Construction method for laying drainage pipe below road surface

Abstract

A construction method for laying a drainage pipe below a road surface comprises the following construction steps that S1, a starting foundation pit and a receiving foundation pit are excavated on the two sides of the road surface correspondingly, and a connecting line between the starting foundation pit and the receiving foundation pit is a laying path of the drainage pipe; s2, horizontal drilling is conducted from the side wall of the starting foundation pit or the side wall of the receiving foundation pit through a horizontal twist drill, or horizontal drilling is conducted from the side wall of the starting foundation pit and the side wall of the receiving foundation pit at the same time, and finally a communicated laying channel is formed between the starting foundation pit and the receiving foundation pit; s3, an embedded groove is formed in the side wall of the laying channel in the length direction of the laying channel in a full-length mode, and a mounting rail is laid in the embedded groove in a full-length mode; and S4, a sliding piece is fixed to the peripheral side of the drainage pipe, the sliding piece is installed in the installation rail in a sliding mode, the sliding piece is driven to move along the installation rail till the drainage pipe is dragged to one side of the receiving foundation pit from the starting foundation pit along the laying channel, and laying of the drainage pipe is completed. According to the construction method, laying of the drainage pipe below the road surface can be completed under the condition that road surface passing is not affected.

Description

Technical Field

[0001] The invention belongs to the technical field of underground pipeline laying, and in particular relates to a construction method for laying drainage pipes under a road surface. Background Art

[0002] In engineering practice, it is common to encounter the operation of laying drainage pipes under existing concrete pavements. Since the diameter of the drainage pipes is large, the method of first breaking the concrete pavement, then digging trenches, and finally laying the pipes is usually adopted.

[0003] This method causes damage to the concrete pavement structure. The durability and aesthetics of the subsequently rebuilt concrete pavement structure deteriorate. In addition, a large amount of noise is generated during the removal of the concrete pavement, and traffic is affected during construction, causing great trouble to the smooth passage of traffic. At the same time, there are also great restrictions on the construction period of the drainage pipe laying. Summary of the invention

[0004] The present invention provides a construction method for laying drainage pipes under a road surface, so as to solve the problem that laying drainage pipes under an existing concrete road surface affects traffic.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: A construction method for laying drainage pipes under a road surface comprises the following construction steps: S1: Excavate the starting foundation pit and the receiving foundation pit on both sides of the road surface. The line between the starting foundation pit and the receiving foundation pit is the laying path of the drainage pipe; S2: using a horizontal auger to drill horizontal holes from the side wall of the starting foundation pit or the side wall of the receiving foundation pit, or drilling horizontal holes from the side wall of the starting foundation pit and the side wall of the receiving foundation pit at the same time, and finally forming a connecting laying channel between the starting foundation pit and the receiving foundation pit; S3: A buried groove is provided on the side wall of the laying channel along the length direction of the laying channel, and the installation track is laid in the buried groove along the length direction; S4: Fix a sliding member around the drainage pipe, slide the sliding member in the installation track, drive the sliding member to move along the installation track until the drainage pipe is pulled from the starting foundation pit along the laying channel to one side of the receiving foundation pit, and complete the laying of the drainage pipe.

[0006] Furthermore, steel ring supports are arranged at intervals in the laying channel along the length direction of the laying channel, and the steel ring supports are anchored into the strata around the laying channel. Furthermore, in step S2, the side walls of the starting foundation pit and the receiving foundation pit are cast to form guide sections, and part of the guide sections are cast on the side walls of the starting foundation pit and the receiving foundation pit, and part of the guide sections are cast on the inner wall of the laying channel.

[0007] Furthermore, during the drilling process, if hole collapse occurs, spray support is performed locally on the side wall of the borehole.

[0008] Furthermore, the horizontal auger comprises a plurality of drill rod sections, two adjacent drill rod sections can be detachably spliced, and the spiral blades of the two adjacent drill rod sections are smoothly connected.

[0009] Furthermore, a traction cable capable of moving along the installation track is disposed throughout the installation track, and the traction cable is connected to the sliding member.

[0010] Furthermore, the horizontal drilling construction in step S2 and the construction of buried groove excavation and rail installation in step S3 are carried out simultaneously; and when excavating the inside of the laying channel in step S2, a slide rail is laid at the bottom of the laying channel, and a dump truck for loading and transporting debris is slidably installed on the slide rail.

[0011] Furthermore, after the construction of the laying channel is completed, the inner diameter of the smallest inner diameter of the entire section is S1, and the outer diameter of the drainage pipe is S2, wherein 3cm≤S1-S2≤5cm.

[0012] Furthermore, a grouting channel is provided throughout the entire length of the installation track, and a plurality of grouting branches are arranged at intervals along the length direction of the installation track, and two ends of the grouting branches are respectively connected to the inside of the laying channel and the grouting channel.

[0013] Furthermore, after the construction of step S4 is completed, concrete is poured in the gap between the guide section and the drainage pipe to close both ends of the laying channel, and the gap between the drainage pipe and the side wall of the laying channel is filled with grouting through the grouting channel.

[0014] The present invention can achieve the following beneficial effects: 1. The present application forms a laying channel by excavating a starting foundation pit and a receiving foundation pit on both sides of the road surface, and simultaneously excavating and connecting the starting foundation pit and the receiving foundation pit, so that there is no need to break the concrete road surface when excavating the drainage channel, and the normal operation of the upper road surface is not affected; when excavating the laying channel, an burying groove is opened and an installation track is laid, so that when the drainage pipe is passed through the laying channel to complete the installation, it can be more convenient and smooth.

[0015] 2. Casting at intervals to form steel ring supports and spraying supports at collapsed holes can provide support for the laying channel, reduce the impact of the excavation of the laying channel on the bearing capacity of the road surface above, and also help maintain the structural stability inside the laying channel and improve construction safety.

[0016] 3. Set up grouting channels and grouting sub-lanes. When the drainage pipe passes through the road surface in the later stage, the grouting channels and grouting sub-lanes can be used to fill the gap between the drainage pipe and the inner wall of the laying channel, thereby reducing the impact of the drainage pipe laying on the stability of the road foundation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Figure 1 From top to bottom, they are respectively a vertical cross-sectional schematic diagram and a top view of a construction method for laying drainage pipes under a road surface according to the present invention after the construction of step S1 is completed; Figure 2 From top to bottom are respectively a vertical section schematic diagram and a top view after the construction of step S2 of a construction method for laying drainage pipes under a road surface according to the present invention is completed; Figure 3 It is a schematic diagram of the local structure of the horizontal auger of the present invention; Figure 4 It is a vertical cross-sectional schematic diagram of a construction method for laying drainage pipes under a road surface after the construction of step S3 is completed; Figure 5 It is a schematic diagram of the partial structure of the installation track of the present invention; Figure 6 It is a schematic cross-sectional view of a laying channel used to illustrate the arrangement of a grouting channel and grouting channels of the present invention; Figure 7 It is a vertical cross-sectional schematic diagram of a construction method for laying drainage pipes under a road surface after the construction of step S4 is completed.

[0018] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1. Starting foundation pit; 2. Receiving foundation pit; 3. Laying channel; 4. Buried groove; 5. Installing track; 51. Grouting channel; 52. Grouting channel; 6. Drain pipe; 7. Sliding piece; 8. Steel ring support; 9. Guide section; 10. Horizontal auger; 11. Traction cable; 12. Slide rail; 13. Dump truck; 200. Road surface. DETAILED DESCRIPTION

[0019] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0020] like Figures 1 to 7As shown, the present application provides a construction method for laying municipal drainage pipes under the road surface. Usually, the diameter of the municipal drainage pipe 6 is between 1000mm-3000mm. According to municipal planning requirements, the width of each lane for motor vehicles is 3.75-4m. When the municipal drainage network is renovated or drainage pipes are added, if the drainage pipes need to cross the municipal roads, it is necessary to close the roads on both sides and excavate the roads for construction, which will cause traffic congestion and damage to the concrete road surface. The construction method of the present application can realize the laying of drainage pipes 6 with a diameter between 1800mm-3000mm under the concrete road surface for roads of different widths, and will not affect the normal traffic on the road surface during the laying construction process.

[0021] A construction method for laying drainage pipes under a road surface comprises the following construction steps: Step 1: excavate the starting foundation pit 1 and the receiving foundation pit 2 on both sides of the road surface 200, and the line between the starting foundation pit 1 and the receiving foundation pit 2 is the laying path of the drainage pipe 6. The starting foundation pit 1 and the receiving foundation pit 2 are at least 5 meters away from both sides of the road surface 200 to reduce the impact of the excavation of the starting foundation pit 1 and the receiving foundation pit 2 on the normal transportation of the road surface 200.

[0022] Step 2: Use a horizontal auger 10 to drill holes horizontally from the side walls of the starting foundation pit 1 and the receiving foundation pit 2 at the same time. If the road surface 200 is narrow, it is also possible to excavate from only one side until it passes through the road surface 200 and connects with the foundation pit on the other side. Excavating on both sides at the same time is more efficient, but in order to achieve accurate docking of the excavated channels on both sides, the construction accuracy of the excavation route is required to be higher. Finally, a connected laying channel 3 is formed between the starting foundation pit 1 and the receiving foundation pit 2.

[0023] After the excavation of the laying channel 3 is completed, the inner diameter of the smallest inner diameter of the entire section is S1, and the outer diameter of the drainage pipe 6 is S2, which must satisfy 3cm≤S1-S2≤5cm, so that the drainage pipe 6 can be smoothly laid in the laying channel 3, and the gap between the drainage pipe 6 and the inner wall of the laying channel 3 is small, reducing the difficulty of filling the gap between the drainage pipe 6 and the inner wall of the laying channel 3 in subsequent steps.

[0024] In the present application, the horizontal auger 10 includes a plurality of drill rod sections, and two adjacent drill rod sections can be detachably spliced. After the two adjacent drill rod sections are spliced, the spiral blades are smoothly connected. The horizontal auger 10 is used for drilling, so that the demand of drilling and removing the slag can be realized, and the steps of removing the slag can be reduced. The horizontal auger 10 is set to have multiple drill rod sections, and after a drill rod section is drilled into the head layer, the next drill rod section is installed and spliced, and the drilling is continued, so that the construction operation surface required by the horizontal auger 10 is smaller, so as to reduce the excavation area of ​​the starting foundation pit 1 and the receiving foundation pit 2.

[0025] For a wide road surface 200, when a single horizontal auger 10 is difficult to drill a hole half the width of the road surface 200, the drilling of the hole can be achieved in multiple times. After the first drilling of the horizontal auger 10 is completed, the side wall of the hole is supported. After the support is completed, the construction personnel enter the hole and set up the drilling rig from the excavation surface to drill the second horizontal auger 10 hole; if the drilling rig is difficult to enter the hole to drill the horizontal auger 10 during the second drilling construction, the second drilling construction can be achieved by manual excavation.

[0026] During the initial drilling excavation, after the horizontal drilling point is determined, firstly, the side walls of the starting foundation pit 1 and the receiving foundation pit 2 are respectively cast with concrete to form a guide section 9, wherein the guide section 9 is partially cast on the side walls of the starting foundation pit 1 and the receiving foundation pit 2, and partially cast on the inner wall of the laying channel 3. By casting the guide section 9, on the one hand, the soil layer in the starting area of ​​the horizontal drilling can be maintained stable, and the phenomenon of hole collapse can be reduced; on the other hand, the path of the horizontal drilling can be guided, and the occurrence of deviation during the drilling process can be reduced.

[0027] A support structure is formed inside the laying channel 3, and the construction of the support structure is carried out simultaneously with the drilling of the laying channel 3. Specifically, after the first horizontal spiral drill 10 completes the drilling, the side wall of the borehole can be supported. If the second channel excavation is carried out by manual excavation, the inner wall of the channel can be supported while excavation is being carried out.

[0028] On the one hand, the construction of the support structure includes setting steel ring supports 8 at intervals in the laying channel 3. The setting interval of the steel ring supports 8 can be specifically determined according to the bearing capacity of the soil layer, and the steel ring supports 8 are anchored to the stratum around the borehole by anchor rods or anchor nails; the steel ring supports 8 are used to achieve support to reduce the impact of the movement of vehicles above on the stability of the laying channel 3 below. On the other hand, the construction of the support structure also includes local shotcrete support in the collapsed hole area or the local area where the soil layer is loose and the debris falls, so as to maintain the stability of the inner wall of the laying channel 3.

[0029] Step 3: A buried groove 4 is opened along the length of the laying channel 3 on the side wall of the laying channel 3, two buried grooves 4 are opened symmetrically, and the installation track 5 is laid in the buried groove 4. If a horizontal spiral drill 10 is used for drilling, the buried groove 4 is opened after the drilling and support structure construction are completed; if there is a manual excavation section, the buried groove 4 can be opened while excavating. The excavation of the buried groove 4 and the laying of the installation track 5 can also be carried out simultaneously. After the installation track 5 is placed in the buried groove 4 in sections, the installation track 5 is anchored and fixed to the surrounding soil layer using anchor nails.

[0030] After the first horizontal drilling construction is completed, the buried groove 4 and the installation track 5 are installed, and the slide rail 12 can also be laid at the bottom of the channel formed by the first horizontal drilling excavation; before the second horizontal drilling, a dump truck 13 for loading slag is slidably set on the slide rail 12, and the dump truck 13 is used to transport the slag generated by the second horizontal drilling. The slide rail 12 and the dump truck 13 can be used to transport the slag more efficiently and labor-savingly.

[0031] Step 4: Lay the drain pipe 6, fix the sliding member 7 on the circumference of the end of the drain pipe 6, and slide the sliding member 7 in the installation track 5. Specifically, when the installation track 5 is laid in the previous step, a traction cable 11 is provided throughout the installation track 5. When laying the drain pipe 6, the traction cable 11 can be used to assist in driving the sliding member 7 and the drain pipe 6 to move along the installation track 5 to reduce obstruction during the laying of the drain pipe 6, until the drain pipe 6 is pulled from the starting foundation pit 1 along the laying channel 3 to the side of the receiving foundation pit 2, and the laying of the drain pipe 6 is completed. It should be noted that the slide rail 12 and the dump truck 13 have been removed when the drain pipe 6 is laid.

[0032] Furthermore, a grouting channel 51 is provided throughout the installation track 5, and a plurality of grouting branches 52 are provided at intervals along the length direction on the installation track 5, and the two ends of each grouting branch 52 are respectively connected to the inside of the laying channel 3 and the grouting channel 51. After the drainage pipe 6 is laid, concrete is poured in the gap between the guide section 9 and the drainage pipe 6, and the two ends of the laying channel 3 are closed. Then, the grouting channel 51 and the grouting branches 52 are used to grout the gap between the drainage pipe 6 and the side wall of the laying channel 3. The gap between the drainage pipe 6 and the side wall of the laying channel 3 can be filled with mud mixed with cement slurry, and the slurry strength is lower than the concrete filling strength between the guide section 9 and the drainage pipe 6.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for laying drainage pipes under a road surface, characterized in that: The construction steps include: S1: excavating a starting foundation pit (1) and a receiving foundation pit (2) on both sides of the road surface (200), respectively, wherein the line connecting the starting foundation pit (1) and the receiving foundation pit (2) is the laying path of the drainage pipe (6); S2: using a horizontal auger (10) to drill horizontal holes from the side wall of the starting foundation pit (1) or the side wall of the receiving foundation pit (2), or drilling horizontal holes from the side wall of the starting foundation pit (1) and the side wall of the receiving foundation pit (2) at the same time, and finally forming a connecting laying channel (3) between the starting foundation pit (1) and the receiving foundation pit (2); S3: a buried groove (4) is provided on the side wall of the laying channel (3) along the length direction of the laying channel (3), and a mounting track (5) is laid in the buried groove (4) along the length direction; S4: A sliding member (7) is fixed around the drainage pipe (6), the sliding member (7) is slidably installed in the installation track (5), and the sliding member (7) is driven to move along the installation track (5) until the drainage pipe (6) is pulled from the starting foundation pit (1) along the laying channel (3) to the side of the receiving foundation pit (2), thereby completing the laying of the drainage pipe (6).

2. A method for laying drainage pipes under a road surface according to claim 1, characterized in that: Steel ring supports (8) are arranged at intervals in the laying channel (3) along the length direction of the laying channel (3), and the steel ring supports (8) are anchored into the ground formation around the laying channel (3).

3. The method for laying drainage pipes under a road surface according to claim 1, characterized in that: In step S2, the side walls of the starting foundation pit (1) and the receiving foundation pit (2) are cast to form a guide section (9), wherein part of the guide section (9) is cast on the side walls of the starting foundation pit (1) and the receiving foundation pit (2), and part of the guide section (9) is cast on the inner wall of the laying channel (3).

4. A method for laying drainage pipes under a road surface according to claim 1, characterized in that: During the drilling process, if hole collapse occurs, shotcrete support will be carried out locally on the side wall of the hole.

5. The method for laying drainage pipes under a road surface according to claim 1, characterized in that: The horizontal auger (10) comprises a plurality of drill rod sections, two adjacent drill rod sections can be detachably spliced, and the spiral blades of the two adjacent drill rod sections are smoothly connected.

6. A method for laying drainage pipes under a road surface according to claim 1, characterized in that: A traction cable (11) capable of moving along the installation track (5) is arranged throughout the installation track (5), and the traction cable (11) is connected to the sliding member (7).

7. A method for laying drainage pipes under a road surface according to claim 1, characterized in that: The horizontal drilling construction in step S2 and the excavation of the buried groove (4) and the installation of the track (5) in step S3 are carried out simultaneously; and when the interior of the laying channel (3) is excavated in step S2, a slide rail (12) is laid at the bottom of the laying channel (3), and a slag bucket truck (13) for loading and transporting slag is slidably installed on the slide rail (12).

8. The method for laying drainage pipes under a road surface according to claim 1, characterized in that: After the construction of the laying channel (3) is completed, the inner diameter of the smallest inner diameter of the entire section is S1, and the outer diameter of the drainage pipe (6) is S2, wherein 3cm≤S1-S2≤5cm.

9. A method for laying drainage pipes under a road surface according to claim 1, characterized in that: A grouting channel (51) is provided throughout the installation track (5), and a plurality of grouting branches (52) are provided at intervals along the length direction of the installation track (5), and the two ends of the grouting branches (52) are respectively connected to the inside of the laying channel (3) and the grouting channel (51).

10. A method for laying drainage pipes under a road surface according to claim 9, characterized in that: After step S4 is completed, concrete is poured into the gap between the guide section (9) and the drainage pipe (6), the two ends of the laying channel (3) are closed, and the gap between the drainage pipe (6) and the side wall of the laying channel (3) is filled with grout using the grouting channel (51).

Images