Construction method of water-rich layer filling pile on high-speed railway shoulder through pipeline laying

Abstract

The application relates to the technical field of railway operating line expansion, in particular to a construction method for laying water-rich layer pouring piles by penetrating pipelines on the shoulder of a high-speed railway. In the construction method, a protective plate is first constructed on the side close to the shoulder at the position of the pouring pile to be constructed, a grouting anchor rod is punched, and the end of the grouting anchor rod is locked on the top of the protective plate, so that the grouting anchor rod and the protective plate form an angular reinforced support structure, the stability of the roadbed structure can be improved, the disturbance influence of subsequent pouring pile construction on the roadbed can be avoided, and the safe use of the existing railway operating line is ensured. The combined construction mode of manual hole digging and a small spiral drilling machine is adopted, the manual hole digging accurately penetrates the laying layer with dense pipelines, when unknown pipelines are found in the manual hole digging process, timely relocation is carried out, so that the blind construction of large drilling tools in the dense pipeline area is avoided, the small spiral drilling machine is matched to meet the height and limit requirements of the high-speed railway operating line construction, and the limit invasion risk is eliminated from the construction equipment and process.

Description

Technical Field

[0001] This application relates to the field of railway line expansion technology, and in particular to a construction method for laying water-rich layer cast-in-place piles through pipelines on the shoulder of a high-speed railway. Background Technology

[0002] In the renovation of existing high-speed railway lines, it is often necessary to extend the existing line frame bridge, widen the existing roadbed, build bridge piers on the existing roadbed, or modify the structure when renovating existing stations. Often, pile foundations need to be constructed on the high-speed railway shoulder as a protective facility for deep foundation pit excavation to ensure the stability of existing line facilities and traffic safety. At the same time, pile foundations for station buildings such as buildings and canopies also need to be set on the road shoulder when renovating stations.

[0003] Due to the combined effects of various railway line renovations and urban planning, the shoulder area of ​​the high-speed railway not only has railway-owned pipelines laid along the parallel line, but also a large number of municipal pipelines that intersect and pass under the railway subgrade. These pipelines are diverse in type and densely distributed, and some areas contain shallow aquifers, posing significant obstacles to the construction of cast-in-place piles. Conventional pile foundation construction methods, due to issues such as excessive drilling tool height, insufficient protection during pipeline exploration, and inappropriate dewatering measures for aquifers, are prone to violating the safety limits for construction on operating high-speed railway lines, causing pipeline damage, subgrade settlement and deformation, and even affecting the normal operation of the high-speed railway, thus failing to meet the construction and renovation requirements of adjacent existing lines.

[0004] Therefore, there is a need to provide an improved technical solution that addresses the shortcomings of the existing technology. Summary of the Invention

[0005] The purpose of this application is to provide a construction method for laying water-rich grouting piles through pipelines on the shoulder of high-speed railways, so as to solve or alleviate the problems existing in the above-mentioned prior art.

[0006] To achieve the above objectives, this application provides the following technical solution: A construction method for laying cast-in-place piles penetrating water-rich layers on the shoulder of a high-speed railway, the method comprising the following steps: Step 1, pre-construction preparation, specifically includes: setting up roadbed settlement and deformation monitoring points, adjusting protective facilities, and construction operation platform; Step 2: Excavate and relocate pipelines that affect the construction of cast-in-place piles; Step 3: First, construct a protective slab on the side of the road shoulder near the location of the pile to be constructed; Step 4: Install grouting anchors in the roadbed and lock the ends of the grouting anchors to the protective plate; Step 5: Manually dig a hole on the side of the protective plate away from the road shoulder, and stop manually digging the hole after penetrating the pipeline laying layer; Step 6: Continue drilling using a small auger drill on top of the manual excavation until the designed pile bottom elevation is reached; Step 7: Use a small auger drill to hoist and weld the reinforcing cage, and pour concrete into the hole after cleaning it. Step 8: Set up displacement observation points at the top of the cast-in-place pile.

[0007] In the above-described construction method for laying water-rich layer cast-in-place piles through pipelines on the shoulder of a high-speed railway, preferably, in step 1, the roadbed settlement and deformation monitoring points are equipped with prism lenses, and multiple prism lenses are respectively arranged on the sleepers, contact wire poles and shoulders of the railway operating line.

[0008] In the above-described construction method for laying water-rich layer cast-in-place piles through pipelines on the shoulder of a high-speed railway, preferably, in step 3, before pressing in the protective plate, a hand drill is used to probe the construction location of the protective plate. If an unknown pipeline is encountered, it is promptly relocated; the protective plate is then pressed into the roadbed.

[0009] In the above-described construction method for laying water-rich layer cast-in-place piles through pipelines on the shoulder of a high-speed railway, preferably, the cross-sectional shape of the protective plate is semi-enclosed, and the semi-enclosed opening of the protective plate faces the location of the cast-in-place pile to be constructed.

[0010] In the above-described construction method for laying water-rich layer cast-in-place piles through pipelines on the shoulder of a high-speed railway, preferably, the top of the protective plate is provided with a clearance hole.

[0011] In the above-described construction method for laying water-rich layer cast-in-place piles through pipelines on the shoulder of a high-speed railway, preferably, in step 4, an inclined borehole is drilled into the roadbed from the clearance hole of the protective plate, and a grouting anchor is installed in the borehole. Grout is injected into the borehole through the grouting anchor, and the end of the grouting anchor penetrates the clearance hole of the protective plate and is locked on the protective plate.

[0012] In the above-described construction method for laying water-rich layer cast-in-place piles through pipelines on the shoulder of a high-speed railway, preferably, in step 5, a reinforced concrete interlock is set in the manually excavated part, the inner diameter of the reinforced concrete interlock is larger than the diameter of the drilled hole in step 6, and the reinforced concrete interlock is higher than the ground.

[0013] In the above-described construction method for laying cast-in-place piles in a water-rich layer through pipelines on the shoulder of a high-speed railway, preferably, in step 5, when manually excavating a hole into the water-rich layer, a manhole is used for dewatering; at the same time, boreholes are drilled around the perimeter of the hole formed by manual excavation, and grout is injected into the boreholes to stop water flow.

[0014] As described above, in the construction method of laying cast-in-place piles through pipelines on the shoulder of a high-speed railway, preferably, the well dewatering involves first constructing a dewatering hole to the water-rich layer using a hand drill outside a manually excavated hole, then installing a pumping pipe in the dewatering hole, and finally setting up a pumping pump at the top of the pumping pipe.

[0015] In the above-described construction method for laying water-rich layer cast-in-place piles through pipelines on the shoulder of a high-speed railway, preferably, a prism lens is installed at the displacement observation point. By monitoring the position of the prism lens at the displacement observation point, the horizontal and vertical displacement of the top of the cast-in-place pile can be monitored. An alarm is triggered when the cumulative displacement of the top of the cast-in-place pile exceeds the set value.

[0016] Compared with the closest prior art, the technical solution of this application has the following beneficial effects: In this construction method, a protective plate is first constructed on the side of the road shoulder near the location of the cast-in-place pile to be constructed, and grouting anchors are installed. The ends of the grouting anchors are locked to the top of the protective plate. The grouting anchors and the protective plate together form an angular reinforced support structure, which can improve the stability of the roadbed structure and avoid the disturbance of the roadbed caused by the subsequent construction of cast-in-place piles, thereby ensuring the safe use of the existing railway operating line.

[0017] Meanwhile, a combination of manual excavation and small auger drilling rigs was adopted. Manual excavation allowed for precise penetration of densely laid pipeline layers. If any unknown pipelines were discovered during the manual excavation process, they were promptly relocated to avoid blind construction by large drilling tools in areas with dense pipelines. The small auger drilling rigs were used to meet the height and clearance requirements for construction on high-speed railway operating lines, thus eliminating the risk of encroachment on clearances through construction equipment and processes.

[0018] After manually excavating to the water-rich layer, if groundwater, seepage, water inrush, quicksand, or other issues occur, passive dewatering is carried out through wells, and active grouting is performed to stop the water flow around the borehole wall. At the same time, by combining passive dewatering through wells with active grouting to stop the water flow, the soil around the borehole is reinforced, and the water level around the borehole is lowered to ensure safe construction of the borehole.

[0019] In addition, roadbed settlement and deformation monitoring points are set up before construction, and pile displacement observation points are set up after construction. The monitoring points and displacement observation points are monitored by the supporting total station automated monitoring system, so as to grasp the deformation of the roadbed and piles in real time and ensure the safety of the high-speed railway roadbed and operation. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. Wherein: Fig. 1This is a schematic diagram of the cross-section of a cast-in-place pile according to some embodiments of this application; Fig. 2 This is a schematic diagram of the horizontal cross-section of a cast-in-place pile construction according to some embodiments of this application.

[0021] Explanation of reference numerals in the attached figures: 1. Pumping pipe; 2. Pumping pump; 3. Small auger drill; 4. Contact wire pole; 5. Roadbed settlement and deformation monitoring point; 6. Grouting anchor; 7. Protective plate; 8. Reinforced concrete interlocking. Detailed Implementation

[0022] The present application will now be described in detail with reference to the accompanying drawings and embodiments. Various examples are provided by way of interpretation and not by way of limitation. In fact, those skilled in the art will recognize that modifications and variations can be made to the present application without departing from the scope or spirit thereof. For example, a feature represented or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desirable that the present application encompass such modifications and variations that fall within the scope of the appended claims and their equivalents.

[0023] In the following description, the terms "first / second / third" are used merely to distinguish similar objects and do not represent a specific order of objects. It is understood that "first / second / third" may be interchanged in a specific order or sequence where permitted, so that the embodiments of this application described herein can be implemented in an order other than that illustrated or described herein.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing embodiments of this disclosure only and is not intended to limit this disclosure.

[0025] In the description of this application, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and do not require that this application be constructed and operated in a specific orientation, and therefore should not be construed as limiting this application. The terms "connected," "linked," and "set up" used in this application should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; direct connections or indirect connections through intermediate components; wired connections, radio connections, or wireless communication signal connections. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0026] The present application will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present application can be combined with each other.

[0027] According to specific embodiments of this application, such as Figs. 1-2 As shown, this application provides a construction method for laying cast-in-place piles in water-rich layers through pipelines on the shoulder of a high-speed railway. The construction method includes the following steps: Step 1, pre-construction preparation, specifically includes: setting up 5 roadbed settlement and deformation monitoring points, adjusting protective facilities, and construction operation platform.

[0028] Step 2: Excavate and relocate pipelines that may affect the construction of cast-in-place piles.

[0029] Step 3: First, construct the protective plate 7 on the side of the road shoulder near the location of the pile to be constructed.

[0030] Step 4: Install grouting anchors 6 into the roadbed and lock the ends of the grouting anchors 6 onto the protective plate 7.

[0031] Step 5: Manually excavate a hole on the side of the protective plate 7 away from the road shoulder, and stop manually excavating after penetrating the pipeline laying layer; the manually excavated hole is formed to 1m below the pipeline laying layer.

[0032] Step 6: Continue drilling using a small auger drill 3 on the basis of manual excavation until the designed pile bottom elevation is reached; In this embodiment, the total height of the small auger drill 3 is ≤3.8m, the safe distance from the center of the high-speed railway line during installation is ≥3.1m, and the safe distance from the contact wire return line on the shoulder of the high-speed railway is >2m. An insulating plate is installed on the top of the small auger drill 3.

[0033] Step 7: Use a small auger drill 3 to hoist and weld the reinforcing cage, and then pour concrete into the hole after cleaning. In this embodiment, a guide pipe is used for hole cleaning, and concrete is poured after the reinforcing cage is welded in sections. Segmentation involves processing the long reinforcing cage into sections while meeting the hoisting safety limits, and using a small auger drill 3 for hoisting and welding. The length of a single section of the reinforcing cage is ≤4m.

[0034] Step 8: Set up displacement observation points at the top of the cast-in-place pile.

[0035] In this construction method, a protective plate 7 is first constructed on the side of the road shoulder near the location of the cast-in-place pile to be constructed, and grouting anchor rods 6 are installed. The ends of the grouting anchor rods 6 are locked to the top of the protective plate 7. The grouting anchor rods 6 and the protective plate 7 together form an angular reinforced support structure, which can improve the stability of the roadbed structure and avoid the disturbance of the roadbed caused by the subsequent construction of cast-in-place piles, thereby ensuring the safe use of the existing railway operating line.

[0036] Meanwhile, a combination of manual excavation and small spiral drilling rig 3 is adopted. Manual excavation can accurately penetrate the dense pipeline layer. If an unknown pipeline is found during the manual excavation process, it can be relocated in time to avoid blind construction of large drilling tools in dense pipeline areas. The small spiral drilling rig 3 is used to meet the height and clearance requirements of high-speed railway operating line construction, and eliminate the risk of encroachment on the clearance from the perspective of construction equipment and process.

[0037] In addition, 5 roadbed settlement and deformation monitoring points were set up before construction, and pile displacement observation points were set up after construction. The monitoring points and displacement observation points were monitored by the supporting total station automated monitoring system, so as to grasp the deformation of the roadbed and piles in real time and ensure the safety of the high-speed railway roadbed and operation.

[0038] In step 1, the roadbed settlement and deformation monitoring point 5 is equipped with a prism lens, and multiple prism lenses are respectively arranged on the sleepers, contact wire poles 4 and shoulders of the railway operating line.

[0039] In this embodiment, a total station automated monitoring system is used to monitor the prism lens at a set time frequency. During construction, monitoring data can be automatically collected and uploaded every 2 hours. An alarm is triggered when the cumulative horizontal or vertical displacement of a prism lens reaches a warning value. The alarm threshold is set to a cumulative horizontal displacement ≥7mm or a vertical displacement ≥5mm. In other embodiments, the prism lens can also be monitored periodically by manually operating the total station.

[0040] Among them, the prism can be placed on the top surface of the sleeper end, the four sides of the contact wire pole, and the concrete foundation of the road shoulder. The density of the monitoring points can be in the range of 5~10m / point.

[0041] The protective facilities of high-speed railways were originally buried 0.5m inside the railway boundary and at a height of ≥1.8m. After relocation, the distance between them and the center of the line is ≥3.1m. The protective facilities are concrete fences, metal mesh fences, or brick walls. A 1.2m high isolation net is added inside the relocated protective facilities, and the distance between the 1.2m high isolation net and the center of the line is ≥1.75m.

[0042] The working platform after construction is the same height as the road shoulder. The working platform is constructed by excavating the original ground soil that is higher than the road shoulder, or by filling the original ground that is lower than the road shoulder, so that the working platform can meet the construction requirements of the cast-in-place piles.

[0043] In step 2, the pipelines include railway communication, signaling, power, and through-ground wire pipelines parallel to the railway operating lines, as well as municipal gas pipelines, heating pipelines, rainwater and sewage pipelines, communication and signaling optical cables, high-voltage power cables, and various pipeline protective culverts that cross the railway operating lines. All pipelines that affect construction need to be relocated and protected in advance. The pipeline ledgers of municipal and railway equipment management units can be retrieved. The ledgers contain key information such as pipeline type, structure, size, and burial depth. Based on the ledgers, on-site supervision and excavation can be carried out on pipelines that cross or pass under the lines and affect the construction of cast-in-place piles (including municipal gas, heating, rainwater and sewage pipelines, communication and signaling optical cables, high-voltage power cables, and protective culverts, etc.). Shallow buried pipelines are directly excavated and protected, while deep pipelines are relocated to ensure that there are no safety hazards in the pipelines in the construction area.

[0044] In step 3, before pressing in the protective plate 7, a hand drill is used to probe the construction location of the protective plate 7. If an unknown pipeline is encountered, it is promptly relocated. The protective plate 7 is then pressed into the roadbed. In this embodiment, the protective plate 7 can be pressed into the roadbed using a vibratory hammer or a static pressure pile driver. The pressing depth of the protective plate 7 is set to be less than the burial depth of the pipeline laying layer to further avoid damage to undiscovered unknown pipelines during the construction of the protective plate 7. At the same time, the protective plate 7 pressed into the roadbed, in conjunction with the anchor bolt support structure, can play a certain role in reinforcing and supporting the roadbed.

[0045] The protective plate 7 has a semi-enclosed cross-sectional shape, with the semi-enclosed opening facing the location of the pile to be constructed. In this embodiment, the cross-section of the protective plate 7 can be arc-shaped, V-shaped, U-shaped, C-shaped, or trapezoidal without a bottom edge, to ensure good structural strength. After the protective plate 7 is pressed into the roadbed, its semi-enclosed position near the shoulder of the pile to be constructed provides good protection for the pile area. This prevents the pile from collapsing due to the pressure from the railway line during excavation, thus ensuring the safety of the pile construction.

[0046] The top of the protective plate 7 is provided with clearance holes.

[0047] In step 4, an inclined borehole is drilled into the roadbed from the clearance hole of the protective plate 7, and a grouting anchor rod 6 is installed in the borehole. Grout is injected into the borehole through the grouting anchor rod 6. The end of the grouting anchor rod 6 passes through the clearance hole of the protective plate 7 and is locked on the protective plate 7.

[0048] In this embodiment, neither the drilling nor the grouting anchor 6 extends directly below the rail, so as to avoid the drilling and grouting anchor 6 construction affecting the use of the rail, and to ensure the safe use of the railway line to the greatest extent.

[0049] Among them, the grouting anchor 6, by injecting grout into the borehole, not only strengthens the bottom structure of the subgrade, but also anchors the grouting anchor 6 more firmly in the borehole. At the same time, the grouting anchor 6 provides reinforced support for the top of the protective plate 7. The grouting anchor 6 is equivalent to a support rod structure driven into the subgrade at an angle, so that the grouting anchor 6 and the protective plate 7 form an angular reinforced support structure, which greatly improves the stability of the subgrade structure and ensures that the construction of subsequent cast-in-place piles and the normal operation of the railway line are as uninterrupted as possible.

[0050] In step 5, a reinforced concrete lock 8 is set in the manually excavated part. The inner diameter of the reinforced concrete lock 8 is larger than the diameter of the hole drilled in step 6, and the reinforced concrete lock 8 is higher than the ground.

[0051] In this embodiment, the diameter of the reinforced concrete interlock 8 is 20cm larger than the pile diameter and 30cm higher than the ground. A 15cm thick reinforced concrete inverted wedge-shaped ring is used as a protective wall. The excavation is carried out while the protection is being carried out. The daily excavation depth is ≤1m, and the total depth of manual excavation is ≤10m. 2-3 manually excavated piles can be constructed continuously, and then drilling rigs can be used to continue the construction. The manually excavated piles that have been completed can be used as temporary mud pits for drilling rig drilling and pile grouting.

[0052] In step 5, when the manually excavated hole enters the water-rich layer, a well is used for dewatering; at the same time, boreholes are drilled around the perimeter of the hole formed by the manually excavated hole, and grout is injected into the boreholes to stop the water.

[0053] In this embodiment, after manual excavation reaches the water-rich layer, if groundwater, seepage, water inrush, or quicksand occurs, passive dewatering is carried out through wells, and active grouting is performed to stop the water flow around the manually excavated borehole. Simultaneously, the combination of passive dewatering through wells and active grouting reinforces the soil around the manually excavated borehole and lowers the water level, ensuring safe construction. The drilling depth for grouting is controlled within the range of 3-9m, and a two-liquid grouting method is used.

[0054] The well dewatering process involves first constructing a dewatering hole to the water-rich layer using a hand drill outside a manually excavated hole, then installing a pumping pipe 1 in the dewatering hole, and finally setting up a pumping pump 2 at the top of the pumping pipe 1.

[0055] In this embodiment, the water pump 2 extracts water near the construction location of the cast-in-place pile through the water pumping pipe 1 to achieve precise dewatering in a small area, which meets the requirements for waterless operation of manual excavation construction and avoids the risk of existing line settlement caused by rapid extraction of groundwater. Construction is carried out after the water level at the construction location of the cast-in-place pile is reduced to the safety requirements.

[0056] The handheld drill's drill rod tip is designed with an upsetting structure, allowing for a clear feel when the drill rod end encounters a pipeline, enabling timely stopping of drilling. The upsetting structure at the drill rod tip also minimizes damage to the pipeline. Furthermore, the handheld drill can be used to probe for pipelines within the remaining length of manually excavated piles when the pile depth is less than 10m. The pumping pipe 1 is a 5cm diameter PVC pipe, and multiple perforations are provided on the pipe wall of the pumping pipe 1 located in the aquifer.

[0057] A prism lens is installed at the displacement observation point. By monitoring the prism lens at the displacement observation point, the horizontal and vertical displacement of the top of the cast-in-place pile can be monitored. An alarm is triggered when the cumulative displacement of the top of the cast-in-place pile exceeds a set value. In this embodiment, an automated monitoring system using a total station monitors the prism lens at a set time frequency of 10 times / 3 days. An alarm is triggered when the cumulative horizontal or vertical displacement exceeds ±10mm. The monitoring data serves as the basis for determining construction safety. In other embodiments, the prism lens can also be monitored periodically by manually operating a total station and a level.

[0058] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A construction method for laying cast-in-place piles in water-rich layers through pipelines on the shoulder of a high-speed railway, characterized in that... The construction method includes the following steps: Step 1, pre-construction preparation, specifically includes: setting up roadbed settlement and deformation monitoring points, adjusting protective facilities, and construction operation platform; Step 2: Excavate and relocate pipelines that affect the construction of cast-in-place piles; Step 3: First, construct a protective slab on the side of the road shoulder near the location of the pile to be constructed; Step 4: Install grouting anchors in the roadbed and lock the ends of the grouting anchors to the protective plate; Step 5: Manually dig a hole on the side of the protective plate away from the road shoulder, and stop manually digging the hole after penetrating the pipeline laying layer; Step 6: Continue drilling using a small auger drill on top of the manual excavation until the designed pile bottom elevation is reached; Step 7: Use a small auger drill to hoist and weld the reinforcing cage, and pour concrete into the hole after cleaning it. Step 8: Set up displacement observation points at the top of the cast-in-place pile.

2. The construction method for laying water-rich layer cast-in-place piles through pipelines on the shoulder of a high-speed railway according to claim 1, characterized in that, In step 1, prism lenses are installed at the roadbed settlement and deformation monitoring points. Multiple prism lenses are respectively arranged on the sleepers, contact wire poles and shoulders of the railway operating line.

3. The construction method for laying water-rich layer cast-in-place piles through pipelines on the shoulder of a high-speed railway according to claim 1, characterized in that, In step 3, before pressing the protective plate into the roadbed, a hand drill is used to probe the construction location of the protective plate. If an unknown pipeline is encountered, it is promptly relocated. The protective plate is then pressed into the roadbed.

4. The construction method for laying water-rich layer cast-in-place piles through pipelines on the shoulder of a high-speed railway according to claim 3, characterized in that, The protective plate has a semi-enclosed cross-sectional shape, with the semi-enclosed opening facing the location of the pile to be constructed.

5. The construction method for laying water-rich layer cast-in-place piles through pipelines on the shoulder of a high-speed railway according to claim 4, characterized in that, The top of the protective plate is provided with clearance holes.

6. The construction method for laying water-rich layer cast-in-place piles through pipelines on the shoulder of a high-speed railway according to claim 5, characterized in that, In step 4, an inclined borehole is drilled into the roadbed from the clearance hole of the protective plate, and a grouting anchor is installed in the borehole. Grout is injected into the borehole through the grouting anchor. The end of the grouting anchor penetrates the clearance hole of the protective plate and is locked to the protective plate.

7. The construction method for laying water-rich layer cast-in-place piles through pipelines on the shoulder of a high-speed railway according to claim 5, characterized in that, In step 5, a reinforced concrete lock is set in the manually excavated part. The inner diameter of the reinforced concrete lock is larger than the diameter of the hole drilled in step 6, and the reinforced concrete lock is higher than the ground.

8. The construction method for laying water-rich layer cast-in-place piles through pipelines on the shoulder of a high-speed railway according to claim 7, characterized in that, In step 5, when the manually excavated hole enters the water-rich layer, a well is used for dewatering; at the same time, boreholes are drilled around the perimeter of the hole formed by the manually excavated hole, and grout is injected into the boreholes to stop the water.

9. The construction method for laying water-rich layer cast-in-place piles through pipelines on the shoulder of a high-speed railway according to claim 7, characterized in that, Well dewatering involves first drilling a dewatering hole to the water-rich layer using a hand drill outside a manually excavated borehole, then installing a pumping pipe in the dewatering hole, and finally setting up a pumping pump at the top of the pumping pipe.

10. The construction method for laying water-rich layer cast-in-place piles through pipelines on the shoulder of a high-speed railway according to claim 1, characterized in that, The displacement observation point is equipped with a prism lens. By monitoring the position of the prism lens at the displacement observation point, the horizontal and vertical displacement of the top of the cast-in-place pile can be monitored. An alarm will be triggered when the cumulative displacement of the top of the cast-in-place pile exceeds the set value.

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