CN108222220B - Construction method for connecting new sewage pipe and old sewage pipe in displacement transformation of sewage pipe - Google Patents

Abstract

The invention discloses a construction method for connecting new sewage pipes and old sewage pipes in shifting transformation of sewage pipes, which comprises the steps of connecting a side PCCP pipe with an original three-sewage communicating pipe, and connecting the PCCP pipe with a square canal three-sewage communicating pipe, and connecting adjacent PCCP pipes comprising an inspection well, wherein the sectional construction is carried out simultaneously or step by step. According to the practical condition that the new and old sewage communicating pipes intersect in the plane, the non-intersecting section, the inspection well and the Bao Jing are firstly constructed in the whole foundation pit, and then the cutting construction process of the new and old sewage communicating pipes is carried out, so that the construction process is simple and convenient, and the obtained new and old sewage pipe connecting structure is stable and suitable for popularization and application.

Description

A construction method for connecting new and old sewage pipes in sewage pipe relocation and reconstruction

Technical field

The invention belongs to the technical field of building construction, and specifically relates to a construction method for connecting new and old sewage pipes in the displacement and reconstruction of sewage pipes with simple structure, convenient construction and good safety performance.

Background technique

For fully enclosed underground construction sections, sometimes it is necessary to relocate and transform the connecting pipes for the three wastewater sources. The local new connected pipes for the three pollutants and the old connected pipes for the three pollutants need to be connected. However, due to the different heights of the local connecting pipes, even the connecting pipes The shapes of the pipes are different, and the pipes are covered with deep soil and the sewage is continuously discharged, which brings major problems to the construction progress and greatly affects the construction progress and quality.

Contents of the invention

In view of the above-mentioned problems existing in the prior art, the object of the present invention is to provide a construction method for connecting new and old sewage pipes in sewage pipe displacement and reconstruction with simple structure, convenient construction and good safety performance.

The construction method for connecting old and new sewage pipes in the relocation and reconstruction of sewage pipes includes the construction of connecting the side PCCP pipes to the original three-sewage connecting pipes, the PCCP pipes and the square canal three-sewage connecting pipes, and the adjacent PCCP pipes containing inspection wells. For connection construction, segmented construction shall be carried out simultaneously or step by step: specifically:

1) According to the design drawings, excavate the pipeline foundation pit at the corresponding location and install the first PCCP pipe, the second PCCP pipe and the third PCCP pipe, and the first PCCP pipe is placed obliquely on the side of the original three-sewage connecting pipe, and the first PCCP pipe Place it on one side of the connection end of the square canal's three-sewage connecting pipe, and place the second PCCP pipe between the first PCCP pipe and the third PCCP pipe;

2) Construction of connecting the side PCCP pipe and the original three pollution connecting pipes

201) First perform dewatering treatment on the original three-sewage connecting pipe, then construct the shaft and square well of the first inspection well outside the third PCCP pipe, and then connect the third PCCP pipe and the original three-sewage connecting pipe inside the square-bundled well. Install water-stopping steel plates at the connection locations, on the circumference of the third PCCP pipe, and around the original three-sewage connecting pipe. At the same time, angular pre-cut steel plates are pre-embedded at the connection between the square package well, the third PCCP pipe, and the abandoned section of the original three-sewage connecting pipe. Buried steel plates, straight embedded steel plates are embedded between the square well and the connection section of the original three pollution connecting pipes;

202) According to the design requirements, the side plates of the original three pollution connecting pipes are removed to form a connection port, and a reinforcing steel plate is installed on the connection port;

203) Pour C15 plain concrete into the abandoned section of the original three-sewage connecting pipe and pour it to the bottom of the top plate of the square-wrapped well;

204) Connect the bottom of the third PCCP pipe to the bottom of the connection port of the original three-sewage connecting pipe through the bottom plate, pour the C10 plain concrete layer and the C30 reinforced concrete base layer, then pour the C15 plain concrete above the C30 reinforced concrete base layer, and pour To the bottom of the roof of the square-clad well, C15 cast concrete is formed, and the gap between the third PCCP pipe, the original three-sewage connecting pipe and the square-clad well forms a transitional connection section;

3) Construction of adjacent PCCP pipe connections including inspection wells

301) First, construct the bottom plate and buttress 25 of the second inspection well at the connection between the first PCCP pipe and the second PCCP pipe;

302) Make a hole in the second steel pipe and set up a second steel flange panel to form a manhole. Place the first steel pipe and steel pipe in sequence between the first PCCP pipe and the second PCCP pipe. The short pipe and the second steel pipe, and the manhole on the second steel pipe is located in the center of the second inspection well. The construction personnel enter the pipe through the manhole and connect the first PCCP pipe end to the first steel pipe socket, and the second PCCP pipe end The head is socket-connected to one end of the second steel pipe, and the other end of the first steel pipe and the other end of the second steel pipe are welded and connected to both ends of the steel short pipe respectively, and a steel collar is attached to the outside of the steel short pipe for reinforcement;

303) Construct C25q reinforced concrete on the outer walls of the first PCCP pipe, the first steel pipe, the steel collar, the second steel pipe and the second PCCP pipe to form a reinforced concrete square package, cover and fix the connections, and at the same time pour the second steel pipe buttress;

4) Construction of connection between PCCP pipe and square canal three wastewater connecting pipes

401) For the places where the second PCCP pipe, transitional connecting steel pipe and square canal and three wastewater connecting pipes need to be cut over, drainage ditches should be set up around the foundation pit, and water collection wells should be set up at the lowest part of the foundation pit. Dewatering should be carried out for 8-12 days around the cutover;

402) The foundation pit at the intersection of the new and old sewage connecting pipes shall be graded 1:0.8, leaving a construction surface of 1m on the side slope, and a water collection pit shall be built at the deepest part. The slope shall be protected by film covering method. After excavation, Nylon colored strips or thickened plastic film are laid on the slope, and woven earth bags or brick masonry are used at the top, platform and foot of the slope. A 40*40cm drainage ditch is set up around the foundation pit, and A water collection well with a depth of 60cm is set up at the lowest point of the foundation pit. High-grade reinforced concrete foundations and buttresses are poured under the second PCCP pipe 16 and the inspection well. In order to ensure smooth takeover, the dewatering of the foundation pit is carried out using a φ600 deep well, and water pumps are used to uniformly drain it to the foundation. The drainage ditch beside the pit merges into the municipal drainage system, and precipitation will stop after the concrete structure construction is completed and the earthwork backfilling is completed;;

403) According to the design requirements, one end of the transitional connection steel pipe is socket-connected to the square canal three-sewage connecting pipe, and the other end is welded and connected to the second PCCP pipe, and a sealing structure is constructed at the socket connection.

The described construction method for connecting old and new sewage pipes in sewage pipe shifting and reconstruction is characterized by the fact that in step 4), the second PCCP pipe, the transitional connecting steel pipe and the square canal three sewage connecting pipes are all provided with brick piers at the bottom. Reinforcement effect.

The described construction method for connecting old and new sewage pipes in the relocation and transformation of sewage pipes is characterized by opening a 40*40cm drainage ditch around the foundation pit in step 4), and setting up a 60cm deep water collection well at the lowest part of the foundation pit. , the second PCCP pipe and inspection shaft were poured with high-grade reinforced concrete foundations and buttresses to ensure smooth takeover.

The described construction method for connecting old and new sewage pipes in the relocation and reconstruction of sewage pipes is characterized in that the dewatering of the foundation pit in step 4) is carried out using a φ600 deep well, and the water is uniformly pumped to the drainage ditch beside the foundation pit and merged into municipal drainage. System, precipitation will stop after the concrete structure construction is completed and the earthwork backfilling is completed.

The described construction method for connecting new and old sewage pipes in the relocation and transformation of sewage pipes is characterized by turning on a high-power blower to blow the connecting pipe during the cutover process in step 4), and using continuous blowing to weaken the working surface. Density of toxic gases.

The described construction method for connecting old and new sewage pipes in sewage pipe relocation and reconstruction is characterized by the following construction process of cutting over the second PCCP pipe and the square canal three sewage connecting pipes in step 4):

1) Dig the square canal and the three-sewage connecting pipe at the designed interface, cut and remove the excess square canal segments, and then pour the concrete steel pipe foundation;

2) Remove the sludge in the interface section of the square canal's three-sewage connecting pipe, clean the four walls of the square canal's three-sewage connecting pipe, and then insert one end of the transitional connecting steel pipe into the square canal's three-sewage connecting pipe;

3) Place the first cork formwork and the second cork formwork into the corresponding positions between the transitional connecting steel pipe and the square canal three-sewage connecting pipe and match them closely;

4) Fill the first epoxy concrete and the second epoxy concrete in the space outside the first cork formwork and the second cork formwork between the transition connecting steel pipe and the square channel three-sewage connecting pipe, respectively, and pre-embed grouting pipes in the four corners of the space;

5) After the epoxy concrete reaches strength, pour elastic epoxy grouting material into the space between the first cork formwork and the second cork formwork through the grouting pipe under a pressure not exceeding 0.4MPa;

6) After the elastic epoxy grouting material in step 5) is cured, the grouting pipe is removed and the reserved hole of the grouting pipe is sealed and leveled with resin mortar;

7) Inject polymer mortar into the space outside the first epoxy concrete, and inject sealing paste into the space outside the second epoxy concrete; after the polymer mortar reaches the design strength, paint the exposed surface of the transition connecting steel pipe with epoxy thickening paint.

The construction method for connecting new and old sewage pipes in the relocation and transformation of sewage pipes is characterized in that the side PCCP pipe and the original three-sewage connecting pipe are connected to obtain a connection structure between the side PCCP pipe and the original three-sewage connecting pipe. The structure includes The third PCCP pipe and the original three-sewage connecting pipe are located on the side of the original three-sewage connecting pipe. The connection between the third PCCP pipe and the original three-sewage connecting pipe is equipped with a square well. The side of the original three-sewage connecting pipe is connected to the third PCCP pipe. The wall plate at the connection of the three PCCP pipes was removed to form a connection port. A reinforced steel plate was installed at the bottom of the connection port. The gap between the square package well and the third PCCP pipe and the abandoned section of the original three-sewage connecting pipe located in the square package well were poured with C15 pouring materials. Plain concrete, the space formed between two pieces of C15 cast plain concrete is a transitional connection section. The transitional connection section connects the third PCCP pipe and the original three-sewage connecting pipe connection section, so that the sewage is transferred from the original three-sewage connecting pipe to the third PCCP On the pipe, a water-stop steel plate is installed at the connection between the square package well, the original three pollution connecting pipes and the third PCCP pipe, and the first inspection well is installed on the transitional connection section.

The described construction method for connecting old and new sewage pipes in the relocation and transformation of sewage pipes is characterized in that the connection construction between PCCP pipes containing inspection wells obtains a connection structure between PCCP pipes containing inspection wells, and the structure includes The first PCCP pipe and the second PCCP pipe are provided with a second inspection well between the first PCCP pipe and the second PCCP pipe. The first steel pipe, the steel short pipe and the For the second steel pipe, one end of the first steel pipe is socket-connected to the first PCCP pipe, one end of the second steel pipe is socket-connected to the second PCCP pipe, and the other end of the first steel pipe and the other end of the second steel pipe are welded to both ends of the short steel pipe respectively. Connection, a second steel flange panel is provided on either the first steel pipe or the second steel pipe to form a manhole. The manhole is located in the second inspection well. The first steel pipe, the second steel pipe and the steel short pipe are outside A steel collar for reinforcement is provided, and a reinforced concrete square package is provided on the outer walls of the first PCCP pipe, the first steel pipe, the steel collar, the second steel pipe and the second PCCP pipe.

The construction method for connecting new and old sewage pipes in the relocation and reconstruction of a sewage pipe is characterized in that the connection construction of the PCCP pipe and the square channel three-sewage connecting pipe obtains a connection structure of the PCCP pipe and the square channel three-sewage connecting pipe, and the structure includes a second PCCP pipe, a transition connection steel pipe and the square channel three-sewage connecting pipe, one end of the transition connection steel pipe is connected to the second PCCP pipe, and the other end of the transition connection steel pipe is inserted into the square channel three-sewage connecting pipe, and a sealing structure is provided between the transition connection steel pipe and the square channel three-sewage connecting pipe.

By adopting the above technology, compared with the prior art, the beneficial effects of the present invention are as follows:

1) The present invention adopts a transition connecting pipe for connecting the new sewage connecting pipes and the new raw sewage pipe. One end of the transition connecting pipe is connected to the new PCCP connecting pipe by a coiled short pipe, and the other end is matched with the square channel three-way connecting pipe for plugging. The present invention is used for connecting the new raw sewage pipe when the three-sewage connecting pipe is relocated and reconstructed. Connecting pipes of different structures are simply and effectively connected through different transition connectors. The structure is simple, the connection is stable, the sealing is good, and the use is safe;

2) The present invention sets a sealing structure between the transitional connecting pipe and the square channel three-way sewage connecting square pipe. The sealing structure includes two cork templates to serve as a water stop. According to the characteristics of the sewage pipe, the present invention also provides a square joint The elastic epoxy materials, epoxy concrete, polymer mortar and sealing ointment between the square pipes connected to the raw sewage can not only play a sealing role, but also have anti-corrosion and waterproof effects, greatly extending the service life of the sewage pipes. Adapt it to various usage environments;

3) Based on the actual situation that the new and old three pollution connecting pipes intersect in the plane, the present invention first constructs non-intersecting sections, inspection wells and package wells in the entire foundation pit, and then carries out the cutting and splicing construction process of the new and old three pollution connecting pipes. The construction process is simple and convenient, and the resulting connection structure of the old and new sewage pipes is stable and suitable for promotion and application;

4) The present invention uses a transitional connecting pipe to connect the new sewage connecting pipe and the original square canal three-sewage connecting pipe. When the PCCP pipe is inserted into the original sewage connecting pipe from the side, the side opening of the original sewage connecting pipe is used to connect to the PCCP pipe, and an additional Since the invention is a low-pressure pipe for the square well, it is necessary to install an inspection well. Three sections of steel pipes are used to connect the adjacent PCCP pipes with the inspection well and are reinforced with steel collars. At the same time, the square well is sealed and reinforced. Different transition joints connect connecting pipes of different structures simply and effectively. They have simple structure, stable connection, good sealing and safe use.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is a schematic structural diagram of the present invention;

Figure 2 is a schematic structural diagram of the present invention;

Figure 3 is a schematic structural diagram of the A-A section in Figure 2;

Figure 4 is a schematic structural diagram of the present invention;

Figure 5 is a schematic cross-sectional structural diagram of the present invention;

Figure 6 is a schematic structural diagram of the present invention;

Figure 7 is an enlarged structural diagram of the sealing structure.

In the figure: 1-the third PCCP pipe, 2-angular embedded steel plate, 3-C15 cast plain concrete, 4-the first inspection well, 401-C30 reinforced mortar top, 402-round well cover, 5-original three-sewage connecting pipe, 6-waterstop steel plate, 7-straight embedded steel plate, 8-square well, 801-top plate, 9-transition connection section, 10-medium coarse sand backfill layer, 11-C10 plain concrete layer, 12-C30 reinforced concrete foundation layer, 13-the first steel flange plate, 14-connection port, 15-reinforcement steel plate, 16-the first PCCP pipe, 17-the One steel pipe, 18-steel short pipe, 19-second inspection well, 20-second steel pipe, 21-second PCCP pipe, 22-second steel flange plate, 23-steel sleeve, 24-reinforced concrete square bag, 25-pier, 26-concrete foundation, 27-square channel three-sewage connecting pipe, 28-polymer mortar, 29-first epoxy concrete, 30-first cork formwork, 31-elastic epoxy grouting material, 32-second cork formwork, 33-second epoxy concrete, 34-sealing paste, 35-grouting pipe, 36-transition connecting steel pipe.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited thereto:

As shown in Figures 1-7, when the present invention alternately constructs new and old sewage connecting pipes, the main problems encountered are the forward connection, diagonal connection of the new and old connecting pipes, the connection of the new connecting pipe through the old connecting pipe, etc. , in order to facilitate construction, the present invention has conducted corresponding research on the construction of the above connections. When the new and old sewage connecting pipes are alternately constructed, it includes the construction of several sections of PCCP pipes, original sewage connecting pipes, square canal three sewage connecting pipes, adjacent PCCP pipes The connection between the PCCP pipe and the three sewage connecting pipes of the square canal, the PCCP pipe is inserted into the original sewage connecting pipe from the side and connected to it, and there are inspection wells at the connection between adjacent PCCP pipes and the connection between the PCCP pipe and the original sewage connecting pipe from the side. The specific construction process is as follows:

The present invention is a construction method for connecting old and new sewage pipes in sewage pipe relocation and reconstruction, including the construction of connecting the side PCCP pipe with the original three-sewage connecting pipe, the PCCP pipe with the square canal three-sewage connecting pipe, and the adjacent PCCP including the inspection well. The construction of pipe connections shall be carried out in sections at the same time or in steps: specifically:

1) According to the design drawings, excavate the pipeline foundation pit at the corresponding location and install the first PCCP pipe 16, the second PCCP pipe 21 and the third PCCP pipe 1, and the first PCCP pipe 16 is placed obliquely on the side of the original three-sewage connecting pipe 5 , the first PCCP pipe 16 is placed on one side of the connection end of the square canal's three-sewage connecting pipe 27, and the second PCCP pipe 21 is placed between the first PCCP pipe 16 and the third PCCP pipe 1;

2) Construction of connecting the side PCCP pipe with the original three-waste connecting pipe

201) First perform dewatering treatment on the original three-sewage connecting pipe 5, then construct the shaft of the first inspection well 4 and the square-clad well 8 outside the third PCCP pipe 1, and then construct the third PCCP pipe 1 and 8 inside the square-clad well 8. Install water-stop steel plates 6 at the connection locations of the original three-sewage connecting pipe 5, the circumference of the third PCCP pipe 1, and the original three-sewage connecting pipe 5. At the same time, install water-stop steel plates 6 between the square well 8 and the third PCCP pipe 1 and the original three An angular embedded steel plate 2 is pre-buried at the connection of the abandoned section of the sewage connecting pipe 5, and a straight embedded steel plate 7 is pre-buried between the square well 8 and the connection section of the original three-sewage connecting pipe 5;

202) According to the design requirements, the side plates of the original three-pollution connecting pipe 5 are removed to form a connection port 14, and a reinforcing steel plate 15 is added to the connection port 14;

203) Pour C15 plain concrete into the abandoned section of the original three-sewage connecting pipe 5, and pour it to the bottom of the roof 801 of the square well 8;

204) Connect the bottom of the third PCCP pipe 1 to the bottom of the connection port 14 of the original three-sewage connecting pipe 5 through the bottom plate, pour the C10 plain concrete layer 11 and the C30 reinforced concrete foundation layer 12, and then pour the C15 plain concrete on the C30 reinforced concrete foundation layer 12 and pour it to the bottom of the top plate 801 of the square package well 8 to form the C15 plain concrete 3. The gap between the third PCCP pipe 1, the original three-sewage connecting pipe 5 and the square package well 8 forms a transition connection section 9;

3) Construction of adjacent PCCP pipe connections including inspection wells

301) First, construct the bottom plate and buttresses 25 of the second inspection well 19 at the connection between the first PCCP pipe 16 and the second PCCP pipe 21;

302) Make a hole in the second steel pipe 20 and set a second steel flange panel 22 to form a manhole. Place the first PCCP pipe 16 and the second PCCP pipe 21 in order. The steel pipe 17, the steel short pipe 18 and the second steel pipe 20, and the manhole on the second steel pipe 20 is located in the center of the second inspection well 19. The construction personnel enter the pipe through the manhole and connect the end of the first PCCP pipe 16 to the first The steel pipe 17 is socket-connected, the end of the second PCCP pipe 21 is socket-connected to one end of the second steel pipe 20, the other end of the first steel pipe 17 and the other end of the second steel pipe 20 are respectively welded and connected to the two ends of the steel short pipe 18, and at The steel short pipe 18 is coated with a steel collar 23 for reinforcement;

303) Construct C25q reinforced concrete on the outer walls of the first PCCP pipe 16, the first steel pipe 17, the steel collar 23, the second steel pipe 20 and the second PCCP pipe 21 to form a reinforced concrete square package 24, and cover and fix the connections. At the same time, the buttress 10 is poured on the second steel pipe 20;

4) Construction of connection between PCCP pipe and square channel three-sewage connecting pipe

401) For the places where the second PCCP pipe 16, the transitional connecting steel pipe 36 and the square canal three-sewage connecting pipe 27 need to be cut over, drainage ditches should be set up around the foundation pit, and a water collection well should be set up at the lowest part of the foundation pit. Dewatering should be carried out around the cutover 8- 12 days;

402) The foundation pit at the intersection of the new and old sewage connecting pipes shall be graded 1:0.8, leaving a construction surface of 1m on the side slope, and a water collection pit shall be built at the deepest part. The slope shall be protected by film covering method. After excavation, Nylon colored strips or thickened plastic film are laid on the slope, and woven earth bags or brick masonry are used at the top, platform and foot of the slope. A 40*40cm drainage ditch is set up around the foundation pit, and A water collection well with a depth of 60cm is set up at the lowest point of the foundation pit. High-grade reinforced concrete foundations and buttresses are poured under the second PCCP pipe 16 and the inspection well. In order to ensure smooth takeover, the dewatering of the foundation pit is carried out using a φ600 deep well, and water pumps are used to uniformly drain it to the foundation. The drainage ditch beside the pit merges into the municipal drainage system, and precipitation will stop after the concrete structure construction is completed and the earth backfilling is completed;

403) According to the design requirements, the square channel three-sewage connecting pipe 27 is cut. During the cutting process, a high-power blower is turned on to blow air on the connecting pipe, and the density of toxic gases on the working surface is reduced by continuous blowing. One end of the transition connection steel pipe 36 is connected to the square channel three-sewage connecting pipe 27 with a socket, and the other end is welded to the second PCCP pipe 16, and a sealing structure is constructed at the socket connection. The second PCCP pipe 16, the transition connection steel pipe 36 and the bottom of the square channel three-sewage connecting pipe 27 are all provided with brick piers for reinforcement.

Specifically, the cutover construction process of the second PCCP pipe 16 and the square canal three-sewage connecting pipe 27 is as follows:

1) Dig the square channel three-sewage connecting pipe 27 at the designed interface, cut and remove the redundant square channel segments, and then pour the concrete steel pipe foundation;

2) Remove the sludge in the interface section of the square canal three-sewage connecting pipe 27, clean the four walls of the square canal three-sewage connecting pipe 27, and then insert one end of the transitional connecting steel pipe 36 into the square canal three-sewage connecting pipe 27;

3) Place the first cork formwork 30 and the second cork formwork 32 into the corresponding positions between the transitional connecting steel pipe 36 and the square canal three-sewage connecting pipe 27 and match them closely;

4) Fill the spaces outside the first cork formwork 30 and the second cork formwork 32 between the transitional connecting steel pipe 36 and the square canal three-sewage connecting pipe 27 with the first epoxy concrete 29 and the second epoxy concrete 33 respectively, and Grouting pipes 35 are embedded in the four corners of the empty space;

5) After the epoxy concrete reaches strength, the elastic epoxy grouting material 31 is poured into the space between the first cork formwork 30 and the second cork formwork 32 through the grouting pipe 35 under a pressure not exceeding 0.4MPa;

6) After the elastic epoxy grouting material 31 in step 5 is cured, remove the grouting pipe 35 and use resin mortar to seal the reserved holes in the grouting pipe 35 flatly;

7) Inject polymer mortar 28 into the space outside the first epoxy concrete 29, and inject sealing paste 34 into the space outside the second epoxy concrete 33; after the polymer mortar 28 reaches the design strength, transition the steel pipe 36 The exposed surfaces should be painted with epoxy thickened paint.

As shown in Figures 1-3, the connection structure between the side PCCP pipe obtained by the construction of the present invention and the original three-sewage connecting pipe includes a third PCCP pipe 1 and the original three-sewage connecting pipe 5. The third PCCP pipe 1 is located in the original three-sewage connecting pipe 5. On the side, the connection between the third PCCP pipe 1 and the original three-sewage connecting pipe 5 is provided with a square well 8. The wall plate at the connection between the side of the original three-sewage connecting pipe 5 and the third PCCP pipe 1 is removed to form a connection port 14. The connection port 14 is provided with a reinforced steel plate 15 at the bottom. C15 plain concrete 3 is poured into the gap between the square package well 8 and the third PCCP pipe 1, and the abandoned section of the original three-pollution connecting pipe 5 located in the square package well 8. Two pieces of C15 concrete are poured into the gap. The space formed between the plain concrete 3 is a transitional connection section 9. The transitional connection section 9 connects the third PCCP pipe 1 and the original three-sewage connecting pipe 5, so that the sewage is transferred from the original three-sewage connecting pipe 5 to the third PCCP pipe. 1, a water-stop steel plate 6 is provided at the connection between the square package well 8 and the original three-pollution connecting pipe 5 and the third PCCP pipe 1. A first inspection well 4 is provided on the transitional connection section 9. The bottom of the third PCCP pipe 1 is There is a C10 plain concrete layer 11 and a C30 reinforced concrete base layer 12 at the top. The C15 cast concrete 3 is located above the C30 reinforced concrete base layer 12 and is poured to the bottom of the roof 801 of the square well 8. The bottom of the third PCCP pipe 1 is located at the square The outer part of the well 8 is provided with a medium-coarse sand backfill layer 10;

In order to improve the connection firmness, the present invention provides an angular embedded steel plate 2 at the connection between the square well 8 and the third PCCP pipe 1 and the abandoned section of the original three-sewage connecting pipe 5. The angular embedded steel plate 2 includes a right-angled body, and There are two pre-embedded feet arranged on the outside of the right-angled body and bent outwards. A straight embedded steel plate 7 is provided between the connecting section of the square well 8 and the original three-sewage connecting pipe 5. The straight embedded steel plate 7 includes A straight body, and two embedded feet arranged outside the straight body and bent outward; the connection section between the third PCCP pipe 1, the original three-sewage connecting pipe 5 and the square well 8 is evenly spaced A water-stopping steel plate 6 is provided at the connection between the abandoned section and the bottom of the original three-sewage connecting pipe 5 and the square well 8. On the one hand, it can stop the water angle, and on the other hand, it can improve the stability of the structure; such as As shown in the figure, the side wall of the first inspection well 4 is made of C25 plain concrete, the first inspection well 4 is provided with a first steel flange panel 13, and the upper part of the first inspection well 4 is provided with a C30 reinforced concrete roof. 401 and a circular manhole cover 402 matching the C30 reinforced concrete roof 401.

As shown in Figures 1, 4 and 5, the PCCP pipe connection structure containing the second inspection well obtained by the construction of the present invention includes a first PCCP pipe 16 and a second PCCP pipe 21, and the first PCCP pipe 16 and the second PCCP A second inspection well 19 is provided between the pipes 21. A first steel pipe 17, a steel short pipe 18 and a second steel pipe 20 are provided between the first PCCP pipe 16 and the second PCCP pipe 21. One end of the first steel pipe 17 is connected to the second pipe 20. A PCCP pipe 16 is socket-connected, one end of the second steel pipe 20 is socket-connected to the second PCCP pipe 21, the other end of the first steel pipe 17 and the other end of the second steel pipe 20 are respectively welded and connected to both ends of the steel short pipe 18, the first Either the steel pipe 17 or the second steel pipe 20 is provided with a second steel flange panel 22 to form a manhole. The manhole is located in the second inspection well 19. The first steel pipe 17 and the second steel pipe 20 are connected with the steel pipe. The short pipe 18 is provided with a steel collar 23 for reinforcement, and the outer walls of the first PCCP pipe 16, the first steel pipe 17, the steel collar 23, the second steel pipe 20 and the second PCCP pipe 21 are provided with reinforced concrete square packages 24; in order to To improve its firmness, the present invention adds piers 10 at the bottom of the first steel pipe 17 or the second steel pipe 20 with a manhole; the two ends of the reinforced concrete square package 24 in the embodiment of the present invention extend to the outside of the socket connection, extending The distance is 2000mm.

The present invention sets a second inspection well between the PCCP pipes to be connected at both ends to facilitate the welding connection operation. In the second inspection well part, the two PCCP pipes are socket-connected to the steel pipes respectively, and the two steel pipes are welded to the short steel pipes. In order to further seal the welded joint and the socket and improve their firmness, the present invention sets a steel collar at the connection point between the two steel pipes and the short steel pipe, and pours a reinforced concrete square package outside the PCCP pipe, steel pipe and steel collar to improve its stability. Stability, sealing and operability.

As shown in Figures 1, 6 and 7, the connection structure between the PCCP pipe and the square canal and three wastewater connecting pipes obtained by the construction of the present invention includes a second PCCP pipe 16, a transitional connecting steel pipe 36 and a square canal and three wastewater connecting pipes 27. One end of the transitional connecting steel pipe 36 It is inserted into the square canal three-sewage connecting pipe 27 and a sealing structure is provided between the transitional connecting steel pipe 36 and the square canal three-sewage connecting pipe 27. The bottom of the transitional connecting steel pipe 36 is provided with a concrete foundation 26 for fixation. The other end of the transitional connecting steel pipe 36 is connected to the second PCCP. pipe 16, the sealing structure includes a first cork formwork 30 and a second cork formwork 32 that are sleeved on the transitional connecting steel pipe 36 and tightly connected to the square canal three-sewage communication pipe 27. The first cork formwork 30 and the second cork formwork 32 An elastic epoxy grouting material 31 is filled in between. The gaps between the two ends of the transitional connecting steel pipe 36 and the square canal three-sewage connecting pipe 27 are respectively filled with a first epoxy concrete 29 and a second epoxy concrete 33. The first epoxy concrete There is a polymer mortar 28 on the outside of the second epoxy concrete 33 and a sealing paste 34 on the outside of the second epoxy concrete 33. In order to protect the transitional connection steel pipe 36, the present invention applies at least one layer of epoxy adhesive on the exposed surface of one end of the polymer mortar 28. Thick layers of paint.

The length of the transitional connecting steel pipe 36 of the present invention inserted into the square canal and three wastewater connecting pipes 27 is 1.8-2.2m, preferably 2m. The lengths of the first cork formwork 30 and the second cork formwork 32 are both 0.02m, and the elastic epoxy grouting material 31 fills the width is 1.16m, and the lengths of the first epoxy concrete 29, the second epoxy concrete 33, the polymer mortar 28 and the sealing paste 34 are all 0.2m.

In order to facilitate the construction of the elastic epoxy grouting material 31, the present invention reserves grouting pipes 35 at the four corners on the second cork formwork 32 and the second epoxy concrete 33, one end of the grouting pipe 35 extends into the cavity between the first cork formwork 30 and the second cork formwork 32, and the elastic epoxy grouting material is injected into the cavity between the first cork formwork 30 and the second cork formwork 32 through the grouting pipe 35. After the grouting is completed and the slurry is solidified, the grouting pipe 35 is removed, and the reserved holes of the grouting pipe 35 are sealed with resin mortar.

Claims (9)

1. A construction method for connecting old and new sewage pipes in the relocation and reconstruction of sewage pipes, including the construction of connecting the side PCCP pipes with the original three-sewage connecting pipes, the PCCP pipes with the square canal three-sewage connecting pipes, and the adjacent PCCP pipes containing inspection wells. For connection construction, segmented construction shall be carried out simultaneously or step by step: specifically: 1) According to the design drawings, excavate the pipeline foundation pit at the corresponding location and install the first PCCP pipe (16), the second PCCP pipe (21) and the third PCCP pipe (1), and the first PCCP pipe (16) is placed at an angle On the side of the original three-sewage connecting pipe (5), the first PCCP pipe (16) is placed on the side of the connection end of the square canal three-sewage connecting pipe (27), and the second PCCP pipe (21) is placed on the first PCCP pipe (16) and the second PCCP pipe (21). Position between three PCCP tubes (1); 2) Construction of connecting the side PCCP pipe with the original three-waste connecting pipe 201) First perform dewatering treatment on the original three-sewage connecting pipe (5), then construct the shaft of the first inspection well (4) and the square well (8) outside the third PCCP pipe (1), and then construct the square well (8) outside the third PCCP pipe (1). 8) Install water stops inside the location where the third PCCP pipe (1) and the original three-sewage connecting pipe (5) are connected, on the circumference of the third PCCP pipe (1), and around the original three-sewage connecting pipe (5). Steel plate (6), and at the same time, an angular embedded steel plate (2) is embedded at the connection between the square well (8) and the third PCCP pipe (1) and the abandoned section of the original three-pollution connecting pipe (5), and the square well (8) ) and the connecting section of the original three pollution connecting pipes (5) are pre-embedded with straight embedded steel plates (7); 202) According to the design requirements, remove the side plates of the original three-pollution connecting pipe (5) to form a connection port (14), and add a reinforcing steel plate (15) to the connection port (14); 203) pour C15 plain concrete in the abandoned section of the original three-waste connecting pipe (5) and pour it to the bottom of the top plate (801) of the square-wrapped well (8); 204) connecting the bottom of the third PCCP pipe (1) to the bottom of the connection port (14) of the original three-waste connecting pipe (5) through a bottom plate, pouring a C10 plain concrete layer (11) and a C30 reinforced concrete foundation layer (12), then pouring C15 plain concrete on top of the C30 reinforced concrete foundation layer (12) and pouring it to the bottom of the top plate (801) of the square-wrapped well (8), forming C15 plain concrete (3), and the gap between the third PCCP pipe (1), the original three-waste connecting pipe (5) and the square-wrapped well (8) forms a transition connection section (9); 3) Construction of adjacent PCCP pipe connections including inspection wells 301) First, construct the bottom plate and buttresses (25) of the second inspection well (19) at the connection between the first PCCP pipe (16) and the second PCCP pipe (21); 302) Make a hole in the second steel pipe (20), and set a second steel flange panel (22) to form a manhole, between the first PCCP pipe (16) and the second PCCP pipe (21) position, put the first steel pipe (17), the short steel pipe (18) and the second steel pipe (20) in order, and the manhole on the second steel pipe (20) is located in the center of the second inspection well (19), construction Personnel enters the pipe from the manhole, socket-connects the end of the first PCCP pipe (16) to the first steel pipe (17), and socket-connects the end of the second PCCP pipe (21) to one end of the second steel pipe (20). The other end of the first steel pipe (17) and the other end of the second steel pipe (20) are welded and connected to the two ends of the steel short pipe (18), and a steel collar (23) is attached to the steel short pipe (18) for reinforcement; 303) C25q reinforced concrete is constructed on the outer wall of the first PCCP pipe (16), the first steel pipe (17), the steel collar (23), the second steel pipe (20) and the second PCCP pipe (21) to form a reinforced concrete square package (24), and the connection is covered and fixed, and at the same time, a buttress (10) is cast on the second steel pipe (20); 4) Construction of connection between PCCP pipe and square canal three wastewater connecting pipes 401) For the places where the second PCCP pipe (21), the transitional connecting steel pipe (36) and the square canal and three wastewater connecting pipes (27) need to be cut over, drainage ditches should be set up around the foundation pit, and a water collection well should be set up at the lowest part of the foundation pit. Precipitation is carried out for 8-12 days in four weeks; 402) The foundation pit at the intersection of the new and old sewage connecting pipes shall be graded 1:0.8, leaving a construction surface of 1m on the side slope, and a water collection pit shall be built at the deepest part. The slope shall be protected by film covering method. After excavation, Lay nylon colored strips or thickened plastic film on the slope, and use woven earth bags or brick masonry edges at the top, platform and foot of the slope; 403) According to the design requirements, one end of the transitional connecting steel pipe (36) is socket-connected to the square canal three-sewage connecting pipe (27), and the other end is welded and connected to the second PCCP pipe (21), and a sealing structure is constructed at the socket connection. 2. A construction method for connecting new and old sewage pipes in sewage pipe relocation and reconstruction according to claim 1, characterized in that the second PCCP pipe (21), the transition connection steel pipe (36) and the square channel three-sewage connecting pipe (27) in step 4) are all provided with brick piers at the bottom for reinforcement. 3. A construction method for connecting new and old sewage pipes in sewage pipe shifting and reconstruction according to claim 1, characterized in that a 40*40cm drainage ditch is opened around the foundation pit in step 4), and at the lowest part of the foundation pit Set up a water collection well with a depth of 60cm, and pour high-grade reinforced concrete foundations and buttresses under the second PCCP pipe (21) and inspection well to ensure smooth takeover. 4. A construction method for connecting old and new sewage pipes in sewage pipe shifting and reconstruction according to claim 1, characterized in that the foundation pit dewatering in step 4) is carried out using a φ600 deep well, and the water pump is used to uniformly drain the water to the edge of the foundation pit. The drainage ditch merges into the municipal drainage system, and precipitation stops after the concrete structure construction is completed and the earthwork backfilling is completed. 5. A construction method for connecting new and old sewage pipes in the relocation and transformation of sewage pipes according to claim 1, characterized in that during the cutover process in step 4), a high-power blower is turned on to blow the connecting pipe, and the connecting pipe is blown using Continuous blowing reduces the density of toxic gases on the work surface. 6. A construction method for connecting new and old sewage pipes in sewage pipe shifting and reconstruction according to claim 1, characterized by the cutover of the second PCCP pipe (21) and the square canal three sewage connecting pipes (27) in step 4) The construction process is as follows: 1) Dig the square canal and the three-sewage connecting pipe (27) at the designed interface, cut and remove the excess square canal segments, and then pour the concrete steel pipe foundation; 2) Remove the sludge in the interface section of the square canal three-sewage connecting pipe (27), clean the four walls of the square canal three-sewage connecting pipe (27), and then insert one end of the transitional connecting steel pipe (36) into the square canal three-sewage connecting pipe (27); 3) Place the first cork formwork (30) and the second cork formwork (32) into the corresponding positions between the transitional connecting steel pipe (36) and the square canal three-sewage connecting pipe (27) and match them closely; 4) Fill the spaces outside the first cork formwork (30) and the second cork formwork (32) between the transitional connecting steel pipe (36) and the square canal three-sewage connecting pipe (27) with the first epoxy concrete (29). and the second epoxy concrete (33), and pre-buried grouting pipes (35) at the four corners of the space; 5) After the epoxy concrete reaches strength, pour the elastic epoxy grouting material into the space between the first cork formwork (30) and the second cork formwork (32) through the grouting pipe (35) under a pressure not exceeding 0.4MPa. (31); 6) After the elastic epoxy grouting material (31) in step 5) is cured, remove the grouting pipe (35), and use resin mortar to seal the reserved holes in the grouting pipe (35) flatly; 7) Inject polymer mortar (28) into the space outside the first epoxy concrete (29), and inject sealing paste (34) into the space outside the second epoxy concrete (33); wait until the polymer mortar (28) After reaching the design strength, paint the exposed surface of the transition connecting steel pipe (36) with epoxy thickening paint. 7. A construction method for connecting old and new sewage pipes in sewage pipe shifting and reconstruction according to claim 1, characterized in that the side PCCP pipe and the original three sewage connecting pipes are connected to each other to obtain a connection between the side PCCP pipe and the original three sewage connecting pipes. structure, the structure includes a third PCCP pipe (1) and the original three-sewage connecting pipe (5). The third PCCP pipe (1) is located on the side of the original three-sewage connecting pipe (5). The third PCCP pipe (1) and the original three-sewage connecting pipe (5) A square well (8) is provided at the connection of the three-sewage connecting pipe (5). The wall plate at the connection between the side of the original three-sewage connecting pipe (5) and the third PCCP pipe (1) is removed to form a connection port (14). There is a reinforced steel plate (15) at the bottom of the mouth (14). The gap between the square package well (8) and the outside of the third PCCP pipe (1), and the original three-pollution connecting pipe (5) are located in the abandoned section of the square package well (8). C15 cast concrete (3) is poured respectively, and the space formed between the two pieces of C15 cast concrete (3) is the transition connecting section (9). The transition connecting section (9) connects the third PCCP pipe (1) and the original three The connecting section of the sewage connecting pipe (5) is connected, so that the sewage is transferred from the original three sewage connecting pipe (5) to the third PCCP pipe (1), and the square package well (8) is connected with the original three sewage connecting pipe (5) and the third PCCP pipe (1). A water-stop steel plate (6) is provided at the connection of the PCCP pipe (1), and a first inspection well (4) is provided on the transitional connection section (9). 8. A construction method for connecting old and new sewage pipes in sewage pipe shifting and reconstruction according to claim 1, characterized in that the connection construction between PCCP pipes containing inspection wells results in a connection between PCCP pipes containing inspection wells. The structure includes a first PCCP pipe (16) and a second PCCP pipe (21). A second inspection well (19) is provided between the first PCCP pipe (16) and the second PCCP pipe (21). There are a first steel pipe (17), a steel short pipe (18) and a second steel pipe (20) between a PCCP pipe (16) and a second PCCP pipe (21). One end of the first steel pipe (17) is connected to the first The PCCP pipe (16) is socket-connected, one end of the second steel pipe (20) is socket-connected to the second PCCP pipe (21), and the other ends of the first steel pipe (17) and the second steel pipe (20) are respectively connected to the short steel pipes. The two ends of the pipe (18) are welded together, and a second steel flange panel (22) is provided on either the first steel pipe (17) or the second steel pipe (20) to form a manhole, which is located on the second steel pipe. In the inspection well (19), the first steel pipe (17), the second steel pipe (20) and the steel short pipe (18) are provided with steel collars (23) for reinforcement. The first PCCP pipe (16) and the A reinforced concrete square package (24) is provided on the outer wall of the first steel pipe (17), steel collar (23), second steel pipe (20) and second PCCP pipe (21). 9. A construction method for connecting old and new sewage pipes in the relocation and transformation of sewage pipes according to claim 1, characterized in that the connection construction of the PCCP pipe and the three sewage connecting pipes in the square canal results in a connection structure that connects the PCCP pipe and the three sewage connecting pipes in the square canal. , the structure includes a second PCCP pipe (21), a transitional connecting steel pipe (36) and a square channel three-sewage connecting pipe (27). One end of the transitional connecting steel pipe (36) is connected to the second PCCP pipe (21), and the transitional connecting steel pipe (36) The other end is inserted into the square canal three-sewage connecting pipe (27) and a sealing structure is provided between the transitional connecting steel pipe (36) and the square canal three-sewage connecting pipe (27).