove 12 bottom soil body, make the position of auxiliary pipe 332 fixed, and then restrict two sets of arcs 3 and produce the displacement, thereby when making into the interior concrete of injecting of die cavity, the difficult displacement that produces of annular die plate spare, the concrete of being convenient for is the shaping in the die cavity better. When the auxiliary pipe 332 needs to slide into the main pipe 331 in the later period, the two groups of drill rods 52 are moved out of the soil body at the bottom of the auxiliary base groove 12 by rotating the screw 51, so that the auxiliary pipe 332 can slide into the main pipe 331, the two groups of arc-shaped plates 3 are close to each other, and the annular template component is dismantled. The soil body can be stirred and loosened in the process that the drill rod 52 is screwed out of the soil body at the bottom of the auxiliary base groove 12, so that the soil body can be conveniently and continuously excavated at the bottom of the auxiliary base groove 12 subsequently.

Referring to fig. 2 and 3, the lifting assembly 4 includes a frame 40 erected on the ground 1, the frame 40 is located above the main base groove 11, a winch 41 is installed on the frame 40, the winch 41 is arranged opposite to the notch of the main base groove 11, the winch 41 is connected with the main pipe 331 through two sets of hauling ropes 411, and the winding drum of the winch 41 is used for winding or releasing to control the movement of the annular formwork in the auxiliary base groove 12, so that the movement of the annular formwork is simpler and more convenient.

Referring to fig. 2 and 3, locking bolts 412 are fixedly connected to ends of the two groups of hauling ropes 411, which are far away from the winch 41, and the two groups of locking bolts 412 are respectively in threaded connection with the outer circumferential wall of the top of the main pipe 331. The main tube 331 further defines a threaded hole for the locking bolt 412 to be threadedly coupled. Through above setting, with locking bolt 412 and the person in charge 331 threaded connection, alright coil or release haulage rope 411 through hoist engine 41 and go up and down the annular template spare, after the construction is accomplished, can twist out locking bolt 412 from the screw hole, be convenient for separate the accomodating of annular template spare and lifting unit 4.

The supporting and dismantling steps of the annular formwork part in the embodiment of the application are as follows:

when the annular template component is erected: placing the annular template part at the bottom of the auxiliary base groove 12 through the lifting assembly 4; the two groups of auxiliary pipes 332 are slid to enable the two groups of auxiliary pipes 332 to be away from each other, and the two groups of strip protrusions 311 of the connecting plate 31 are respectively inserted into the strip grooves 30 at the opposite ends of the two groups of arc-shaped plates 3; the handle 53 rotates the screw 51, so that the drill rod 52 is drilled into the soil at the bottom of the auxiliary foundation trench 12, and the annular formwork component can be erected.

When the annular template part is dismantled: firstly, two groups of connecting plates 31 are drawn out from the opposite end parts of the two groups of arc-shaped plates 3, then the screw 51 is rotated until the drill rod 52 is drawn out from the soil body at the bottom of the auxiliary base groove 12, and the two groups of auxiliary pipes 332 are slid into the main pipe 331 by sliding the two groups of auxiliary pipes 332, so that the two groups of arc-shaped plates 3 are close to each other, and the annular template part is dismantled.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.