CN112112249A

CN112112249A - Rapid construction method for non-stop water touch connection of newly-built sewage pipeline and main pipeline

Info

Publication number: CN112112249A
Application number: CN202010968320.1A
Authority: CN
Inventors: 王震; 范春野; 韩雷; 李明; 李慧峰; 胡腾云
Original assignee: BCEG Civil Engineering Co Ltd
Current assignee: BCEG Civil Engineering Co Ltd
Priority date: 2020-09-15
Filing date: 2020-09-15
Publication date: 2020-12-22
Anticipated expiration: 2040-09-15
Also published as: CN112112249B

Abstract

A method for quickly constructing the sewage pipeline to be newly built in a way of colliding with a main pipeline without stopping water includes such steps as using prefabricated open caisson as the inspection well where the new pipeline is collided with the large pipeline, sealing the bottom and holes of open caisson, arranging lifting points on the pipeline, cutting the pipeline by rope saw, and lifting the cut pipeline. The invention is suitable for the collision and connection of a newly built sewage pipeline and a running sewage pipeline under the condition of not stopping water, and has certain social and economic benefits.

Description

Rapid construction method for non-stop water touch connection of newly-built sewage pipeline and main pipeline

Technical Field

The invention relates to the technical field of municipal engineering pipeline construction, in particular to a quick construction method for non-stop water touch connection of a newly-built sewage pipeline and a main pipeline.

Background

In newly-built sewer line construction, newly-built pipeline and the butt joint of the main pipeline in service are the more common condition in the pipeline work progress, the pipeline that has operated this moment is in the state of leading to water, if stop the main pipeline operation and come to construct the water outage of must leading to the fact the certain limit, if the time overlength of cutting off the water then can be to nearby resident, the production life of enterprise causes the influence, and the pipe diameter of cutting off the water is big more, the operation of resumeing water is also difficult more, the pipeline of cutting off the water supply range must not effectively wash, still will bring certain quality of water potential safety hazard. If can bump the grafting fast with two pipelines, will reduce construction cost certainly, reduce the adverse effect to production, life on every side, also will reduce the potential safety hazard in the work progress.

Patent CN109208737A discloses a construction method for new pipe connection and original pipe plugging in large sewage pipeline relocation, which is to construct a new pipe receiving well beside an existing working well adjacent to an original sewage pipeline and chisel the well wall of the existing working well to communicate the new pipe receiving well with the existing working well, then use a temporary plugging gate plate to temporarily plug the original sewage pipe in the existing working well, a diver goes into the well and plugs the original sewage pipeline at the downstream position of the temporary plugging gate plate with masonry stone, and pour underwater concrete between the temporary gate valve and the plug. Although the method can effectively complete the butt joint of new pipelines, water is inevitably cut off in the construction process, and a diver has high difficulty in launching operation and certain safety risk.

The existing touch construction method has two types, the first method is to stop the water supply of the existing pipeline for touch construction, because a large amount of toxic and harmful gas exists in the pipeline and the pipeline belongs to limited space operation, the safety risk is high, and the local water cut-off in a large pipeline is difficult to realize if an overtaking mode is adopted. The second method is the frogman underwater breaking operation, in a large pipeline, due to the fact that the pipeline water volume and flow velocity are large, visibility is low and the like, the frogman underwater operation difficulty is large, safety risk is high, construction uncertainty is increased, and construction period cannot be guaranteed invisibly.

Disclosure of Invention

The invention provides a quick construction method for non-stop water touch connection of a newly-built sewage pipeline and a main pipeline aiming at the existing problems.

The technical scheme of the invention is as follows: a quick construction method for non-stop water touch connection of a newly-built sewage pipeline and a main pipeline specifically comprises the following steps:

step 1: excavating a working pit to the position of the main pipeline, arranging an operation platform for further descending at the bottom of the working pit, and stabilizing the main pipeline;

step 2: preparing a multi-section prefabricated open caisson, wherein the open caisson at the lowest section corresponds to a main pipeline and a new pipeline and is reserved with an inverted U-shaped clamping groove and a new pipeline opening;

and step 3: hoisting the sinking well at the lowest section to sink along the wall of the working pit, and then sequentially hoisting the rest sinking wells to be in butt joint with the previous sinking well;

and 4, step 4: carrying out compaction grouting reinforcement treatment on the bottom of the sunk well cutting edge of the sunk well, sealing the bottom of the working pit, and casting a bottom plate on the upper surface of the bottom of the working pit by using impervious concrete;

and 5: plugging a gap at the contact part of the inverted U-shaped clamping groove and the main pipeline, and simultaneously performing touch construction of a new pipeline and the open caisson;

step 6: after the new pipeline is in collision joint with the open caisson, a laser cutting machine is adopted to cut the pipeline, a pipe of the cut part is lifted out, and the operating platform is dismantled.

Further, in step 1, install the detachable support frame that prevents operation platform lateral wall soil layer slump on the operation platform inner wall, firm the processing specifically is: the main pipeline that adopts crane and suspender to dig out carries out vertical hoist and mount to it stably, and convenient and fast just uses manpower and materials sparingly.

Further, in the step 2, an asphalt protective layer is arranged on the inner surface of the inverted U-shaped clamping groove,

the inner walls of two sides of the inverted U-shaped clamping groove are provided with movable anti-corrosion heat preservation layers, an annular space is reserved between the anti-corrosion heat preservation layers and the asphalt protective layer, the anti-corrosion heat preservation layers are fixedly connected with the inner wall of the asphalt protective layer through a group of springs in the annular space, the bottom of the annular space is provided with a reserved through hole,

the spring air cushion for reducing the pressure of the main pipeline is arranged at the top in the inverted U-shaped clamping groove, a storage bin at the bottom in the spring air cushion is filled with cement-based slurry containing an expanding agent, the setting time of the cement-based slurry is 1.5-2 hours, liquid discharging ports are arranged at two sides of the storage bin,

the bottom of the inverted U-shaped clamping groove is provided with a damping plate, a groove is embedded on the protective layer at the lower part of the inverted U-shaped clamping groove,

the anticorrosion insulating layer in the structure is made of foaming materials, so that the main pipeline can be effectively protected and prevented from being extruded and deformed by the lowered open caisson; the spring air cushion is extruded to enable the cement-based slurry which is pre-filled in the storage bin and contains the expanding agent to flow into the annular space through the liquid outlet, manual operation is not needed, the safety degree is greatly improved, and time and labor are saved to achieve a certain economic effect.

Further, in step 2, in the prefabricated open caisson process, the bottom of the main pipeline in operation is reinforced by using double-slurry grouting, the main pipeline and the open caisson are prevented from sinking in the bottom sealing process of the open caisson, and then grouting is waited to reach the specified strength.

Further, in step 3, the welding is installed the rectangle steel sheet on the inside wall of new pipeline entrance to a cave, be equipped with a plurality of fastener on the rectangle steel sheet, the rectangle steel sheet with the fixed stagnant water rubber slab that is equipped with between the fastener, stagnant water rubber slab is outstanding slightly in the new pipeline entrance to a cave of reserving, groundwater and silt seepage pollution corrosion pipeline when preventing the new pipeline butt joint.

Further, in step 5, after the construction of the new pipeline is completed, cement mortar is used for wrapping the whitewash, and meanwhile, ultraviolet curing repair is used for reinforcing and sealing all interfaces of the main pipeline and the new pipeline.

Further, in step 6, a cutting motor is arranged above a cross beam at the top of the laser cutting machine, the cross beam is provided with a chute, a slide block capable of enabling the cutting motor and a ball screw to horizontally slide is arranged in the chute, an output shaft of the cutting motor penetrates through the slide block to be connected with the ball screw, a nut is sleeved outside the ball screw, a laser cutter is fixedly connected to one side of the nut, a laser generator is arranged at one end of the laser cutter, and the other end of the laser cutter is connected with a fixed sleeve arranged on a fixed rod in a connecting mode through a telescopic;

accessible land control reaches the purpose of cutting appointed pipeline position, does not receive the influence of pipeline size, has effectively improved the scope and the precision of cutting, has improved the efficiency of pipeline cutting, and need not frogman underwater operation, and convenient and fast has shortened the time limit for a project greatly.

Further, in step 6, fine sand is used for tamping the periphery of the working pit at the top of the open caisson after construction is finished, and a steel fiber well cover is arranged above the open caisson.

The invention has the beneficial effects that:

the invention provides a rapid construction method for non-water-stop butt joint of a newly-built sewage pipeline and a main pipeline, which solves the problem of how to safely and rapidly butt joint the newly-built pipeline and an already-operated pipeline under the condition of non-water-stop, does not need to stop water of the existing pipeline in the operation process, reduces the construction cost and adverse effects on surrounding production and life, simultaneously ensures that the butt joint work can be rapidly completed in time, does not need frogman underwater operation, eliminates corresponding potential safety hazards, greatly shortens the butt joint construction period of the two pipelines, is also provided with a water stop device suitable for the opening of a sinking well pipeline, can effectively prevent underground water and silt from flowing into a sinking well, improves the cutting mode of the underwater pipeline, improves the cutting range and precision, replaces the traditional sinking well with a multi-section sinking well, has safer operation and high stability, has high construction speed, can ensure the butt joint construction period, and the safety is guaranteed, the economic effect is good, and the influence is small.

Drawings

FIG. 1 is a schematic cross-sectional view of an inspection well;

FIG. 2 is a schematic plan view of an inspection well;

FIG. 3 is a schematic diagram of the angle of the open caisson in a slant direction;

FIG. 4 is a schematic view of a new pipe orifice;

FIG. 5 is a side view of a new pipe orifice;

FIG. 6 is a schematic view of a laser cutting machine;

fig. 7 is a schematic structural view of an inverted U-shaped card slot.

Wherein, 1-open caisson, 11-inverted U-shaped clamping groove, 111-asphalt protection layer, 112-anticorrosion heat preservation layer, 113-spring air cushion, 114-storage bin, 115-damping plate, 116-reserved through hole, 117-liquid discharge port, 118-annular space, 12-new pipeline opening, 121-rectangular steel plate, 122-fastening device, 123-water-stop rubber plate, 13-compaction grouting, 14-double-liquid grouting, 15-quick-setting concrete, 16-impervious concrete, 17-open caisson cutting edge angle, 2-main pipeline, 3-new pipeline, 4-working pit, 41-medium fine sand, 42-steel fiber well cover, 5-operation platform, 51-detachable support frame, 6-laser cutting machine, 61-cutting motor, 62-beam, 63-ball screw, 64-nut, 65-laser cutter, 66-fixing sleeve, 67-fixing rod, 68-sliding block and 69-telescopic rod.

Detailed Description

Construction element preparation

1) As shown in fig. 6, in the laser cutting machine 6, a cutting motor 61 is arranged above a cross beam 62 at the top of the laser cutting machine 6, the cross beam 62 is provided with a sliding chute, a sliding block 68 capable of enabling the cutting motor 61 and a ball screw 63 to horizontally slide is arranged in the sliding chute, an output shaft of the cutting motor 61 passes through the sliding block 68 to be connected with the ball screw 63, a nut 64 is sleeved outside the ball screw 63, a laser cutter 65 is fixedly connected to one side of the nut 64, a laser generator is arranged at one end of the laser cutter 65, and the other end of the laser cutter is connected with;

2) an inverted U-shaped clamping groove 11, as shown in fig. 7, an asphalt protective layer 111 is arranged on the inner surface of the inverted U-shaped clamping groove 11, movable anticorrosive and insulating layers 112 are arranged on the inner walls of two sides of the inverted U-shaped clamping groove 11, an annular space 118 is reserved between the anticorrosive and insulating layers 112 and the asphalt protective layer 111, the anticorrosive and insulating layers 112 are fixedly connected with the inner wall of the asphalt protective layer 111 through a group of springs in the annular space 118, a reserved through hole 116 is arranged at the bottom of the annular space 118, a spring air cushion 113 for reducing the pressure of the main pipeline 2 is arranged at the top in the inverted U-shaped clamping groove 11, a storage bin 114 at the bottom in the spring air cushion 113 is filled with cement-based slurry containing an expanding agent, liquid discharge ports 117 are arranged on two sides of the storage bin 114, a damping;

the components are prefabricated for use in a subsequent construction method, wherein the cutting motor 61 is a commercially available rotating motor, and the shape and structure of the cutting motor are adjusted to meet the installation requirements of the device.

Construction method

Step 1: as shown in fig. 1-3, the working pit 4 is excavated downwards to the position of the main pipeline 2, the soil in the working pit 4 is removed, the conveying space from the open caisson 1 to the main pipeline 2 is reserved, meanwhile, an operating platform 5 for the constructor to further descend is built at the bottom of the working pit 4 by the operator, and a detachable support frame 51 for preventing the soil layer on the side wall of the operating platform 5 from collapsing is installed on the inner wall of the operating platform 5. Stabilizing the side slope of the working pit 4, namely vertically hoisting and stabilizing the excavated main pipeline 2 in a crane and sling mode;

step 2: as shown in fig. 1-3 and fig. 7, the open caisson 1 is prefabricated in sections, an inverted U-shaped clamping groove 11 is reserved at a position corresponding to a main pipeline 2 of the lowest prefabricated open caisson 1, so that the open caisson 1 can sink without damaging the main pipeline 2, and a new pipeline hole 12 is reserved at a position corresponding to a new pipeline 3 of the lowest prefabricated open caisson 1; the bottom of a main pipeline 2 in operation is reinforced by double-liquid grouting 14 in the process of prefabricating the open caisson 1, the double-liquid grouting 14 is formed by alternately injecting water glass and calcium chloride solution, the two solutions react rapidly to generate silica gel and calcium silicate gel, the functions of cementing and filling pores are achieved, the strength and the bearing capacity of bottom soil are improved, the main pipeline 2 and the open caisson 1 are prevented from sinking in the bottom sealing process of the open caisson 1, then, the grouting is waited to reach the specified strength, cement-based slurry containing expanding agents is injected into liquid discharge ports 117 on two sides of a storage bin 114, and the liquid discharge ports 117 are blocked.

And step 3: as shown in fig. 1-5 and 7, the open caisson 1 is positioned, the well body of the lowest open caisson 1 is hoisted to the installation area, the well body of the lowest open caisson 1 sinks uniformly under the action of self weight, lubricant is added to the inner wall of the inverted U-shaped clamping groove 11 and the outer wall of the main pipeline 2 in the sinking process of the lowest section open caisson 1, when the main pipeline 2 presses the spring air cushion 113, the cement-based slurry in the storage bin 114 is pressed to open the liquid discharge ports 117 at two sides, the cement-based slurry is discharged into an annular space 118 reserved between the anti-corrosion heat-insulation layer 112 and the asphalt protective layer 111 through the liquid discharge ports 117, thereby promote anticorrosive heat preservation 112 and outwards remove and laminate mutually with trunk line 2, if have unnecessary cement base thick liquid then open reservation through-hole 116 and discharge, the cement base thick liquid that contains the expanding agent after 1.8 hours inflation and solidify, make trunk line 2 closely laminate with anticorrosive heat preservation 112, insert the steel sheet in the recess after the bottom open caisson 1 sinks to the place in place. The subsequent open caisson 1 is placed at the top of the lowest open caisson 1 which is sunk below the ground surface, so that the multiple sections of open caisson 1 are continuously sunk underground to form the open caisson 1 wall until the open caisson 1 is sunk to the designed elevation; after the open caisson 1 sinks to the design elevation, an operator welds and installs the rectangular steel plate 121 on the inner side wall of the new pipeline opening 12 through the operation platform 5, the rectangular steel plate 121 is provided with a plurality of fastening devices 122, a water stop rubber plate 123 is fixedly arranged between the rectangular steel plate 121 and the fastening devices 122, the water stop rubber plate 123 slightly protrudes out of the new pipeline opening 12, and the corrosion to the pipeline caused by stratum water leakage during the butt joint of the new pipeline is prevented.

And 4, step 4: as shown in figure 1, the bottom of an open caisson cutting edge 17 of an open caisson 1 is subjected to compacting grouting 13 for reinforcement, an SYB50 type grouting pump is adopted for grouting slurry, after grouting reaches the design strength, rapid-setting concrete 15 is adopted for bottom sealing of the bottom of the open caisson, the rapid-setting concrete 15 is uniformly vibrated and compacted during bottom sealing, the filling under the cutting edge 17 is ensured, the bottom sealing is in place at one time, the rapid-setting concrete 15 is a red star I type rapid-setting agent, and aluminum oxide clinker, sodium carbonate and quicklime are mixed according to the mass 1: 1: 0.5, the mixing amount is 3.8 percent of the mass of the cement, then the impervious concrete 16 is adopted to cast the bottom plate, the impervious concrete 16 is C40 impervious concrete, the water cement ratio is 0.44, the sand rate is 35 percent, and the dosage of the additive in each cubic meter of concrete is 24.5 kg;

and 5: as shown in fig. 1 and 2, a gap between the contact part of the inverted U-shaped clamping groove 11 and the main pipeline 2 is blocked, and meanwhile, the collision construction of a new pipeline 3 and the open caisson 1 is carried out; and after the construction of the new pipeline 3 is finished, coating the whitewash by using cement mortar, and simultaneously reinforcing and sealing all the joints of the main pipeline 2 and the new pipeline 3 by using ultraviolet curing repair.

Step 6: as shown in fig. 1, 3 and 6, after new pipeline 3 and open caisson 1 bump and connect the completion, at 2 tops of trunk line welding installation two lugs, adopt laser cutting machine 6 to cut trunk line 2, set up crossbeam 62 at 1 top opening part of open caisson, transfer laser cutting machine 61 to the trunk line 2 department that needs the cutting through ball screw 63, begin to carry out the cutting operation, drive slider 68 through telescopic link 69 during the cutting and promote ball screw 63 and the 6 horizontal motions of laser cutting machine, laser cutting machine 6 is at the vertical motion of cutting motor 61 effect, thereby realize the cutting operation to trunk line 2, hang out cutting part tubular product, demolish operation platform 5. After the construction is finished, the fine sand 41 is used for tamping the periphery of the working pit 4 at the top of the open caisson 1, the fineness modulus mu f of the fine sand 41 can be within 2-2.5, and a steel fiber well cover 42 is arranged above the open caisson 1.

Claims

1. A quick construction method for non-stop water touch connection of a newly-built sewage pipeline and a main pipeline is characterized by comprising the following steps:

step 1: excavating a working pit (4) to the position of the main pipeline (2), arranging an operating platform (5) for further descending at the bottom of the working pit (4), and stabilizing the main pipeline (2);

step 2: preparing a multi-section prefabricated open caisson (1), wherein the position of the lowermost open caisson (1) corresponding to the main pipeline (2) and the new pipeline (3) is correspondingly reserved with an inverted U-shaped clamping groove (11) and a new pipeline opening (12);

and step 3: hoisting the lowest section of the open caisson (1) to sink along the wall of the working pit (4), and then sequentially hoisting the rest open caisson (1) to be butted with the previous section of the open caisson (1);

and 4, step 4: carrying out compaction grouting (13) reinforcement treatment on the bottom of an open caisson cutting edge (17) of the open caisson (1), sealing the bottom of the working pit (4), and casting a bottom plate on the upper surface of the bottom of the working pit (4) by using impervious concrete (16);

and 5: plugging a gap at the contact part of the inverted U-shaped clamping groove (11) and the main pipeline (2), and simultaneously performing the collision construction of the new pipeline (3) and the open caisson (1);

step 6: after the new pipeline (3) is in contact connection with the open caisson (1), a laser cutting machine (6) is used for cutting the pipeline, the pipe of the cutting part is lifted out, and the operating platform (5) is detached.

2. The method for rapidly constructing a newly-built sewage pipeline without stopping water and colliding with a main pipeline in accordance with claim 1, wherein in step 1, a detachable support frame (51) for preventing soil collapse on the side wall of the operation platform (5) is installed on the inner wall of the operation platform (5), and the stabilizing treatment is specifically: the main pipeline (2) dug out is vertically hoisted stably by adopting a crane and a sling.

3. The method for fast constructing a newly-built sewage pipeline without stopping water collision with a main pipeline according to claim 1, wherein in step 2, an asphalt protective layer (111) is arranged on the inner surface of the inverted U-shaped clamping groove (11),

the inner walls of two sides of the inverted U-shaped clamping groove (11) are provided with movable anti-corrosion heat-insulation layers (112), an annular space (118) is reserved between the anti-corrosion heat-insulation layers (112) and the asphalt protective layer (111), the anti-corrosion heat-insulation layers (112) are fixedly connected with the inner wall of the asphalt protective layer (111) through a group of springs in the annular space (118), a reserved through hole (116) is arranged at the bottom of the annular space (118),

a spring air cushion (113) used for reducing the pressure of the main pipeline (2) is arranged at the inner top of the inverted U-shaped clamping groove (11), a storage bin (114) at the inner bottom of the spring air cushion (113) is filled with cement-based slurry containing an expanding agent, liquid discharge ports (117) are arranged at two sides of the storage bin (114),

the bottom of the inverted U-shaped clamping groove (11) is provided with a damping plate (115), and a groove is embedded in a protective layer at the lower part of the inverted U-shaped clamping groove (11).

4. The rapid construction method of the non-stop water collision connection of the newly-built sewage pipeline and the main pipeline according to the claim 1 is characterized in that in the step 2, the bottom of the main pipeline (2) in operation is reinforced by using double-fluid grouting (14) during the process of prefabricating the open caisson (1), and then the grouting is waited to reach the designated strength.

5. The rapid construction method of claim 1, wherein in step 3, a rectangular steel plate (121) is welded to the inner side wall of the new pipe opening (12), a plurality of fastening devices (122) are disposed on the rectangular steel plate (121), a water-stopping rubber plate (123) is fixedly disposed between the rectangular steel plate (121) and the fastening devices (122), and the water-stopping rubber plate (123) slightly protrudes from the reserved new pipe opening (12).

6. The rapid construction method of the non-stop water collision connection between the newly-built sewage pipeline and the main pipeline according to claim 1, characterized in that in step 5, after the construction of the new pipeline (3) is completed, cement mortar is used to wrap the whitewash, and at the same time, ultraviolet curing repair is used to reinforce and seal all the joints between the main pipeline (2) and the new pipeline (3).

7. The rapid construction method of claim 1, wherein in step 6, a cutting motor (61) is disposed above the top beam (62) of the laser cutting machine (6), the beam (62) has a sliding slot, a sliding block (68) for horizontally sliding the cutting motor (61) and the ball screw (63) is disposed in the sliding slot, an output shaft of the cutting motor (61) passes through the sliding block (68) to connect with the ball screw (63), a nut (64) is sleeved outside the ball screw (63), a laser cutter (65) is fixedly connected to one side of the nut (64), one end of the laser cutter (65) is provided with a laser generator, and the other end of the laser cutter (65) is connected to a fixing sleeve (66) sleeved on the fixing rod (67) through a telescopic rod (69).

8. The rapid construction method of the new sewer pipe without stopping water from the main pipeline according to claim 1, characterized in that in step 6, fine sand (41) is used to tamp the periphery of the working pit (4) on the top of the open caisson (1) after the construction is completed, and a steel fiber well cover (42) is arranged above the open caisson (1).