Construction method of temporary support for urban underground pipeline excavation

Abstract

The invention discloses a construction method of a temporary support for urban underground pipeline excavation. The method is implemented according to the sequence of route retesting, surface pavement excavation, steel sheet pile insertion, fertilizer groove layered excavation, supporting rod and steel sheet pile connection and supporting rod tightening, fertilizer groove excavation to an elevation layer, pipeline construction, fertilizer groove backfilling, supporting rod dismantling, steel sheet pile pulling out and asphalt pavement laying. The matched supporting device is composed of five detachable assemblies including a central fixing shaft, an extension sleeve and a supporting leg, the size can be flexibly adjusted according to the width of the fertilizer groove, and the supporting stability is guaranteed through threaded connection and a gear locking structure. The method has the advantages of being rapid in construction, wide in applicability, high in safety, capable of being repeatedly used and beneficial to civilized construction, the efficiency and safety of urban pipe network upgrading and reconstruction projects are effectively improved, and traffic influences are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of civil engineering, more particularly, to a construction method for temporary support of urban underground pipeline excavation. BACKGROUND

[0002] With the rapid development of urban construction, continuous upgrading and reconstruction of water supply and drainage, gas pipeline network, and gradual transition of power transmission and communication transmission from overhead form to underground pre-burying, urban roads frequently face excavation and reconstruction needs. Road excavation not only causes a sharp increase in traffic pressure, but also needs to solve the problem of temporary support of the trench during pipeline network construction - how to quickly, safely and stably support the trench after excavation to prevent surrounding soil landslide and trench deformation, which directly affects the overall efficiency and construction safety of pipeline network reconstruction projects.

[0003] The existing temporary support technology for trenches mostly uses traditional support equipment, which has defects such as complex assembly, poor adjustment flexibility, narrow application range, low construction efficiency, and some support devices cannot be reused, causing resource waste, and after disassembly, the site is messy, which is not conducive to civilized construction. Therefore, there is an urgent need for a temporary support construction method and device with efficient, flexible, safe and environmentally friendly characteristics to meet the needs of rapid construction of urban underground pipelines. SUMMARY

[0004] In view of the problems existing in the prior art, the purpose of the present application is to provide a construction method for temporary support of urban underground pipeline excavation, which realizes quick support and stable protection of the trench, improves construction efficiency, reduces traffic impact, and takes into account applicability, safety and economy.

[0005] The present application adopts the following technical solutions:

[0006] The construction method for temporary support of urban underground pipeline excavation comprises the following steps:

[0007] (1) Route re-measurement: accurately re-measure and locate the underground pipeline excavation route;

[0008] (2) Surface pavement excavation: excavate the surface pavement to a preset depth;

[0009]

[0009] (3) Insert steel sheet pile: insert a Larsen steel sheet pile along both sides of the re-measured route;

[0010] (4) First layer trench excavation: excavate the first layer of trench soil;

[0011] (5) connecting the support rod with the steel sheet pile and tightening the support rod: the support device with completed assembly and adjustment is laid in the fertilizer groove area at a preset interval, the support top of the support device is embedded into the groove of the Larsen steel sheet pile, the interval of the support device is preliminarily fixed, the support device is gradually stretched until the support device abuts against the soil on both sides, and each connecting part is tightened and locked by the gear locking structure;

[0012] (6) excavating the fertilizer groove to the pipeline laying elevation: the fertilizer groove is continuously excavated to the pipeline laying elevation;

[0013] (7) pipeline construction: the underground pipeline laying construction is carried out in the excavated fertilizer groove;

[0014] (8) backfilling of the fertilizer groove: after the pipeline construction is completed, the fertilizer groove is backfilled;

[0015] (9) removing the support rod: after the backfilling is completed, the gear locking structure is unlocked, and the support device is removed;

[0016] (10) removing the steel sheet pile: after the support device is removed, the Larsen steel sheet pile is removed;

[0017] (11) laying the asphalt pavement: the asphalt pavement is laid in the excavated area, and the construction is completed.

[0018] Further, the laying interval of the support device is determined according to the depth of the fertilizer groove and the stability of the soil.

[0019] Further, the support device comprises a central fixed shaft, an extension sleeve and a support leg, two extension sleeves are threadedly connected with two ends of the central fixed shaft, and each extension sleeve is threadedly connected with the support leg.

[0020] Further, the end of the support leg is provided with a support top, and the support top is embedded into the groove of the Larsen steel sheet pile.

[0021] Further, the central fixed shaft is provided with an inner thread one, one end of the extension sleeve is provided with an outer thread one corresponding to the inner thread one, the extension sleeve is provided with an inner thread two, and the support leg is provided with an outer thread two corresponding to the inner thread two.

[0022] Further, the central fixed shaft is provided with a transverse level and a vertical level, and the transverse level is located at the middle of the outer side of the central fixed shaft.

[0023] Further, the outer thread two of the support leg is fixed with a fixed shaft gear at the upper end, the height is adjusted according to the working condition, when the height meets the working condition requirement, the gear locking pin is sleeved into the fixed shaft gear.

[0024] Further, the support top is made of wood.

[0025] Beneficial effects

[0026] Good economic benefits: All five components of the support device can be disassembled and reused, reducing the cost of construction materials; the device has a simple structure, requires no complex processing, and has a low manufacturing cost.

[0027] Construction is fast and efficient: only two people are needed to assemble and disassemble the equipment, and the operation is simple; the construction process is clear and orderly, and the trench excavation and support can be carried out simultaneously, which greatly shortens the construction cycle and reduces the time spent on road occupancy.

[0028] Wide applicability: The extension sleeve can be selected in different lengths according to the width of the trough, and the height of the support leg can be flexibly adjusted through the thread to adapt to the construction needs of troughs of different specifications.

[0029] High safety: The support device has a strong load-bearing capacity, the gear locking structure effectively prevents the device from loosening, and the embedded connection between the support top support and the steel sheet pile avoids lateral sliding, providing double protection for soil stability and preventing trench deformation and collapse. Attached Figure Description

[0030] Figure 1 This is a construction flowchart of an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram illustrating the construction process of one embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of the adjustment of the support device according to an embodiment of the present invention;

[0033] Figure 4 This is a schematic diagram of a support device according to an embodiment of the present invention;

[0034] Figure 5 This is a partial schematic diagram of a support device according to an embodiment of the present invention;

[0035] Figure 6 This is a schematic diagram of an extension sleeve according to an embodiment of the present invention;

[0036] Figure 7 This is a schematic diagram of a combination of a support leg, a fixed-axis gear, and a gear locking bolt according to an embodiment of the present invention;

[0037] Figure 8 This is a schematic diagram of a fixed-axis gear according to an embodiment of the present invention;

[0038] Figure 9 This is a schematic diagram of a gear locking bolt according to an embodiment of the present invention. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0040] As shown in the figure, this invention discloses a construction method for temporary support during urban underground pipeline excavation, comprising the following steps:

[0041] (1) Route re-survey: Accurately re-survey and locate the underground pipeline excavation route;

[0042] Specifically, a total station was used to re-measure the excavation route, determine the route centerline and the excavation boundaries on both sides, and mark the insertion positions of the Larssen sheet piles.

[0043] (2) Surface road excavation: Excavate the surface road to the preset depth;

[0044] Use a small excavator to excavate the surface asphalt road surface and transport the excavated waste to a designated area.

[0045] (3) Inserting steel sheet piles: Insert 5 Larssen steel sheet piles on both sides along the re-measured route;

[0046] 400-type Larssen steel sheet piles were selected and inserted at certain intervals along both sides of the route to the target depth, extending a certain distance beyond the bottom of the trench to ensure protective stability.

[0047] (4) Excavation of the first layer of fertilizer trench 10: Excavate the first layer of fertilizer trench soil;

[0048] (5) Connect the support rod to the sheet pile and tighten the support rod: Lay the assembled and adjusted support device in the trench area at the preset spacing, so that the support top of the support device is embedded in the trench of the Larssen sheet pile, initially fix the spacing of the support device, gradually extend the support device until the support device supports the soil on both sides, tighten each connection part and lock it through the gear locking structure.

[0049] (6) Excavation of the trench to the elevation level: Continue to excavate the trench in layers to the elevation level for pipeline laying;

[0050] (7) Pipeline construction: Underground pipeline 11 will be laid in the excavated trench;

[0051] (8) Backfilling of the trench: After the pipeline construction is completed, the trench is backfilled and compacted using a small tamping machine;

[0052] (9) Remove the support rod: After backfilling is completed, unlock the gear locking structure and remove the support device;

[0053] (10) Removal of sheet piles: After removing the support device, remove the Larssen sheet piles;

[0054] (11) Asphalt pavement laying: Asphalt pavement is laid in the excavated area to complete the construction.

[0055] This invention is beneficial for civilized construction: each component can be disassembled, classified and stored, and neatly and attractively packed on site, making transportation simple and efficient.

[0056] In one embodiment of the present invention, the laying spacing of the support device is determined according to the depth of the trench and the stability of the soil.

[0057] In one embodiment of the present invention, the support device includes a central fixed shaft 1, an extension sleeve 2 and a support leg 3. The two extension sleeves 2 are threaded to both ends of the central fixed shaft 1, and each extension sleeve 2 is threaded to the support leg 3.

[0058] The support device components are made of Q235 steel, and the support leg 3 is made of steel pipe with a diameter of 100mm and a wall thickness of 3.2mm, which has a strong load-bearing capacity and can effectively support the side slip of the soil.

[0059] In one embodiment of the present invention, a support top support 4 is installed at the end of the support leg 3, and the support top support 4 is embedded in the groove 51 of the Larssen sheet pile 5.

[0060] In one embodiment of the present invention, the central fixed shaft 1 is provided with an internal thread 1, one end of the extension sleeve 2 is provided with an external thread 21 corresponding to the internal thread 1, the extension sleeve 2 is provided with an internal thread 2, and the support leg 3 is provided with an external thread 31 corresponding to the internal thread 2.

[0061] In one embodiment of the present invention, the central fixed shaft 1 is provided with a horizontal level 6 and a vertical level 7, with the horizontal level 6 located at the middle of the outer side of the central fixed shaft 1.

[0062] In one embodiment of the present invention, a fixed-axis gear 8 is fixed at the upper end of the external thread of the support leg 3. The height is adjusted according to the working conditions. When the height meets the working conditions, the gear locking bolt 9 is put into the fixed-axis gear 8 to lock the support device and prevent the support device from loosening due to the rotation of the support leg thread.

[0063] The fixed-axis gear 8 includes a gear ring 81, with circumferentially distributed teeth 82 on the outer side of the gear ring 81. The gear locking bolt 9 includes a gear ring 91, with two sets of teeth 92 inside the gear ring 91.

[0064] The fixed-axis gear 8 has a diameter of 116mm and is fixed to the support leg 3 using a welding machine; the gear locking bolt 9 has a diameter of 126mm and is inserted into the fixed-axis gear 8 during fixing.

[0065] In one embodiment of the present invention, the supporting top bracket 4 is made of wood.

[0066] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concept, should be covered within the scope of protection of the present invention.

Claims

1. A construction method for temporary supports during excavation of urban underground pipelines, characterized in that, Includes the following steps: (1) Route re-survey: Accurately re-survey and locate the underground pipeline excavation route; (2) Surface road excavation: Excavate the surface road to the preset depth; (3) Inserting steel sheet piles: Insert Larssen steel sheet piles on both sides along the re-surveyed route; (4) Excavation of the first layer of fertilizer trench: Excavate the first layer of fertilizer trench soil; (5) Connect the support rod to the sheet pile and tighten the support rod: Lay the assembled and adjusted support device in the trench area at the preset spacing, so that the support top of the support device is embedded in the trench of the Larssen sheet pile, initially fix the spacing of the support device, gradually extend the support device until the support device supports the soil on both sides, tighten each connection part and lock it through the gear locking structure. (6) Excavation of the trench to the elevation level: Continue to excavate the trench in layers to the elevation level for pipeline laying; (7) Pipeline construction: Underground pipeline laying construction is carried out in the excavated trench; (8) Backfilling of the trench: After the pipeline construction is completed, the trench is backfilled; (9) Remove the support rod: After backfilling is completed, unlock the gear locking structure and remove the support device; (10) Removal of sheet piles: After removing the support device, remove the Larssen sheet piles; (11) Asphalt pavement laying: Asphalt pavement is laid in the excavated area to complete the construction.

2. The construction method for temporary support during excavation of urban underground pipelines according to claim 1, characterized in that, The spacing of the support devices is determined based on the depth of the trench and the stability of the soil.

3. The construction method for temporary support during excavation of urban underground pipelines according to claim 1, characterized in that, The support device includes a central fixed shaft, extension sleeves, and support legs. Two extension sleeves are threaded to both ends of the central fixed shaft, and each extension sleeve is threaded to the support leg.

4. The construction method for temporary support during excavation of urban underground pipelines according to claim 3, characterized in that, A support bracket is installed at the end of the support leg, and the support bracket is embedded into the groove of the Larssen sheet pile.

5. The construction method for temporary support during excavation of urban underground pipelines according to claim 3, characterized in that, The central fixed shaft has an internal thread 1, one end of the extension sleeve has an external thread 1 corresponding to the internal thread 1, the extension sleeve has an internal thread 2, and the support leg has an external thread 2 corresponding to the internal thread 2.

6. The construction method for temporary support during excavation of urban underground pipelines according to claim 3, characterized in that, The central fixed axis is equipped with a horizontal level and a vertical level, with the horizontal level located at the middle of the outer side of the central fixed axis.

7. The construction method for temporary support during excavation of urban underground pipelines according to claim 5, characterized in that, The upper end of the external thread of the support leg is fixed with a fixed shaft gear. The height is adjusted according to the working conditions. When the height meets the working conditions, the gear locking bolt is put into the fixed shaft gear.

8. The construction method for temporary support during excavation of urban underground pipelines according to claim 4, characterized in that, The supporting top is made of wood.

9. The construction method for temporary support during urban underground pipeline excavation according to claim 7, characterized in that, The fixed-axis gear includes a gear ring one, with circumferentially distributed teeth one on the outer side of the gear ring one. The gear locking bolt includes a gear ring two, with two sets of teeth two inside the gear ring two.

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