CN114908856A - Auxiliary well structure for connecting newly-built pipeline with existing well chamber and construction method thereof - Google Patents

Abstract

The invention discloses an attached well structure for connecting a new pipeline with an existing well room and a construction method thereof, comprising the following steps: constructing a foundation pit supporting structure attached to the well, and adopting a grading or steel sheet pile supporting structure according to the excavation depth; The attached well is constructed on the side of the existing reinforced concrete well room to be connected; the connection point position is determined according to the water supply and drainage design; the water mill drill is used to drill the opening in layers, and the remaining wall thickness of 40-60mm is to be completed after all construction is completed. Complete the construction and testing of all pipelines and wells, and meet the conditions for water passage; pour water into the attached well until the water level is consistent with the current level of reinforced concrete wells; divers underwater remove the remaining wall thickness to realize the new pipeline and The connection of the existing reinforced concrete well room. Most of the connection work is carried out under dry operation conditions in the attached well, which greatly improves the construction operation conditions, and the construction operation is simple and safe, the construction period is short, and the construction cost is low.

Description

A well-attached structure for connecting a new pipeline with an existing well room and its construction method

technical field

The invention relates to the technical field of municipal drainage construction, in particular to an attached well structure for connecting a new pipeline with an existing well room and a construction method thereof.

Background technique

During the construction of urban drainage pipelines, it is common for new pipelines to be connected to the existing reinforced concrete wells (including culverts). The connection between the pipeline and the existing reinforced concrete well room (including underdrain) brings great challenges.

At present, the connection construction technology of the new pipeline and the existing reinforced concrete well room (including the underdrain) mainly includes: (1) the upstream and downstream of the existing reinforced concrete well room (including the underdrain) are artificially cut down after the airbag or wall is blocked; (2) Under water conditions, divers go down the well and dig out underwater, such as the construction method for connecting new sewage pipes and existing sewage pipes disclosed in Chinese patent CN202010053573.6; Chinese patent CN201821950675.2 discloses a large-diameter underground reinforced concrete water supply and drainage pipe non-stop connection device; the above method has the characteristics of large amount of blocking and diversion works, large impact on the existing drainage system, long underwater operation time, and high safety risk. .

SUMMARY OF THE INVENTION

Aiming at the deficiencies of the prior art, the present invention provides a well-attached structure for connecting a new pipeline with an existing well room and a construction method thereof, so as to achieve the purpose of simple and safe construction operation.

In order to solve the above-mentioned technical problems, the technical scheme adopted in the present invention is:

An attached well structure for connecting a new pipeline and an existing well room, the attached well structure is arranged between the newly built pipeline and the existing well room, and the attached well structure comprises an attached well foundation, an attached well wall and an attached well cover, The wall of the attached well is arranged on the foundation of the attached well, and the cover plate of the attached well is arranged on the top of the wall of the attached well. The openings of the existing well chamber and the attached well, and the other side of the wall of the attached well is connected to the end of the new pipeline.

The attached well foundation is provided with an attached well cushion, and the attached well wall is arranged on the attached well cushion.

The attached well cover is provided with an attached wellbore, and the top of the attached wellbore is provided with an attached wellbore that is flush with the ground.

The existing well wall is provided with a planting bar which is connected with the attached well wall.

The wall of the attached well is a square wall structure with one side open.

Up and down corresponding climbing ladders are arranged on the wall of the attached well and the inner wall of the attached wellbore.

A construction method of a well-attached structure for connecting a new pipeline with an existing well room, comprising the following steps:

Step 1: Build the supporting structure of the foundation pit attached to the well, and adopt the grading or steel sheet pile supporting structure according to the excavation depth;

Step 2: Construction of the attached well on the side of the existing reinforced concrete well room to be connected;

Step 3: The location of the connection point determined according to the water supply and drainage design;

Step 4: Use a water mill drill to drill into the opening in layers, and finally the remaining 40-60mm wall thickness is to be broken underwater at one time before the water is passed after all constructions are completed;

Step 5: Complete all pipelines, well room construction and testing and testing, and have water supply conditions;

Step 6: Fill the attached well with water until the water level is consistent with the current water level in the reinforced concrete well;

Step 7: Divers break the remaining wall thickness underwater to realize the connection between the new pipeline and the existing reinforced concrete well room.

The supporting structure includes steel sheet piles, corbels and purlins, the purlins are arranged on the inner side of the steel sheet piles through the corbels, and a safety rail is provided on the top of the steel sheet piles.

Compared with the prior art, the present invention has the following advantages:

The attached well structure and construction method for the connection between the new pipeline and the existing well room are reasonably designed. Most of the connection work is carried out under dry working conditions in the attached well, which greatly improves the construction operation conditions and ensures the safety of construction workers. , the construction quality is visible and controllable, the construction operation is simple and safe, the construction period is short, and the construction cost is low.

Description of drawings

Below is a brief description of the content expressed in each of the drawings in this specification and the symbols in the drawings:

FIG. 1 is a schematic plan view of the structure of the attached well according to the present invention.

FIG. 2 is a schematic cross-sectional view along A-A in FIG. 1 .

FIG. 3 is a schematic cross-sectional view along B-B in FIG. 1 .

FIG. 4 is an enlarged schematic view of the opening of the present invention.

In the picture:

1-Attached well cushion, 2-Attached well foundation, 3-Attached well wall, 4-Attached well cover, 5-Attached well bore, 6-Attached well cover, 7-New pipeline, 8-Existing well wall, 9 - Opening, 10-planting reinforcement, 11-steel sheet pile, 12-corbel, 13-purlin, 14-gusset, 15-safety railing, 16-climbing ladder, 17-runner.

Detailed ways

The specific embodiments of the present invention will be described in further detail below through the description of the embodiments with reference to the accompanying drawings.

As shown in Figures 1 to 4, the attached well structure connecting the new pipeline and the existing well room is set between the new pipeline and the existing well room; the attached well structure includes the attached well foundation 2, the attached well wall 3 and the attached well The well cover 4, the wall of the attached well is set on the foundation of the attached well, the cover of the attached well is set on the top of the wall of the attached well, one side of the wall of the attached well is connected to the existing well wall 8 of the existing well room, and the wall of the existing well is set. There is an opening 9 for connecting the existing well room and the attached well, and the other side of the wall of the attached well is connected with the end of the newly built pipeline 7 .

The shaft wall 3 of the attached well is a square shaft wall structure with one side opening, and a cushion layer 1 is provided on the foundation of the attached well, and the wall of the attached well is arranged on the cushion layer of the attached well.

The attached well cover is provided with an attached well 5, and the top of the attached well is provided with an attached well cover 6 that is flush with the ground, which reduces costs and facilitates construction; and on the attached well wall and the inner wall of the attached well Up and down the corresponding ladder for easy construction.

The construction method of the attached well structure for connecting the new pipeline and the existing well room of the present invention comprises the following steps:

Step 1: Build the supporting structure of the foundation pit attached to the well, and adopt the grading or steel sheet pile supporting structure according to the excavation depth;

Step 2: Construction of the attached well on the side of the existing reinforced concrete well room to be connected;

Step 3: The location of the connection point determined according to the water supply and drainage design;

Step 4: Use a water mill drill to drill into the opening in layers, and finally the remaining 40-60mm wall thickness is to be broken underwater at one time before the water is passed after all constructions are completed;

Step 5: Complete all pipelines, well room construction and testing and testing, and have water supply conditions;

Step 6: Fill the attached well with water until the water level is consistent with the current water level in the reinforced concrete well;

Step 7: Divers break the remaining wall thickness underwater to realize the connection between the new pipeline and the existing reinforced concrete well room.

The supporting structure includes steel sheet piles 11, corbels 12 and purlins 13, the purlins are arranged on the inner side of the steel sheet piles through the corbels, and a safety rail 15 is arranged on the top of the steel sheet piles; and corner braces 14 are arranged at the corners. , the structure is stable and reliable.

Most of the connection work of the invention is carried out under dry operation conditions in the attached well, which greatly improves the construction operation conditions, ensures the life safety of construction workers, the construction quality is visible and controllable, the construction operation is simple and safe, and the construction period is short. Construction cost is low.

Preferred specific examples are:

A U-shaped attached well for connection is implemented next to the existing reinforced concrete well. The size of the U-shaped attached well is reasonably determined according to the cross-section of the connection and the construction space. The contact surface between the U-shaped attached well and the existing reinforced concrete well should be planted with reinforcing bars. Make sure the seams are tight to prevent leaks. In the U-shaped attached well, the current reinforced concrete well room (including the underdrain) is connected, and the existing well wall is drilled by using a water mill in layers, until the remaining 50mm is drilled at one time when all the construction is completed and the water supply conditions are met. The above construction is carried out under dry construction conditions, and the current reinforced concrete well room maintains normal operation. Then carry out the recovery construction of the attached well roof and ground and the corresponding test and inspection. After the upstream and downstream pipelines are completed and the water supply conditions are met, water is injected into the attached well and the connected downstream pipelines until the water level is consistent with the existing indoor water level of the reinforced concrete well. Diving into the attached well to excavate the remaining 50mm thick existing well wall, and complete the water connection between the new pipeline and the existing reinforced concrete well room.

In this scheme, the support structure of the newly built attached well as the open-hole working surface is also a permanent structure in the state of water-passing use, which reduces the use time of temporary support and the exposure time of foundation pit compared with conventional construction, and reduces the safety risk. The current wellbore drilling is carried out under dry working conditions in the attached well, and the water mill drilling hole breaking technology is adopted, and the breaking section can be seen and controllable, which can effectively ensure the construction quality and safety. The final 50mm-thick well wall is broken by a diver underwater to break through the water at one time, which greatly reduces the amount of diversion and drainage works or reduces the underwater operation time of the diver compared with conventional construction, effectively ensuring construction safety. Each process before the final 50mm break can be constructed simultaneously with other tube wells. The additional well and connection construction takes up only the critical construction period of the final 50mm break, which can effectively shorten the construction period and reduce costs.

As shown in Figure 2, the attached well structure includes attached well cushion, attached well foundation, attached well shaft wall, attached well cover, attached well bore and attached well cover; first, the foundation pit supporting structure, Attached well cushion 1, attached well foundation 2 and attached well wall 3. In this example, the excavation depth of the foundation pit is 3 meters, the steel sheet piles are Larsen IV steel sheet piles with a length of 9 meters, the purlins 13 and the gussets 14 are made of profiled steel, and the corbels are welded on the steel sheet piles with steel plates, and the spacing is 80cm; the cushion layer 1 with the well is made of 100mmC15 concrete with a plane size of 2300mm×2300mm; the foundation 2 with a well is made of 300mmC30 reinforced concrete with a plane size of 2200mm×2200mm; the shaft wall 3 with a well is made of reinforced concrete with a thickness of 250mmC30. The clearance size is 1500mm×1500mm; when constructing the wall 3 of the attached well, the contact surface between the wall 3 of the attached well and the wall 8 of the existing well needs to be chiseled, and the reinforcement is planted on the wall of the existing well, as shown in Figure 1. The planting bars are made of steel bars, the spacing is 200mm, the depth of the planting bars is 250mm, and the exposure is 250mm.

As shown in Figure 3, the construction process for the connection between the new pipeline and the existing reinforced concrete well room (including the underdrain) includes: construction of the foundation pit supporting structure and the wall 3 of the attached well (including planting bars and joint sealing treatment), and the construction of the attached well. After completion, backfill and dismantle the foundation pit support structure; water mill drill to remove the existing well wall of the first layer; water mill drill to remove the existing well wall of the second layer; step 4: construction ladder 16, flow groove 17, attached well cover 4, attached well shaft 5 and the attached well cover 6; the attached well wall 3 and the newly built pipeline 7 are injected with horizontal pressure; the remaining 50mm thick existing well wall is broken underwater by divers.

The water mill core is broken, and the water mill is fixed on the existing well wall by expansion screws, providing a fixed base and reaction force for the water mill drilling. The drilling depth of the water mill drill should be strictly controlled to ensure that the drilling depth is consistent, the broken section is flat, and the drilling is too deep to prevent water penetration accidents caused by drilling through the well wall. When operators are working underground, special personnel should be set up to monitor them, and emergency rescue materials and equipment should be prepared on the well. In the event of an emergency, rescue immediately.

When divers break the remaining 50mm thick existing well wall underwater, they should use underwater air picks. Experienced professional divers should be selected. Divers should conduct safety technical disclosure before going down the well, and check that the diving equipment is in good condition and functioning properly. Divers should wear safety ropes, long-tube ventilators, communication cables and microphones when going down the well, and strictly abide by the safety operation rules during diving operations.

The present invention has the following advantages: 1. The construction is dry, and the underwater operation time is minimized: most of the connection work is carried out under the dry operation condition in the attached well, which greatly improves the construction operation conditions and minimizes the underwater operation time. , to ensure the life safety of construction workers; 2. The construction quality is visible and controllable: due to the dry construction, the entire construction process can be carried out under the supervision of the on-site technical quality management personnel, which is more conducive to the control of the construction quality of the connection and opening. Thereby improving the construction quality; 3. Construction safety is more guaranteed: due to dry construction, the entire construction process can be carried out under the supervision of on-site safety management personnel, which is more conducive to the management of connection and opening construction safety, thus effectively ensuring construction safety; 4. The construction period is short and the construction cost is low: the existing well wall water mill drilling hole before the final 50mm is broken and the pipeline is constructed at the same time, which can shorten the construction period and reduce the construction cost.

The above description is only for the description of the preferred embodiments of the present invention, and the above technical features can be combined arbitrarily to form a plurality of embodiments of the present invention.

The present invention has been exemplarily described above in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above manner, as long as various insubstantial improvements made by the concept and technical solutions of the present invention are adopted, or the If the concept and technical solutions of the present invention are directly applied to other occasions, they all fall within the protection scope of the present invention.

Claims (8)

1. The utility model provides a newly-built pipeline attaches well structure with what current well room plugged into, attach the well structure setting between newly-built pipeline and current well room, its characterized in that: the well attaching structure comprises a well attaching foundation, a well attaching wall and a well attaching cover plate, wherein the well attaching wall is arranged on the well attaching foundation, the well attaching plate is arranged at the top of the well attaching wall, one side of the well attaching wall is connected with the current well wall of the current well chamber, an opening used for communicating the current well chamber with the well attaching wall is formed in the current well wall, and the other side of the well attaching wall is connected with the end part of a newly-built pipeline.

2. The additional well structure for connecting the newly-built pipeline with the existing well chamber according to claim 1, is characterized in that: and an auxiliary well cushion layer is arranged on the auxiliary well foundation, and the wall of the auxiliary well is arranged on the auxiliary well cushion layer.

3. The additional well structure for connecting the newly-built pipeline with the existing well chamber according to claim 1, is characterized in that: and an auxiliary well shaft is arranged on the auxiliary well cover plate, and an auxiliary well cover which is parallel and level with the ground is arranged at the top of the auxiliary well shaft.

4. The additional well structure for connecting the newly-built pipeline with the existing well chamber according to claim 1, is characterized in that: and the current well wall is provided with embedded bars connected with the well wall of the auxiliary well.

5. The additional well structure for connecting the newly-built pipeline with the existing well chamber according to claim 1, is characterized in that: the wall of the auxiliary well is a square well wall structure with an opening at one side.

6. The additional well structure for connecting the newly-built pipeline with the existing well chamber according to claim 3, wherein: and the inner walls of the well wall of the auxiliary well and the well shaft of the auxiliary well are provided with corresponding climbing ladders up and down.

7. A method of constructing a supplementary well structure in which a newly constructed pipe is connected to an existing well chamber according to any one of claims 1 to 6, comprising: the construction method comprises the following steps:

the method comprises the following steps: constructing a pit supporting structure of the auxiliary well, and picking a slope or steel sheet pile supporting structure according to the excavation depth;

step two: constructing an auxiliary well on the side to be connected of the current reinforced concrete well chamber;

step three: the position of a connection point is determined according to the design of water supply and drainage;

step four: drilling holes in a layered mode by adopting a water mill drill, and finally breaking the residual wall with the thickness of 40-60mm underwater once before water is supplied after all construction is finished;

step five: the construction and test detection work of all pipelines and well rooms are finished, and the water supply condition is achieved;

step six: pouring water into the auxiliary well until the water level is consistent with the current reinforced concrete well water level;

step seven: and the diver breaks the part with the residual wall thickness underwater to realize the communication between the newly-built pipeline and the current reinforced concrete well chamber.

8. The construction method as set forth in claim 7, wherein: the supporting structure comprises a steel sheet pile, a bracket and an enclosing purlin, wherein the enclosing purlin is arranged on the inner side of the steel sheet pile through the bracket, and a safety railing is arranged at the top of the steel sheet pile.

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