Composite structure and method of temporary pavement and pipeline suspension using cast-in-place piles and large-span temporary beams

Abstract

The present invention provides a cast-in-place pile and a large-span military beam temporary pavement and pipeline suspension combined structure and method, two rows of cast-in-place piles are vertically arranged at the bottom of the foundation pit, a crown beam and military beam foundation is arranged on the top of the cast-in-place pile, one side of the crown beam and military beam foundation is fixedly connected to the temporary pavement structure support beam through a plurality of temporary pavement structure cross braces, and the other side is vertically arranged with a bridge abutment foundation and retaining wall, a temporary pavement structure diagonal brace is arranged between the cast-in-place pile and the temporary pavement structure support beam; the anchor rod waist beam is connected to the cast-in-place pile, and the prestressed anchor rod is driven on the anchor rod waist beam; the two ends of the military beam are arranged on the temporary pavement bearing structure, a plurality of pipeline suspension beams are arranged below the military beam, and the pipeline to be relocated is suspended between the pipeline suspension beam and the military beam, and a pavement structure is arranged above the military beam. The present invention does not need to set up a temporary column structure, and ensures the passage of vehicles and the relocation of pipelines while ensuring safety, speeds up the construction progress, and has a high promotion value.

Description

Technical Field

[0001] The invention belongs to the technical field of subway and civil construction engineering, and particularly relates to a cast-in-place pile and large-span temporary road surface and pipeline suspension combined structure and method. Background Art

[0002] With the development of social economy and technology and the improvement of people's living standards, more and more subways and civil buildings are being built. However, due to the increasing utilization of urban space, many projects are located in densely built areas with complex surrounding houses and environment, and there are few routes around the foundation pit for traffic relief and pipeline relocation.

[0003] In the case of a large-span foundation pit construction, a temporary flow control structure is set across the middle of the foundation pit. When the span of the foundation pit is large, temporary columns can be set in the middle of the foundation pit to reduce risks. However, the setting of temporary columns will slow down the construction progress and increase the risk of temporary column construction.

[0004] In order to ensure traffic relief and pipeline relocation during foundation pit construction, the present invention provides a combined structure of cast-in-place piles and large-span temporary beams combined with temporary pavement and pipeline suspension. Summary of the invention

[0005] In order to solve the problem of traffic diversion and pipeline relocation around the foundation pit when the foundation pit is excavated in a complex surrounding environment, the present invention provides a combined structure and method of cast-in-place piles and large-span military beams for temporary pavement and pipeline suspension, which is suitable for foundation pit excavation projects with complex surrounding environments and lack of routes for traffic diversion and pipeline relocation. The present invention does not need to set up a temporary column structure, avoiding slowing down the construction progress and increasing the risk of temporary column construction due to the setting of temporary columns; and combines the flow regulation path and pipeline suspension into one, which can reduce the construction cost and shorten the construction period.

[0006] In order to achieve the above purpose, the technical solution adopted by the embodiment of the present invention is as follows:

[0007] In the first aspect, the present invention provides a composite structure of a temporary pavement and pipeline suspension of cast-in-place piles and large-span military beams, including a military beam and a temporary pavement bearing structure; wherein the temporary pavement bearing structure includes cast-in-place piles, a crown beam and military beam foundation, a temporary pavement structure cross brace, a temporary pavement structure support beam, and an anchor waist beam, two rows of cast-in-place piles are vertically arranged at the bottom of a foundation pit, the crown beam and military beam foundation is arranged on the top of the cast-in-place piles, and one side of the crown beam and military beam foundation is connected to the temporary pavement structure through a plurality of cross braces of the temporary pavement structure. The temporary pavement structure support beam is fixedly connected, and a bridge foundation and retaining wall under the abutment is vertically arranged above the other side. A temporary pavement structure diagonal brace is arranged between the cast-in-place piles and the temporary pavement structure support beam; the anchor waist beam is connected to the cast-in-place piles, and the prestressed anchor rods are driven on the anchor waist beam; both ends of the military beam are arranged on the temporary pavement bearing structure, and a number of pipeline suspension beams are arranged below the military beam. The pipelines that need to be relocated are suspended between the pipeline suspension beams and the military beam, and a pavement structure is arranged above the military beam.

[0008] Preferably, the abutment slab pillow beam is arranged on the road surface beside the foundation pit, one end of the abutment slab is placed on the abutment slab pillow beam, and the other end is placed on the foundation and retaining wall under the abutment, and the abutment slab is connected to the road surface structure.

[0009] Preferably, the prestressed anchor rods are also driven on the foundation of the crown beam and temporary beam.

[0010] Preferably, the crown beam and temporary beam foundation is mutually anchored with the cross bracing steel bars of the temporary pavement structure.

[0011] Preferably, the anchor rod waist beam and the cast-in-place pile are welded by reinforcing bar insertion.

[0012] Preferably, the cast-in-place piles are ∅800 bored cast-in-place piles, the crown beam and temporary beam foundation is 0.8m high × 1.3m wide, the temporary pavement structure cross brace is 0.8m high × 0.5m wide, the temporary pavement structure supporting beam is 0.8m high × 1.0m wide, and the foundation and retaining wall under the abutment is 0.3m wide × 1.6m high.

[0013] In a second aspect, the present invention further provides a construction method of a cast-in-place pile and a large-span temporary road surface and pipeline suspension combined structure, the method comprising the following steps:

[0014] Step S1, laying out and positioning according to the design drawing, and constructing cast-in-place piles;

[0015] Step S2, excavation, construction of the foundation of the crown beam and temporary beam and the foundation and retaining wall under the abutment, and reservation of the steel bar joints anchored with the temporary pavement structure cross brace;

[0016] Step S3, constructing prestressed anchor rods on the foundation of the crown beam and the auxiliary beam;

[0017] Step S4, continue excavating to the junction of the temporary pavement structure diagonal support and the cast-in-place pile, and reserve a mutually anchored steel bar joint;

[0018] Step S5, continue to dig downwards, construct the first anchor beam, the anchor beam and the cast-in-place pile are constructed by welding with steel bars, after the anchor beam reaches the design strength, construct the prestressed anchor, and then tension the prestressed anchor to the prestressed locking value to lock the anchor prestress; then return to construct the temporary pavement structure cross brace, temporary pavement structure support beam, temporary pavement structure diagonal brace, bridge abutment slab pillow beam and bridge abutment slab, one side of the bridge abutment slab (6) is placed on the bridge abutment slab pillow beam, and the other side is placed on the foundation and retaining wall under the abutment;

[0019] Step S6, after the temporary pavement structure cross braces, temporary pavement structure support beams, and temporary pavement structure diagonal braces reach the designed strength, the military beams, pavement structure, and pipeline suspension beams are constructed, and then the pipelines to be relocated are suspended between the pipeline suspension beams and the military beams;

[0020] Step S7, continue to excavate the soil layer by layer, construct each anchor beam, the anchor beam and the cast-in-place pile are constructed by welding steel bars, after the anchor beam reaches the design strength, construct the prestressed anchor, and then tension the prestressed anchor to the prestressed locking value to perform anchor prestress locking;

[0021] Step S8, continue excavation until the bottom of the pit is sealed, and then construct the secondary lining structure;

[0022] Step S9, after the construction of the secondary lining structure is completed, the pipeline is relocated, the foundation and retaining wall under the abutment, the foundation of the crown beam and the temporary beam, the abutment slab, the pavement structure, the pipeline suspension beam, the temporary pavement structure cross brace, the temporary pavement structure support beam, the temporary pavement structure diagonal brace, the abutment slab pillow beam are dismantled, and the foundation pit is backfilled to the ground;

[0023] Step S10, leveling the ground and restoring the road surface, and now all foundation pit construction is completed.

[0024] Preferably, in step S2, excavation is carried out to 0.5 m below the position of the crown beam and temporary beam foundation to construct the crown beam and temporary beam foundation and the foundation and retaining wall under the abutment.

[0025] Preferably, in step S5, excavation is continued downward to 0.5 m below the bottom elevation of the first anchor beam to construct the first anchor beam.

[0026] Preferably, in step S7, the soil is excavated downward in layers to a position 0.5 m below the bottom elevation of each anchor beam, and each anchor beam is constructed.

[0027] The present invention has the following beneficial effects:

[0028] The present invention provides a combined structure and method of a temporary pavement and pipeline suspension of cast-in-place piles and large-span military temporary beams. The structure is a temporary flow regulation system, which adopts a combined structure of cast-in-place piles and large-span military temporary beams combined with a temporary pavement and pipeline suspension. The structure is suitable for foundation pit excavation projects with complex surrounding environments, lack of traffic relief and pipeline relocation routes.

[0029] The structural width of the present invention meets the width of the foundation pit setting, and the temporary pavement bearing structure is used as a support to ensure the safety of the flow regulation system; the temporary pavement is used to ensure the passage of vehicles, and the pipeline relocation is ensured by the pipeline suspension beam below; the abutment slab is connected to the pavement structure through the foundation and retaining wall under the abutment to ensure the passage of vehicles. Generally, a temporary flow regulation system is set up in a foundation pit with a larger span, and a temporary column needs to be set in the middle of the foundation pit to be used as a span reduction, and the flow regulation path and pipeline suspension are carried out separately. The present invention does not need to set up a temporary column structure, which avoids slowing down the construction progress and increasing the risk of temporary column construction due to the setting of temporary columns, and only adds part of the temporary pavement foundation. While ensuring safety, it ensures the passage of vehicles and the relocation of pipelines, speeds up the construction progress, and has a high promotion value; and the flow regulation path and pipeline suspension are combined into one, which can reduce the construction cost and shorten the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 A plan view of a combined structure of cast-in-place piles and large-span temporary road surface and pipeline suspension provided by an embodiment of the present invention;

[0032] Figure 2 A cross-sectional view of a combined structure of a cast-in-place pile and a large-span temporary road surface and pipeline suspension provided by an embodiment of the present invention;

[0033] Figure 3 A detailed diagram of a temporary pavement bearing structure provided by an embodiment of the present invention;

[0034] Figure 4 A plan view of a temporary pavement bearing structure provided in an embodiment of the present invention.

[0035] Description of reference numerals:

[0036] 1. Military temporary beam; 2. Secondary lining structure; 3. Cast-in-place piles; 4. Foundation under the abutment and retaining wall; 5. Crown beam and foundation of the military temporary beam; 6. Abutment slab; 7. Pavement structure; 8. Pipeline suspension beam; 9. Temporary pavement structure cross brace; 10. Temporary pavement structure supporting beam; 11. Temporary pavement structure diagonal brace; 12. Abutment slab pillow beam; 13. Prestressed anchor rod; 14. Anchor rod waist beam; 15. Pipelines that need to be relocated. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] This embodiment provides a composite structure of cast-in-place piles and large-span temporary road surface and pipeline suspension. Figures 1 to 4 As shown, it includes a temporary beam 1 and a temporary pavement bearing structure; wherein the temporary pavement bearing structure includes cast-in-place piles 3, a crown beam and temporary beam foundation (5), a temporary pavement structure cross brace (9), a temporary pavement structure support beam (10), and an anchor rod waist beam (14). Two rows of cast-in-place piles 3 are vertically arranged at the bottom of the foundation pit, and the crown beam and temporary beam foundation 5 is arranged on the top of the cast-in-place piles 3. One side of the crown beam and temporary beam foundation 5 is fixedly connected to the temporary pavement structure support beam 10 through a plurality of temporary pavement structure cross braces 9, and the other side is vertically arranged above the bridge abutment foundation and support beam. Earth wall 4, a temporary pavement structure diagonal brace 11 is arranged between the cast-in-place pile 3 and the temporary pavement structure support beam 10; the anchor waist beam 14 is connected to the cast-in-place pile 3 (the number of anchor waist beams 14 is reasonably set according to the foundation pit depth and calculation), and the prestressed anchor 13 is driven on the anchor waist beam 14; both ends of the military beam 1 are arranged on the temporary pavement bearing structure, and a plurality of linearly arranged pipeline suspension beams 8 are arranged below the military beam, and the pipeline 15 to be relocated is suspended between the pipeline suspension beam 8 and the military beam 1, and a pavement structure 7 is arranged above the military beam.

[0039] The abutment slab bolster 12 is arranged on the road surface beside the foundation pit. One end of the abutment slab 6 is placed on the abutment slab bolster 12, and the other end is placed on the foundation and retaining wall 4 under the abutment. The abutment slab 6 is connected to the road surface structure 7.

[0040] The prestressed anchor rod 13 is also driven on the crown beam and temporary beam foundation 5.

[0041] The crown beam and temporary beam foundation 5 and the temporary pavement structure cross brace 9 are mutually anchored by steel bars.

[0042] The anchor rod waist beam 14 and the cast-in-place pile 3 are welded by reinforcing bar insertion.

[0043] The cast-in-place piles 3 are ∅800 bored cast-in-place piles, the crown beam and temporary beam foundation 5 is 0.8m high × 1.3m wide, the temporary pavement structure cross brace 9 is 0.8m high × 0.5m wide, the temporary pavement structure supporting beam 10 is 0.8m high × 1.0m wide, and the foundation and retaining wall 4 under the abutment is 0.3m wide × 1.6m high.

[0044] This embodiment also provides a construction method of a cast-in-place pile and a large-span temporary road surface and pipeline suspension combined structure, the method comprising the following steps:

[0045] Step S1, lay out and position according to the design drawing, and construct the cast-in-place piles 3.

[0046] Step S2, excavate to 0.5m below the position of the crown beam and temporary beam foundation 5 to construct the crown beam and temporary beam foundation 5 and the foundation and retaining wall 4 under the abutment, and reserve the steel bar joints anchored with the temporary pavement structure cross brace 9.

[0047] Step S3, constructing the prestressed anchor rods 13 on the crown beam and temporary beam foundation 5.

[0048] Step S4, continue excavating to the junction of the temporary pavement structure diagonal support 11 and the cast-in-place pile 3, and reserve a mutually anchored steel bar joint.

[0049] Step S5, continue to excavate downward to 0.5m below the bottom elevation of the first anchor beam 14, construct the first anchor beam 14, the anchor beam 14 and the cast-in-place pile 3 are constructed by welding with steel bars, and after the anchor beam 14 reaches the design strength, construct the prestressed anchor 13, and then tension the prestressed anchor 13 to the prestressed locking value to perform anchor prestress locking; then return to construct the temporary pavement structure cross brace 9, the temporary pavement structure supporting beam 10, the temporary pavement structure diagonal brace 11, the abutment slab pillow beam 12 and the abutment slab 6, one side of the abutment slab 6 is placed on the abutment slab pillow beam 12, and the other side is placed on the foundation and retaining wall 4 under the abutment.

[0050] Step S6, after the temporary pavement structure cross brace 9, temporary pavement structure supporting beam 10, and temporary pavement structure diagonal brace 11 reach the design strength, construct the military beam 1, pavement structure 7, and pipeline suspension beam 8, and then suspend the pipeline 15 to be relocated between the pipeline suspension beam 8 and the military beam 1.

[0051] Step S7, continue to excavate the soil layer by layer to 0.5m below the bottom elevation of each anchor beam 14, construct each anchor beam 14, and weld the anchor beam 14 and the bored pile 3 with steel bars. After the anchor beam 14 reaches the designed strength, construct the prestressed anchor 13, and then tension the prestressed anchor 13 to the prestressed locking value to perform anchor prestress locking (the number of anchor beams 14 is reasonably set according to the depth of the foundation pit and calculation).

[0052] Step S8, continue excavating until the pit bottom is sealed, and then construct the secondary lining structure 2.

[0053] Step S9, after the construction of the secondary lining structure 2 is completed, the pipeline is relocated, the foundation and retaining wall 4 under the abutment, the foundation of the crown beam and temporary beam 5, the abutment slab 6, the pavement structure 7, the pipeline suspension beam 8, the temporary pavement structure cross brace 9, the temporary pavement structure supporting beam 10, the temporary pavement structure diagonal brace 11, and the abutment slab pillow beam 12 are dismantled, and the foundation pit is backfilled to the ground.

[0054] Step S10, leveling the ground and restoring the road surface, and now all foundation pit construction is completed.

[0055] It can be seen from the above technical scheme that this embodiment provides a combined structure and construction method of cast-in-place piles and large-span military beams for temporary pavement and pipeline suspension. The structural width meets the width of the foundation pit, and the temporary pavement bearing structure is used as a support to ensure the safety of the flow regulation system; the temporary pavement is used to ensure the passage of vehicles, and the pipeline suspension beam is used below to ensure the relocation of pipelines; the abutment slab is connected to the pavement structure through the foundation and retaining wall under the abutment to ensure the passage of vehicles. Generally, a temporary flow regulation system is set up for a foundation pit with a large span, and a temporary column needs to be set up in the middle of the foundation pit to reduce the span, and the flow regulation path and pipeline suspension are carried out separately. The present invention does not need to set up a temporary column structure, avoids slowing down the construction progress and increasing the risk of temporary column construction due to the setting of temporary columns, and only adds part of the temporary pavement foundation. While ensuring safety, it ensures the passage of vehicles and the relocation of pipelines, speeds up the construction progress, and has a high promotion value; and the flow regulation path and pipeline suspension are combined into one, which can reduce the construction cost and shorten the construction period.

[0056] The above embodiments of the present invention are described in detail through examples, but the contents described are only exemplary embodiments of the embodiments of the present invention and cannot be considered to limit the scope of implementation of the embodiments of the present invention. The protection scope of the embodiments of the present invention is defined by the claims. Anyone who utilizes the technical solutions described in the embodiments of the present invention, or who, inspired by the technical solutions of the embodiments of the present invention, designs similar technical solutions within the essence and protection scope of the embodiments of the present invention to achieve the above technical effects, or who makes equal changes and improvements to the scope of application, shall still fall within the scope of protection covered by the patent of the embodiments of the present invention.

Claims

1. A construction method for a temporary pavement and pipeline suspension combined structure of cast-in-place piles and large-span military temporary beams, characterized in that: The construction method is applied to a cast-in-place pile and large-span military beam temporary pavement and pipeline suspension combination structure, the combination structure comprising a military beam (1) and a temporary pavement bearing structure; wherein the temporary pavement bearing structure comprises cast-in-place piles (3), a crown beam and military beam foundation (5), a temporary pavement structure cross brace (9), a temporary pavement structure support beam (10), and an anchor rod waist beam (14), two rows of cast-in-place piles (3) are vertically arranged at the bottom of a foundation pit, the top of the cast-in-place pile (3) is provided with the crown beam and military beam foundation (5), one side of the crown beam and military beam foundation (5) is connected to the temporary pavement structure support beam through a plurality of temporary pavement structure cross braces (9). The beam (10) is fixedly connected, and a foundation and retaining wall (4) under the abutment is vertically arranged above the other side; a temporary pavement structure diagonal brace (11) is arranged between the cast-in-place pile (3) and the temporary pavement structure supporting beam (10); the anchor rod waist beam (14) is connected to the cast-in-place pile (3), and the prestressed anchor rod (13) is driven on the anchor rod waist beam (14); both ends of the military beam (1) are arranged on the temporary pavement bearing structure, a plurality of pipeline suspension beams (8) are arranged below the military beam, and the pipeline (15) to be relocated is suspended between the pipeline suspension beam (8) and the military beam (1), and a pavement structure (7) is arranged above the military beam; The method comprises the following steps: Step S1, laying out and positioning according to the design drawing, and constructing cast-in-place piles (3); Step S2, excavating the foundation of the crown beam and temporary beam (5) and the foundation and retaining wall under the abutment (4), and reserving the steel bar joints for mutual anchoring with the temporary pavement structure cross brace (9); Step S3, constructing prestressed anchor rods (13) on the crown beam and military beam foundation (5); Step S4, continue excavating to the junction of the temporary pavement structure diagonal support (11) and the cast-in-place pile (3), and reserve a mutually anchored steel bar joint; Step S5, continue to dig downwards, construct the first anchor beam (14), the anchor beam (14) and the cast-in-place pile (3) are constructed by welding with steel bars, after the anchor beam (14) reaches the design strength, construct the prestressed anchor (13), and then tension the prestressed anchor (13) to the prestressed locking value to perform anchor prestress locking; then return to construct the temporary pavement structure cross brace (9), the temporary pavement structure support beam (10), the temporary pavement structure diagonal brace (11), the abutment slab pillow beam (12) and the abutment slab (6), one side of the abutment slab (6) is placed on the abutment slab pillow beam (12), and the other side is placed on the foundation and retaining wall (4) under the abutment; Step S6, after the temporary pavement structure cross brace (9), the temporary pavement structure support beam (10), and the temporary pavement structure diagonal brace (11) have reached the designed strength, the military beam (1), the pavement structure (7), and the pipeline suspension beam (8) are constructed, and then the pipeline (15) to be relocated is suspended between the pipeline suspension beam (8) and the military beam (1); Step S7, continue to excavate the soil layer by layer downward, construct each anchor beam (14), the anchor beam (14) and the cast-in-place pile (3) are constructed by welding with steel bars, after the anchor beam (14) reaches the design strength, construct the prestressed anchor (13), and then tension the prestressed anchor (13) to the prestressed locking value to perform anchor prestress locking; Step S8, continue excavation until the pit bottom is sealed, and then construct the secondary lining structure (2); Step S9, after the construction of the secondary lining structure (2) is completed, the pipeline is relocated, the foundation and retaining wall (4) under the abutment, the foundation of the crown beam and the temporary beam (5), the abutment slab (6), the pavement structure (7), the pipeline suspension beam (8), the temporary pavement structure cross brace (9), the temporary pavement structure support beam (10), the temporary pavement structure diagonal brace (11), the abutment slab pillow beam (12) are dismantled, and the foundation pit is backfilled to the ground; Step S10, leveling the ground and restoring the road surface, and now all foundation pit construction is completed.

2. The construction method of a cast-in-place pile and large-span temporary road surface and pipeline suspension combined structure according to claim 1 is characterized in that: The abutment slab bolster (12) is arranged on the road surface beside the foundation pit, one end of the abutment slab (6) is placed on the abutment slab bolster (12), and the other end is placed on the foundation and retaining wall (4) under the abutment, and the abutment slab (6) is connected to the road surface structure (7).

3. The construction method of a cast-in-place pile and large-span temporary road surface and pipeline suspension combined structure according to claim 1 is characterized in that: The prestressed anchor rod (13) is also driven on the crown beam and military beam foundation (5).

4. The construction method of a cast-in-place pile and large-span temporary road surface and pipeline suspension combined structure according to claim 1 is characterized in that: The crown beam and temporary beam foundation (5) and the temporary pavement structure cross brace (9) are mutually anchored by steel bars.

5. The construction method of a cast-in-place pile and large-span temporary road surface and pipeline suspension combined structure according to claim 1 is characterized in that: The anchor rod waist beam (14) and the cast-in-place pile (3) are welded by inserting steel bars.

6. The construction method of a cast-in-place pile and large-span temporary road surface and pipeline suspension combined structure according to claim 1 is characterized in that: The cast-in-place piles (3) are bored cast-in-place piles with a diameter of ∅800, the crown beam and temporary beam foundation (5) is 0.8 m high and 1.3 m wide, the temporary pavement structure cross brace (9) is 0.8 m high and 0.5 m wide, the temporary pavement structure support beam (10) is 0.8 m high and 1.0 m wide, and the foundation and retaining wall (4) under the abutment is 0.3 m wide and 1.6 m high.

7. The construction method of a cast-in-place pile and large-span temporary road surface and pipeline suspension combined structure according to claim 1 is characterized in that: In step S2, excavation is carried out to 0.5 m below the position of the crown beam and military temporary beam foundation (5), and the crown beam and military temporary beam foundation (5) and the foundation and retaining wall (4) under the abutment are constructed.

8. The construction method of a cast-in-place pile and large-span temporary road surface and pipeline suspension combined structure according to claim 1 is characterized in that: In step S5, excavation is continued downward to a point 0.5 m below the bottom elevation of the first anchor beam (14), and the first anchor beam (14) is constructed.

9. The construction method of a cast-in-place pile and large-span temporary road surface and pipeline suspension combined structure according to claim 1, characterized in that: In step S7, the soil is excavated downward in layers to a point 0.5 m below the bottom elevation of each anchor beam (14), and each anchor beam (14) is constructed.

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