Underground pipeline protection construction method and system across open cut station foundation pit

Abstract

The invention discloses an underground pipeline protection construction method and system across an open cut station foundation pit, two triangular supports are oppositely arranged and abut against a wall body, and meanwhile, two connecting plates and hydraulic push rods are oppositely arranged and abut against a bearing beam; and meanwhile, the triangular supports are arranged on the lower surface, located at one end of the pit opening of the foundation pit, of the supporting platform and attached to and abut against the wall body, so that the cantilever of the bearing beam is reduced, and meanwhile the bearing beam can be supported by the supporting platform. The wall is supported to a certain degree, then the overall structure of the system is stable, meanwhile, acting force borne by the bearing beam when the pipeline is suspended is shared through the auxiliary carrying frame and the supporting platform, and the structure of the system is stable through mutual limiting and interlocking of the auxiliary carrying frame, the supporting platform and the bearing beam.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and particularly relates to a construction method and system for protecting underground pipelines across the foundation pit of an open-cut station. Background Art

[0002] During subway construction, pipelines across the foundation pit are relocated to avoid damage to the pipelines and affect their normal functions. Among them, for pipelines across the foundation pit, in the case where relocation is not possible, in-situ protection measures are usually adopted.

[0003] In the prior art, a suspension protection method is usually adopted. A bearing beam is erected in the space above the pipeline, and the bearing beam spans across the foundation pit. On the lower side, structures such as steel wires, cables or steel bars are used to suspend the pipeline, so as to protect the pipeline in-situ. However, there are still some problems to be improved when implementing this method:

[0004] 1. If the foundation pit has a long span, a long bearing beam is required to span across the foundation pit. As a result, when the bearing beam suspends the pipeline, the cantilever of the beam body far from the two side walls of the foundation pit is long. Consequently, the moment received by the beam body of the bearing beam farther away from the foundation pit wall is greater, which may cause the beam body of the bearing beam to bend and deform, leading to unstable suspension of the pipeline and posing a safety hazard.

[0005] 2. If there are other pipelines vertically below the pipeline, the bearing beam needs to suspend the two pipelines. In the prior art, multiple suspension structures such as steel wires, cables or steel bars are arranged at intervals on the bearing beam to suspend the two pipelines respectively, resulting in a large acting force on the bearing beam and prone to bending deformation or damage.

[0006] Therefore, there is an urgent need for a pipeline protection construction method and system that can stably protect pipelines across the foundation pit, is relatively simple to install and disassemble, and is not prone to bending or damage due to a large cantilever or a large acting force. Summary of the Invention

[0007] The purpose of the present invention is to provide a construction method and system for protecting underground pipelines across the foundation pit of an open-cut station to solve the above technical problems.

[0008] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0009] A construction method for protecting underground pipelines across the foundation pit of an open-cut station includes the following steps:

[0010] Step 1: According to the construction design drawings, conduct a survey of the construction site and formulate a foundation pit excavation plan;

[0011] Step 2: According to the on-site investigation results, confirm the pipeline distribution and types, formulate a pipeline protection plan, and divide the pipeline protection measures into in-situ suspension protection and relocation protection;

[0012] Step 3: Excavate the foundation pit according to the excavation plan until the pipeline is completely exposed;

[0013] Step 4: Install the suspension structure. Support platforms are respectively set on the two side walls of the pit mouth on the upper side of the foundation pit. The lower surface of the support platform extends downward to form a triangular support with a right triangle structure, and it is set inside the wall. One inner wall of the triangular support abuts and fits against the inner wall of the foundation pit. The two support platforms are arranged oppositely, and the side surface of the triangular support abuts against the inner surface of the wall;

[0014] Lift and install the bearing beam onto the two support platforms, and the two end faces are respectively detachably connected to the two support platforms;

[0015] Step 5: Arrange multiple half sleeves under the pipeline, and the inner wall of the half sleeve abuts against the outer wall of the pipeline. The half sleeve surrounds the lower half pipe wall of the pipeline. Both end faces of the half sleeve facing the bearing beam are connected to the bearing beam through connecting rods;

[0016] Step 6: Continue to excavate the foundation pit.

[0017] Preferably, in Step 2, it is necessary to confirm whether there is a pipeline directly below the pipeline, and formulate a pipeline suspension protection plan according to the investigation results.

[0018] Preferably, in Step 4, if it is confirmed in Step 2 that there is no pipeline directly below the pipeline, then install the support platform and the bearing beam according to the method in Step 4;

[0019] If there is still one pipeline in Step 2, then according to the method in Step 4, first install the support platforms on both sides, and then install sub-load frames on the inclined surfaces of the triangular supports of the support platforms on both sides respectively, and the two sub-load frames are arranged oppositely;

[0020] Preferably, in Step 6, if the sub-load frame is installed in Step 4, then continue to excavate the foundation pit until the pipeline directly below is completely exposed, and set multiple spaced half sleeves under it;

[0021] The half sleeves at both ends of the upper pipeline are respectively connected to the two sub-load frames through steel ropes, and the multiple half sleeves of the lower pipeline are connected to the multiple half sleeves of its upper pipeline through steel ropes;

[0022] Continue to excavate the foundation pit.

[0023] Preferably, in Step 6, when there are two pipelines, the lower side of the half sleeve in the middle of the upper pipeline is not connected to the half sleeve of the lower pipeline.

[0024] A pipeline protection system includes a bearing beam, two support platforms, a plurality of connecting rods, and a plurality of half sleeves. The two support platforms are oppositely arranged on both sides of the foundation pit, and their lower surfaces are in contact with the ground on the upper side of the foundation pit. One end of the support platform is provided with a triangular support. The inclined surface of the triangular support is inclined towards the bottom of the foundation pit, and its side surface is in contact with and abuts against the inner surface of the wall.

[0025] Both ends of the bearing beam are detachably arranged on the upper surfaces of the two support platforms, and the end faces at both ends are respectively detachably connected to the two support platforms.

[0026] The plurality of half sleeves all adopt a rectangular body structure, and a groove adapted to the pipeline is provided on one side, and the groove is adapted to the pipeline.

[0027] When the bearing beam suspends the pipeline, the plurality of half sleeves arranged under the pipeline are respectively detachably connected to the bearing beam through four connecting rods.

[0028] In some embodiments, two perforation grooves are respectively provided on the end faces on both sides of the groove of the half sleeve, and the perforation grooves are opened in the vertical direction.

[0029] The bearing beam is provided with a plurality of through groove groups arranged at intervals in sequence along the extending direction of the bearing beam. Each through groove group includes four through grooves. The four through grooves penetrate the bearing beam in the vertical direction, and the four through grooves are opened in a direction perpendicular to the extending direction of the bearing beam. The plurality of connecting rods can all pass through the through grooves in the vertical direction, and one end is detachably connected to the bearing beam, and the other end passes through the perforation groove and is detachably connected to the half sleeve.

[0030] When the bearing beam suspends the pipeline, the four through grooves in the plurality of through groove groups are all installed with connecting rods, and the through groove groups installed with connecting rods are arranged at intervals in sequence. The four connecting rods installed in the same through groove group are respectively detachably connected to the half sleeve directly below the through groove group.

[0031] In some embodiments, external threads are provided at both ends of the connecting rod. The two ends of the connecting rod respectively pass through the bearing beam and the half sleeve and are connected to nuts. Gaskets spanning the through grooves are provided between the nut and the surface of the bearing beam and between the nut and the lower surface of the half sleeve.

[0032] In some embodiments, the system further includes two auxiliary load carriers. Each auxiliary load carrier includes two insertion beams, two vertical beams, and a connecting beam. Two symmetrically arranged insertion slots are provided on the inclined surface of the triangular support. The two insertion slots are opened in a direction perpendicular to the foundation pit wall. The two auxiliary load carriers are respectively detachably connected to the triangular support, and the two insertion beams of the same auxiliary load carrier are respectively inserted into the two insertion slots in a direction perpendicular to the wall. A vertical beam is provided on the upper surface of the end of the insertion beam away from the insertion slot. A connecting beam is provided between the two vertical beams. When the auxiliary load carrier is installed on the bearing beam, the lower surface of the connecting beam abuts against and fits with the upper surface of the bearing beam, and the two insertion beams are inserted into the inclined surface of the support platform.

[0033] In some embodiments, cushion beams with a concave-shaped structure are provided on the upper surfaces of the two insertion beams. Both ends of the two cushion beams are respectively arranged on the upper surfaces of the two insertion beams. Removable connecting rods are provided between the half sleeves arranged on the outer walls of the upper pipelines and the two cushion beams. The half sleeves arranged on the outer walls of the lower pipelines are connected by steel ropes to the half sleeves vertically above them.

[0034] Compared with the prior art, the advantages of the present invention are as follows:

[0035] By arranging two triangular supports opposite to each other and abutting against the wall, and at the same time, by arranging two connecting plates and hydraulic push rods opposite to each other and tightly pressing the bearing beam, an interlocking force-bearing relationship is formed among the bearing beam, the two triangular supports, and the two connecting plates, so that the position of the bearing beam is stable. At the same time, the triangular supports are arranged on the lower surface of the support platform at one end of the foundation pit opening and are attached to and abut against the wall, so that while the cantilever of the bearing beam is reduced, the wall is supported to a certain extent, and thus the overall structure of the system is stable.

[0036] At the same time, the secondary load-bearing frame and the support platform share the acting force received by the bearing beam when suspending the pipeline, and the secondary load-bearing frame, the support platform, and the bearing beam are mutually limited and interlocked, so that the structure of the system is stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0038] Figure 1 Schematic diagram of the underground pipeline protection system for crossing an open-cut station foundation pit of the present application when suspending two pipelines;

[0039] Figure 2 For the embodiments of the present application Figure 1 Top view

[0040] Figure 3 Schematic diagram of the underground pipeline protection system for crossing an open-cut station foundation pit of the present application when suspending a single pipeline;

[0041] Figure 4 For the embodiments of the present application Figure 3 Top view;

[0042] Figure 5 Schematic diagram of the cross-section of the support platform and the connecting plate of the present pipeline protection system after connection and a partial cross-section of the triangular support;

[0043] Figure 6 Side view schematic diagram of the support platform of this pipeline protection system;

[0044] Figure 7 Side view schematic diagram of the connecting plate of this pipeline protection system;

[0045] Figure 8 Side view schematic diagram of the bearing beam of this pipeline protection system;

[0046] Figure 9 Cross-sectional view schematic diagram of the half sleeve arranged on the outer wall of the upper pipeline of this pipeline protection system;

[0047] Figure 10 Top view schematic diagram of the half sleeve arranged on the outer wall of the upper pipeline of this pipeline protection system;

[0048] Figure 11 Bottom view schematic diagram of the half sleeve arranged on the outer wall of the upper pipeline of this pipeline protection system;

[0049] Figure 12 Cross-sectional view schematic diagram of the half sleeve arranged on the outer wall of the lower pipeline of this pipeline protection system;

[0050] Figure 13 Top view schematic diagram when the cushion beam of this pipeline protection system is installed on the secondary load frame;

[0051] Figure 14 Side view schematic diagram of the secondary load frame of this pipeline protection system;

[0052] Figure 15 is Figure 1 Enlarged schematic diagram of reference numeral A in

[0053] Reference numerals:

[0054] 1 - Bearing beam, 11 - Through slot group, 111 - Through slot,

[0055] 2 - Support platform, 21 - Triangular support, 211 - Slot, 22 - Beam slot,

[0056] 3 - Connecting rod,

[0057] 4 - Half sleeve, 41 - Groove, 42 - Perforated slot, 43 - Rope slot, 44 - Hook,

[0058] 5 - Pipeline,

[0059] 6 - Nut,

[0060] 7 - Cushion block,

[0061] 8 - Secondary load frame, 81 - Inserted beam, 82 - Vertical beam, 83 - Connecting beam,

[0062] 9 - Bearing beam, 91 - Rectangular groove,

[0063] 10 - Steel rope,

[0064] 20 - Connecting plate, 201 - Support plate,

[0065] 30 - Hydraulic push rod, 301 - Tightening plate,

[0066] 40 - Bolt hole,

[0067] 50 - Bolt. Detailed implementation mode

[0068] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0069] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0070] In the description of the present invention, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0071] In addition, if terms such as "first", "second", "third", etc. are used only for distinguishing descriptions, they cannot be understood as indicating or implying relative importance.

[0072] In addition, if terms such as "horizontal", "vertical", "hanging" are used, it does not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0073] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, terms such as "set", "installed", "connected", "linked" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0074] It should be noted that, without conflict, the features in the embodiments of the present invention can be combined with each other.

[0075] It should be understood that when excavating a foundation pit, if the span of the foundation pit is relatively long, a relatively long bearing beam is required to span across the foundation pit. As a result, when the bearing beam is used to suspend pipelines, the cantilever of the beam body far from the side walls of the foundation pit is relatively long. Consequently, the farther the beam body of the bearing beam is from the wall of the foundation pit, the greater the moment it receives, which may cause the beam body of the bearing beam to be bent and deformed, leading to unstable suspension of the pipeline and potential safety hazards.

[0076] If there are other pipelines vertically below the pipeline, the bearing beam is required to suspend the two pipelines. In the prior art, by arranging multiple suspension structures such as steel wires, cables or steel bars at intervals on the bearing beam to suspend the two pipelines respectively, the bearing beam is subjected to a relatively large acting force and is prone to bending deformation or damage.

[0077] To improve the above problems, this embodiment provides a construction method for protecting underground pipelines across an open-cut station foundation pit, which mainly includes the following steps:

[0078] Step 1: According to the construction design drawings, conduct a survey of the construction site and formulate a foundation pit excavation plan.

[0079] Step 2: According to the results of the on-site survey, confirm the pipeline distribution and types, formulate a pipeline protection plan, and divide the pipeline protection measures into in-situ suspension protection and relocation protection.

[0080] Step 3: Excavate the foundation pit according to the excavation plan until the pipelines are completely exposed.

[0081] Step 4: Install the suspension structure. Support platforms are respectively arranged on the two side walls of the pit opening on the upper side of the foundation pit. The lower surface at one end of the support platform extends downward to form a right-angled triangle structure of a triangular support, and it is arranged inside the wall. One inner wall of the triangular support abuts and fits against the inner side wall of the foundation pit. The two support platforms are arranged oppositely, and the side surface of the triangular support abuts against the inner surface of the wall.

[0082] Lift and install the bearing beam onto the two support platforms, and the two end faces are respectively detachably connected to the two support platforms.

[0083] Step Five: Arrange multiple half sleeves on the lower side of the pipeline, with the inner sidewall of the half sleeve abutting against the outer wall of the pipeline. The half sleeve surrounds the lower half wall of the pipeline, and both end faces of the half sleeve facing the bearing beam are connected to the bearing beam through connecting rods.

[0084] Step Six: Continue to dig the foundation pit.

[0085] Preferably, in Step Two, it is necessary to confirm whether there is a pipeline on the vertical lower side of the pipeline, and formulate a pipeline suspension protection plan according to the survey results.

[0086] Preferably, in Step Four, if it is confirmed in Step Two that there is no pipeline on the lower side of the pipeline, then install the support platform and the bearing beam according to the method in Step Four.

[0087] If there is still one pipeline in Step Two, then according to the method in Step Four, first install the support platforms on both sides, and then install sub-load frames on the inclined surfaces of the triangular supports of the support platforms on both sides, and the two sub-load frames are arranged oppositely.

[0088] Preferably, in Step Six, if the sub-load frame is installed in Step Four, then continue to dig the foundation pit until the pipeline on the displacement lower side is completely exposed, and then arrange multiple spaced half sleeves on its lower side.

[0089] The half sleeves at both ends of the upper pipeline are respectively connected to the two sub-load frames through steel ropes, and the multiple half sleeves of the lower pipeline are connected to the multiple half sleeves of its upper pipeline through steel ropes.

[0090] Continue to dig the foundation pit.

[0091] Preferably, in Step Six, when there are two pipelines, the lower side of the half sleeve in the middle of the upper pipeline is not connected to the half sleeve of the lower pipeline.

[0092] A pipeline 5 protection system, as Figure 1 shown, includes a bearing beam 1, two support platforms 2, multiple connecting rods 3 and multiple half sleeves 4.

[0093] Among them, the bearing beam 1 adopts a rectangular structure and is arranged perpendicular to the walls on both sides of the foundation pit.

[0094] In this embodiment, as Figures 1-4 shown, the two support platforms 2 are arranged oppositely on both sides of the foundation pit, and the lower surface is in contact with the ground on the upper side of the foundation pit. Among them, the support platform 2 adopts a rectangular structure and is arranged on the ground on the upper side of the foundation pit. One end of the support platform 2 is placed at an interval of 1 m - 2 m from the edge of the wall of the foundation pit, and the other end extends out of the edge of the wall of the foundation pit and is located above the pit mouth of the foundation pit. The two support platforms 2 are arranged oppositely, and the lower surface of the support platform 2 is in contact with the ground on the upper side of the foundation pit.

[0095] In this embodiment, as Figures 1-6 shown, a beam groove 22 is provided on the upper surface of the support platform 2. The beam groove 22 is opened along the extension direction of the midline of the upper surface of the support platform 2 and is perpendicular to the walls on both sides of the foundation pit. The notch on one side of the beam groove 22 is arranged at the end face of one end of the support platform 2 located above the foundation pit opening. In this embodiment, the beam groove 22 is adapted to the bearing beam 1, so that the bearing beam 1 can be stably placed in the beam groove 22. When suspending the pipeline 5, one end of the support platform 2 is arranged on the inner wall of the wall at the foundation pit opening, so that the beam body of the bearing beam 1 at this position is supported and prevented from being suspended. Thus, the cantilever length of the bearing beam 1 is reduced, and further the external actions such as the moment received by the bearing beam 1 are reduced. Furthermore, the bearing beam 1 can suspend the pipeline 5 with a larger mass and can suspend the pipeline 5 above the foundation pit with a larger span.

[0096] In this embodiment, as Figures 1-6 shown, a triangular support 21 is provided on the lower surface of one end of the support platform 2. Specifically, the cross-section of the triangular support 21 along the vertical direction adopts a right-angled triangle structure, and the plane of one of the right-angled sides abuts and fits against the side wall of the foundation pit, and the plane of the triangular support 21 where the other right-angled side is located coincides with the lower surface of the support platform 2, and its inclined surface is inclined towards the bottom of the foundation pit. Among them, the inclined surface of the triangular support 21 intersects with the end face of the support platform 2 located above the foundation pit opening at the lower side edge of this end face.

[0097] In this embodiment, as Figures 1-7 shown, a slidable connecting plate 20 is provided in the beam groove 22 on the upper side of the support platform 2. The bottom of the connecting plate 20 is attached to the support platform 2. One end of the support platform 2 is provided with a hydraulic push rod 30, and a pressing plate 301 is provided at one end of the hydraulic push rod 30. The side of the connecting plate 20 facing away from the foundation pit is fixedly connected to the pressing plate 301, so that the hydraulic push rod 30 can push the pressing plate 301 to reciprocate along the beam groove 22, and then abut against the end face of the bearing beam 1. Thus, the bearing beam 1 is tightened by the connecting plates 20 at both ends of the bearing beam 1, and further the position of the bearing beam 1 is stabilized.

[0098] Among them, a plurality of bolt holes 40 are provided at one end of the bearing beam 1 and the connecting plate 20, so that the bearing beam 1 and the connecting plate 20 are bolted and connected by bolts 50, and further the connection between the bearing beam 1 and the connecting plate 20 is stabilized.

[0099] In this embodiment, as Figure 5 and Figure 7As shown in the figure, support plates 201 are provided on both sides of the side surface of the connecting plate 20 facing the hydraulic push rod 30, and the support plates 201 are in a right triangle structure. Among them, the two support plates 201 are arranged oppositely. The pressing plate 301 at one end of the hydraulic push rod 30 and the bolt holes 40 on the connecting plate 20 are both arranged between the two support plates 201. One right plane is attached to and fixedly connected to the side surface of the connecting plate 20, and the other right plane is attached to the bottom wall of the beam groove 22, so that the connecting plate 20 is stable, and further the support of the bearing beam 1 is stable.

[0100] In this embodiment, two triangular supports 21 are arranged oppositely and abutted against the wall. At the same time, through the relative arrangement of the two connecting plates 20 and the hydraulic push rod 30 and the pressing of the bearing beam 1, an interlocking force-bearing relationship is formed among the bearing beam 1, the two triangular supports 21, and the two connecting plates 20. Furthermore, the position of the bearing beam 1 is stable. At the same time, the triangular support 21 is arranged on the lower surface of the support platform 2 at one end of the foundation pit opening and is attached to and abutted against the wall. Thus, while the cantilever of the bearing beam 1 is reduced, the wall is supported to a certain extent, and further the overall structure of the system is stable.

[0101] In this embodiment, as Figures 9-11 shown, multiple half sleeves 4 are all in a rectangular body structure, and a groove 41 adapted to the pipeline 5 is provided on one side. The groove 41 is adapted to the pipeline 5, and the upper and lower side walls of the half sleeve 4 are parallel to the upper and lower surfaces of the bearing beam 1.

[0102] In this embodiment, when the bearing beam 1 suspends the pipeline 5, multiple half sleeves 4 arranged on the lower side of the pipeline 5 are respectively detachably connected to the bearing beam 1 through four connecting rods 3. Specifically, perforation grooves 42 adapted to the connecting rods 3 are respectively provided on the end faces on both sides of the groove 41 of the half sleeve 4. The perforation grooves 42 are opened in the vertical direction. The bearing beam 1 is provided with multiple through groove groups 11 arranged at intervals in sequence along the extending direction of the bearing beam 1. The through groove group 11 includes four through grooves 111. The four through grooves 111 penetrate the bearing beam 1 in the vertical direction, and the four through grooves 111 are opened in the direction perpendicular to the extending direction of the bearing beam 1. Multiple connecting rods 3 can all penetrate through the through grooves 111 in the vertical direction, and one end is detachably connected to the bearing beam 1, and the other end penetrates through the perforation groove 42 and is detachably connected to the half sleeve 4. Among them, when the bearing beam 1 suspends the pipeline 5, the four through grooves 111 in multiple through groove groups 11 are all installed with connecting rods 3, and the multiple through groove groups 11 installed with connecting rods 3 are arranged at intervals in sequence. The four connecting rods 3 installed in the same through groove group 11 are respectively detachably connected to the half sleeve 4 directly below the through groove group 11. Among them, according to the length of the pipeline 5 and the number of through groove groups 11 on the bearing beam 1 and other situations, different through groove groups 11 at different intervals can be selected to install the connecting rods 3, so as to ensure the stable suspension of the pipeline 5.

[0103] In this embodiment, external threads are provided at both ends of the connecting rod 3. The two ends of the connecting rod 3 pass through the bearing beam 1 and the half sleeve 4 respectively and are connected to the nuts 6, so that the disassembly and installation of the connecting rod 3 are relatively simple. At the same time, the through groove 111 is opened along the extending direction perpendicular to the bearing beam 1. Furthermore, the connecting rod 3 can be displaced along the opening direction in the through groove 111, so as to suspend pipelines 5 of different sizes. As a result, the bearing beam 1 has a wide range of applications. Among them, for pipelines of different sizes, only the half sleeve 4 with different sizes needs to be replaced.

[0104] In this embodiment, cushion blocks 7 spanning the through groove 111 are provided between the nut 6 and the upper surface of the bearing beam 1 and between the nut 6 and the lower surface of the half sleeve 4. Among them, the cushion block 7 adopts a concave structure. The opening of the cushion block 7 provided on the upper surface of the bearing beam 1 faces away from the upper surface of the bearing beam 1, and the lower surface is in contact with the upper surface of the bearing beam 1. The opening of the cushion block 7 provided on the lower surface of the half sleeve 4 faces away from the lower surface of the half sleeve 4, and the lower surface is in contact with the lower surface of the half sleeve 4. The cushion block 7 is provided with a perforation adapted to the connecting rod 3, so that the connecting rod 3 can pass through the through groove 111 through the perforation.

[0105] Among them, the perforation is provided at the center of the bottom wall of the cushion block 7, so that the vertical side walls on both sides of the cushion block 7 are evenly stressed, and thus the connection of the connecting rod 3 is relatively stable. In this example, the vertical side walls on both sides of the cushion block 7 are perpendicular to the extending direction of the bearing beam 1.

[0106] In some embodiments, the system further includes two secondary load carriers 8. The secondary load carrier 8 includes two insertion beams 81, two vertical beams 82 and a connecting beam 83. Two symmetrically arranged slots 211 are provided on the inclined surface of the triangular support 21. The two slots 211 are opened along the direction perpendicular to the foundation pit wall, and the heights of the slots 211 of the same triangular support 21 are the same. The two secondary load carriers 8 are detachably connected to the triangular support 21 respectively, and the two insertion beams 81 of the same secondary load carrier 8 are inserted into the two insertion slots along the direction perpendicular to the wall respectively. Among them, the two slots 211 of one triangular support 21 are symmetric with respect to the center line of the bearing beam 1 with the two slots 211 of the other triangular support 21.

[0107] In this embodiment, insertion beams 81 are provided in the slots 211, and the slots 211 are adapted to the insertion beams 81, so that the insertion beams 81 are relatively stable when inserted. Among them, the insertion beam 81 adopts a rectangular body structure.

[0108] In this embodiment, vertical beams 82 are provided on the upper surfaces of the ends of the two insertion beams 81 that are far from the slots 211. Among them, the vertical beams 82 are perpendicular to the insertion beams 81, and two opposite circumferential side walls of the vertical beams 82 are respectively parallel to two opposite circumferential side walls of the insertion beams 81, and the other two opposite circumferential side walls of the vertical beams 82 are respectively parallel to the side walls at the two opposite ends of the insertion beams 81. A connecting beam 83 is provided between the two vertical beams 82. The two ends of the connecting beam 83 are respectively perpendicular to the opposite side surfaces of the two vertical beams 82. In this embodiment, when the secondary load carrier 8 is installed on the load-bearing beam 1, the lower surface of the connecting beam 83 abuts and fits against the upper surface of the load-bearing beam 1. The two insertion beams 81 are inserted into the inclined surfaces of the support platform 2. Among them, the connecting beam 83, the vertical beams 82, and the insertion beams 81 all adopt rectangular body structures, and the lower surface of the connecting beam 83, the upper surface of the insertion beam 81, and the upper surface of the load-bearing beam 1 are all parallel to each other. Thus, the two ends of the load-bearing beam 1 are longitudinally limited and acted upon by the two connecting beams 83. At the same time, the secondary load carrier 8 and the triangular support 21 and the load-bearing beam 1 are interlocked and limited to each other, so that this structure is relatively stable.

[0109] Among them, when using the secondary load carrier 8, it can be determined according to the weight of the pipeline 5 and the number of pipelines 5, so as to avoid the load-bearing beam 1 from being subjected to a large acting force.

[0110] In this example, two cushion beams 9 with a concave structure are provided on the upper surfaces of the two insertion beams 81. The two ends of the two cushion beams 9 are respectively arranged on the upper surfaces of the two insertion beams 81. Specifically, the two cushion beams 9 are both laid along the direction perpendicular to the extending direction of the load-bearing beam 1, and the lower surface abuts and fits against the upper surface of the insertion beam 81. Among them, the insertion beam 81 and the cushion beam 9 are fixedly connected.

[0111] Among them, a rectangular groove 91 penetrating the bottom wall is provided on the bottom wall of the cushion beam 9 and is adapted to the connecting rod 3. Specifically, the two opposite vertical side walls of the cushion beam 9 are symmetric with respect to the rectangular groove 91. The two connecting rods 3 can be vertically inserted into the same rectangular groove 91 and are respectively inserted into two opposite perforated grooves 42 on the end faces on both sides of the groove 41 of the half sleeve 4, so as to be connected to the nut 6. Thus, while suspending the lower pipeline 5, the insertion beam 81 can also share part of the acting force of the load-bearing beam 1 for suspending the pipeline 5, thereby reducing the acting force on the load-bearing beam 1 and avoiding the load-bearing beam 1 from being bent or damaged.

[0112] In this embodiment, when the pipeline 5 is heavy or there is still a pipeline 5 under the pipeline 5, after making a suspension plan according to the actual situation such as the force condition and the length of the pipeline 5, the load-bearing beam 1, the connecting rod 3, and the half sleeve 4 are used to suspend the upper pipeline 5. Among them, the suspension positions and intervals of the multiple connecting rods 3 can be set according to the length of the used pipeline 5 and the suspension plan, so as to keep the pipeline 5 stable.

[0113] In this embodiment, a detachable connecting rod 3 is provided between the half sleeve 4 arranged on the outer wall of the upper pipeline 5 and each of the two cushion beams 9. The half sleeve 4 arranged on the outer wall of the lower pipeline 5 is connected to the half sleeve 4 vertically above it by a steel rope 10. Specifically, after the upper pipeline 5 is suspended, the bearing beam 1, the steel wire rope and the half sleeve 4 are used to suspend the lower pipeline 5. Among them, the outer circumferential wall of the half sleeve 4 arranged on the outer wall of the lower pipeline 5 adopts an arc structure, and circumferential rope grooves 43 are provided at both ends of the outer wall. The two rope grooves 43 are arranged oppositely, and the extending direction thereof is consistent with the extending direction of the outer circumferential wall of the half sleeve 4 arranged on the outer wall of the lower pipeline 5, so that the steel rope 10 can fit with the lower half sleeve 4 along the rope groove 43, and further make the suspension of the lower pipeline 5 relatively stable.

[0114] Among them, the half sleeve 4 arranged on the lower pipeline 5 is not provided with a perforation groove 42 and a hook 44.

[0115] Among them, hooks 44 are respectively provided at the four corners of the lower surface of the upper half sleeve 4, and the distance between the two hooks 44 along the direction perpendicular to the extending direction of the bearing beam 1 is greater than the diameter of the upper pipeline 5. Furthermore, when the lower pipeline 5 is suspended by the steel rope 10, it is avoided that the diameter of the lower pipeline 5 is smaller than that of the upper pipeline 5, and when the connecting rod 3 is used for suspension, the connecting rod 3 is blocked by the upper pipeline 5 and cannot be suspended.

[0116] Among them, the connection mode between the steel rope 10 and the upper half sleeve 4 can adopt connection structures such as hooks 44, eye rings, buckles or wire rope clips, etc., which all belong to the prior art and will not be elaborated here.

[0117] In this embodiment, when suspension is carried out, first, according to factors such as the length, weight and quantity of the pipeline 5, a suspension plan is formulated. If there is only one pipeline 5, after installing the support platform 2 and the bearing beam 1, then install a plurality of connecting rods 3 to the bearing beam 1 and arrange them at intervals according to the suspension plan. Then, arrange a plurality of half sleeves 4 with a rectangular body structure at intervals along the pipeline 5, and they are respectively located vertically below a plurality of connecting rods 3. Then, connect a plurality of connecting rods 3 to a plurality of half sleeves 4 respectively, so as to suspend the pipeline 5.

[0118] If there is another pipeline 5 below the pipeline 5, when installing the system according to the above process, first install the two auxiliary load carriers 8 to the triangular supports 21 respectively. At the same time, select different through slot groups 11 according to the formulated suspension plan for installing the connecting rods 3. Then, suspend the upper pipeline 5. After that, install the connecting rods 3 to the cushion beams 9 of the two auxiliary load carriers 8 respectively, and then suspend both ends of the upper pipeline 5. Finally, use the steel rope 10 and the half sleeve 4 with an arc-shaped outer wall to suspend the lower pipeline 5, so as to ensure the stable suspension of the lower pipeline 5.

[0119] Among them, when the lower pipeline 5 is suspended, an even number of half sleeves 4 can be used and symmetrically arranged at both ends of the center of the pipeline 5, so as to avoid increasing the acting force on the center of the bearing beam 1, thereby causing the bearing beam 1 to be subjected to a large moment, and then resulting in bending and damage.

Claims

1. A construction method for protecting underground pipelines in a cross-open cut station foundation pit, characterized in that: The following steps are involved: Step 1: Survey the construction site and formulate a foundation pit excavation plan according to the construction design drawings; Step 2: According to the on-site survey results, confirm the distribution and type of pipelines, formulate a pipeline protection plan, and divide the pipeline protection measures into in-situ suspension protection and relocation protection; Step 3: Dig the foundation pit according to the excavation plan until the pipeline is completely exposed; Step 4: Install the suspension structure. Set support platforms on the walls on both sides of the pit opening on the upper side of the foundation pit. The lower surface of one end of the support platform extends downward to form a triangular support of a right-angled triangle structure, and is set on the inner side of the wall. The inner wall of one side of the triangular support abuts against and fits with the inner wall of the foundation pit. The two support platforms are set opposite to each other, and the side surface of the triangular support abuts against the inner surface of the wall. The load-bearing beam is hoisted to two supporting platforms, and the end surfaces at both ends are detachably connected to the two supporting platforms respectively; Step 5: multiple half-tubes are arranged on the lower side of the pipeline, and the inner wall of the half-tube is against the outer wall of the pipeline, the half-tube surrounds the lower half wall of the pipeline, and the two end surfaces of the half-tube facing the load-bearing beam are connected to the load-bearing beam through connecting rods; Step 6: Continue to dig the foundation pit.

2. The pipeline protection construction method according to claim 1, characterized in that: In step 2, it is necessary to confirm whether there is a pipeline on the vertical lower side of the pipeline and formulate a pipeline suspension protection plan based on the survey structure.

3. According to claim 2, it is characterized in that: In step 4, if it is confirmed in step 2 that there is no pipeline below the pipeline, the support platform and the load-bearing beam are installed according to the method in step 4; If there is still one pipeline in step 2, then according to the method in step 4, first install the support platforms on both sides, and then install the auxiliary carriers on the inclined surfaces of the triangular supports of the support platforms on both sides, and the two auxiliary carriers are arranged opposite to each other.

4. The method according to claim 3, characterized in that: In step 6, if the auxiliary carrier is installed in step 4, the foundation pit is continued to be excavated until the pipeline on the lower side of the displacement is completely exposed, and a plurality of half casings are arranged at intervals on the lower side thereof; The half-casings at both ends of the upper pipeline are respectively connected to the two auxiliary carriers through steel ropes, and the multiple half-casings at the lower pipeline are connected to the multiple half-casings of the upper pipeline through steel ropes; Continue digging the foundation pit.

5. The method according to claim 4, characterized in that: In step six, when there are two pipelines, the lower side of the half-sleeve in the middle of the upper pipeline is not connected to the half-sleeve of the lower pipeline.

6. A pipeline protection system, characterized in that: It comprises a bearing beam (1), two supporting platforms (2), a plurality of connecting rods (3) and a plurality of half sleeves (4), wherein the two supporting platforms (2) are arranged on both sides of a foundation pit in a relative manner, and the lower surfaces thereof are in contact with the ground surface above the foundation pit, and a triangular support (21) is provided on the lower surface of one end of the supporting platform (2), the inclined surface of the triangular support (21) is inclined toward the bottom of the foundation pit, and the side surface thereof is in contact with and abuts against the inner surface of the wall; The upper surfaces of two support platforms (2) are detachably provided at both ends of the load-bearing beam (1), and the end surfaces at both ends are detachably connected to the two support platforms (2); The plurality of half-tubes (4) all adopt a rectangular structure, and one side is provided with a groove (41) adapted to the pipeline (5), and the groove (41) is adapted to the pipeline (5); When the load-bearing beam (1) suspends the pipeline (5), the plurality of half-tubes (4) arranged on the lower side of the pipeline (5) are detachably connected to the load-bearing beam (1) via the four connecting rods (3).

7. The pipeline protection system according to claim 6, characterized in that: The end surfaces on both sides of the groove (41) of the half sleeve (4) are respectively provided with two perforated grooves (42), and the perforated grooves (42) are opened in the vertical direction; The load-bearing beam (1) is provided with a plurality of through slot groups (11) arranged in sequence and at intervals along the extension direction of the load-bearing beam (1), the through slot group (11) comprising four through slots (111), the four through slots (111) passing through the load-bearing beam (1) in a vertical direction, and the four through slots (111) are opened in a direction perpendicular to the extension direction of the load-bearing beam (1), the plurality of connecting rods (3) can pass through the through slots (111) in a vertical direction, and one end is detachably connected to the load-bearing beam (1), and the other end passes through the perforated slot (42) and is detachably connected to the half sleeve (4); When the load-bearing beam (1) suspends a pipeline (5), the four through slots (111) in the plurality of through slot groups (11) are all installed with connecting rods (3), and the plurality of through slot groups (11) installed with connecting rods (3) are sequentially spaced apart, and the four connecting rods (3) installed in the same through slot group (11) are respectively detachably connected to the half sleeves (4) vertically below the through slot group (11).

8. The pipeline protection system according to claim 7, characterized in that: Both ends of the connecting rod (3) are provided with external threads. Both ends of the connecting rod (3) pass through the load-bearing beam (1) and the half sleeve (4) respectively and are connected to the nut (6). A cushion block (7) spanning the through groove group (111) is provided between the nut (6) and the surface of the load-bearing beam (1) and between the nut (6) and the lower surface of the half sleeve (4).

9. The method according to claim 9, characterized in that: The system further comprises two auxiliary carriers (8), wherein the auxiliary carriers (8) comprise two insertion beams (81), two vertical beams (82) and a connecting beam (83); the inclined surface of the triangular support (21) is provided with two symmetrically arranged slots (211); the two slots (211) are opened in a direction perpendicular to the foundation pit wall; the two auxiliary carriers (8) are respectively detachably connected to the triangular support (21); and the two insertion beams (81) of the same auxiliary carrier (8) are respectively inserted into the two insertion slots (211) in a direction perpendicular to the wall; the upper surface of the insertion beam (81) away from the slot (211) is provided with a vertical beam (82); a connecting beam (83) is provided between the two vertical beams (82); when the auxiliary carrier (8) is mounted on the load-bearing beam (1), the lower surface of the connecting beam (83) abuts against and fits the upper surface of the load-bearing beam (1); and the two insertion beams (81) are inserted into the inclined surface of the support platform (2).

10. The method according to claim 9, characterized in that: Two concave-shaped cushion beams (9) are provided on the upper surfaces of the two inserted beams (81), and both ends of the two cushion beams (9) are respectively arranged on the upper surfaces of the two inserted beams (81). A detachable connecting rod (3) is provided between the half-sleeve (4) arranged on the outer wall of the upper pipeline (5) and the two cushion beams (9), and the half-sleeve (4) arranged on the outer wall of the lower pipeline (5) is connected to the half-sleeve (4) located vertically above it by a steel rope (10).

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