Open excavation construction method for municipal pipe network

Abstract

The invention discloses an open excavation construction method for a municipal pipe network. The open excavation construction method comprises the following steps that a pushing supporting box and a soil retaining supporting box are prepared; excavating a first section of groove, and meanwhile, gradually pushing a pushing support box for supporting and installing a first section of pipeline; the pushing supporting box is started for jacking, meanwhile, the excavation area continues to be excavated, and after the jacking length of the pushing supporting box meets the requirement, a soil retaining supporting box is installed behind the pushing supporting box for supporting; and backfilling the groove within the range of the soil retaining support box, continuously jacking the pushing support box, and continuously excavating the excavation area in front of the pushing support box, so that the backfilling of the soil retaining support box, the jacking of the pushing support box, the excavation of the groove and the installation of the pipeline form repeated line production. According to the method, repeated line production of backfilling of the soil retaining supporting box, jacking of the jacking supporting box, excavation of the groove and installation of the pipeline can be achieved, so that the construction period and the construction efficiency are guaranteed, the construction cost is effectively reduced, meanwhile, the construction safety is high, and the backfilling construction quality is good.

Description

Technical Field

[0001] The invention relates to the technical field of trench excavation and support, pipeline installation and backfilling construction, and in particular to an open excavation construction method for a municipal pipe network. Background Art

[0002] As various regions continue to accelerate the transformation of underground pipeline networks, various new technologies and new methods are widely used, driving the continuous upgrading of underground pipeline network transformation technology and further expanding the market scale. The commonly used methods for municipal pipeline construction include pipe jacking and open excavation. However, the transformation of municipal pipelines in cities is restricted by many reasons. Since pipeline construction is mostly located in urban villages, old urban areas and urban-rural fringe areas, the construction site is small, the existing municipal pipelines are intricate and the traffic environment is complex. In addition, urban pipeline transformation usually has a small pipe diameter and shallow soil cover. Therefore, the cost of using pipe jacking is much higher than that of open excavation. In the process of trench excavation for pipeline construction, it is increasingly affected by traffic, construction sites and existing pipelines, which leads to limited excavation sites for foundation pits, untimely foundation pit support leading to pipeline damage and high construction safety risks.

[0003] Usually, trench excavation using the slope method requires a sufficiently large construction site, which also increases the amount of excavation and backfilling work; or the use of steel sheet pile support is prone to conflict with existing pipelines, increasing the amount of pipeline protection and relocation work; when conventional support boxes are used instead of steel sheet pile support, workers are required to go down the well to work, the construction space is narrow, and the up and down cross-operation increases safety risks, and it is impossible to form a continuous operation with the trench backfill, and the construction period is long.

[0004] Therefore, seeking a support box suitable for open excavation of municipal pipeline networks has become a common topic in the industry. Summary of the invention

[0005] The present invention provides an open excavation construction method for a municipal pipe network, so as to solve the technical problems existing in the existing construction method, such as high construction safety risk, inability to form continuous operation resulting in long construction period and low construction efficiency.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A method for open excavation construction of a municipal pipe network comprises the following steps: preparation of a support box group: preparing a push support box and a retaining support box with adjustable width, and making the prepared push support box also capable of being used for pipe installation support and retaining support box push-up, and making the prepared retaining support box capable of backfilling earthwork; excavation of the first trench section: excavating the first trench section in the excavation area, and gradually pushing in the push support box during the excavation process to support and install the first section of the pipe; excavation and support: after the first trench section is excavated to the designed elevation and the push support box is lowered, After the placement and installation of the pipeline are completed, start the jacking of the jacking support box, and at the same time continue to excavate the excavation area in front of the jacking support box. After the jacking length of the jacking support box meets the required distance for the installation of the retaining support box, install the retaining support box support behind the jacking support box; installation, backfilling and excavation are repeated: backfill the trench within the range of the retaining support box, continue to jack the jacking support box, and continue to excavate the excavation area in front of the jacking support box, so that the retaining support box backfilling, jacking of the jacking support box, trench excavation and pipeline installation form a repetitive flow operation.

[0008] Furthermore, the jacking support box includes two first support plates arranged opposite to each other along the width direction of the groove, a first transverse support arranged on the inner side wall of one of the first support plates, pipe supports arranged on the inner side walls of the two first support plates and opposite to each other, and a jacking cylinder arranged on the inner side wall of at least one of the first support plates; the first transverse support is telescopically arranged along the width direction of the groove to tighten the two first support plates relative to the two groove walls; the pipe supports are telescopically arranged along the width direction of the groove to cooperate with another set of corresponding pipe supports to relatively clamp and fix the pipes; the jacking cylinder is telescopically arranged along the longitudinal extension of the groove to tighten the retaining support box located at the rear.

[0009] Furthermore, the inner side walls of the two first supporting plates are also correspondingly provided with first slide grooves extending along the depth direction of the groove; the first lateral support includes a first inner support and a first outer support which are arranged in an inner and outer manner, a support jack located in the first outer support and tightened between the inner end surface of the first outer support and the outer end surface of the first inner support, and a first support slider fixedly connected to the end of the first outer support; the first support slider is slidably connected to the first slide groove on the first first supporting plate and fixed by a fastener; the first inner support is used to extend relative to the first outer support under the action of the support jack and press against the first slide groove on the second first supporting plate.

[0010] Furthermore, the inner walls of the two first support plates are correspondingly provided with slideways extending along the depth direction of the groove, and both ends of the slideways are respectively provided with adjustment jacks that can be extended and retracted along the extension direction of the slideways; the ends of the pipe supports are slidably connected to the corresponding slideways and are located between the upper and lower groups of adjustment jacks.

[0011] Furthermore, the pipeline support includes a support slider slidably connected to the slideway, a first section support and a second section support axially sleeved, a rotating member rotatably connected to the extended end of the second section support, and a clamping block connected to the rotating member; the end of the first section support is fixedly connected to the support slider.

[0012] Furthermore, the retaining support box includes three second support plates for forming the three surfaces of the square box body, and a second transverse support arranged on the inner wall of one of the second support plates in the width direction of the groove; the second transverse support is telescopically arranged along the width direction of the groove to be used to relatively tighten the retaining support box along the width direction of the groove.

[0013] Furthermore, the second supporting plate includes a second heightened section and a second standard section arranged in a plate shape, and a second connecting piece that serves as a connection; the second heightened section and the second standard section are arranged in sequence up and down along the depth direction of the groove; the second connecting piece is arranged between the second heightened section and the second standard section to fix the two in a detachable manner; the inner side walls of the two second supporting plates in the width direction are also correspondingly provided with a second slide groove extending along the depth direction of the groove; the second lateral support includes a second inner support and a second outer support arranged in an inner and outer manner, a supporting jack located in the second outer support and tightened between the inner end face of the second outer support and the outer end face of the second inner support, and a second supporting slider fixedly connected to the end of the second outer support; the second supporting slider is slidably connected to the second slide groove on the first second supporting plate and fixed by a fastener; the second inner support is used to extend relative to the second outer support under the action of the supporting jack and press against the second slide groove on the second second supporting plate.

[0014] Furthermore, the specific operation of the step "preparation of support box group" is: according to the trench excavation size, depth and pipeline structure, determine the specifications of the top push support box and the retaining support box, and prepare the top push support box and the retaining support box after drawing the detailed component drawings; the specific operation of the step "first section trench excavation" is: according to the pipeline type, after determining the trench excavation width, carry out the first section of trench excavation in the excavation area, and the trench excavation is carried out in layers and sections. After the first layer is excavated, the top push support box is lowered, and then the excavation is carried out layer by layer in sequence to the design elevation, and the top push support box is pressed in batches, and finally the pipeline is hoisted into the top push support box for installation.

[0015] Furthermore, the step of "installation, backfilling and excavation repetition" specifically includes the following steps: backfilling the earth into the trench within the range of the retaining support box; when the backfilling of earth within the range of the retaining support box is completed, starting the jacking support box again to tighten the retaining support box to push forward, and at the same time excavating the trench in the excavation area at the front end of the jacking support box; when the jacking length again meets the required length for the installation of the retaining support box, lowering and installing the retaining support box; repeating the above steps in sequence, and when the jacking support box meets the installation distance of the next section of the pipeline, fix the pipeline into the jacking support box.

[0016] Furthermore, the step of "installation, backfilling and excavation repetition" specifically includes the following steps: starting the jacking support box to jack the retaining support box to push forward, and at the same time backfilling the earth into the trench within the range of the retaining support box, and excavating the trench in the excavation area at the front end of the jacking support box; when the jacking length meets the required length for the installation of the retaining support box again, lowering and installing the retaining support box; repeating the above steps in sequence, and when the jacking support box meets the installation distance of the next section of the pipeline, fix the pipeline into the jacking support box.

[0017] The present invention has the following beneficial effects:

[0018] When the construction method of the present invention is used for open excavation of a pipeline network, since the widths of the jacking support box and the retaining support box prepared in step S10 are both telescopically adjustable, when performing step S20, the width of the jacking support box can be adjusted so that during the excavation of the first section of the trench, the trench walls on both sides of the first section of the trench can be supported against the trench walls, thereby solving the support problem during the trench excavation process. When performing step S30, the width of the retaining support box can also be adjusted to support the trench walls of the trench excavated to the designed elevation. At the same time, the jacking support box prepared in step S10 can also be used for installation support of the pipeline to be installed, so as to position and support the pipeline in step S20 and improve the stability of the pipeline construction. At the same time, step S The pushing support box prepared in 10 can also be used for pushing the retaining support box. Therefore, when performing step S40, when the pushing support box is pressed against the retaining support box and pushed forward, the retaining support box can be pressed against the backfill layer 3 formed by the backfill groove behind it, so that the retaining support box can also be used to support the backfill layer 3 to improve the stability of the backfill; on the other hand, in step S40, the backfilling of the retaining support box, the pushing of the pushing support box, the excavation of the groove and the installation of the pipeline can form a repetitive flow operation, which not only ensures the construction period and construction efficiency, effectively reduces the construction cost, but also has high construction safety and good backfill construction quality. Therefore, the construction method of the present invention has strong versatility and good social benefits as well as good prospects for promotion and application.

[0019] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0021] Figure 1 It is a schematic diagram of the spatial structure of a jacking support box according to a preferred embodiment of the present invention;

[0022] Figure 2 yes Figure 1 Schematic diagram of the main structure;

[0023] Figure 3 yes Figure 1 A schematic diagram of a top view structure;

[0024] Figure 4 yes Figure 1 Schematic diagram of the structure viewed from above;

[0025] Figure 5 It is a schematic diagram of the spatial structure of the earth retaining support box of the preferred embodiment of the present invention;

[0026] Figure 6 yes Figure 5 A schematic diagram of the rear view and main view structure;

[0027] Figure 7 yes Figure 5 A schematic diagram of a top view structure;

[0028] Figure 8 yes Figure 5 Schematic diagram of the structure viewed from above;

[0029] Fig. 9 It is a top view schematic diagram of the construction steps of the open excavation construction method for a municipal pipe network according to a preferred embodiment of the present invention;

[0030] Fig.10 It is a cross-sectional schematic diagram of the construction steps of the open-cut construction method for a municipal pipe network according to a preferred embodiment of the present invention.

[0031] Legend:

[0032] 1. Push support box; 11. First heightening section; 12. First standard section; 13. First connecting piece;

[0033] 14. first lateral support; 141. first outer support; 142. first inner support; 143. first support slider;

[0034] 15. Pipe support; 151. First section support; 152. Second section support; 153. Rotating member; 154. Support slider; 155. Clamp;

[0035] 16. Push cylinder; 17. First slideway; 18. Slideway; 19. Adjusting jack;

[0036] 2. earth retaining support box; 21. second heightening section; 22. second standard section; 23. second connecting piece;

[0037] 24, second lateral support; 241, second outer support; 242, second inner support; 243, second support slider;

[0038] 25. Second chute; 26. Push support rib; 27. Axillary rib;

[0039] 3. Backfill layer; 4. Excavation area; 5. Pipeline; 6. Range extender. DETAILED DESCRIPTION

[0040] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0041] Reference Figure 1 , Figure 5 , Fig. 9 , Fig.10 The preferred embodiment of the present invention provides a method for open-cut construction of a municipal pipe network, comprising the following steps:

[0042] S10: Preparation of support box group: preparing a push support box 1 and a retaining support box 2 with adjustable width, and making the prepared push support box 1 also capable of being used for installation support of the pipeline 5 and push-pushing the retaining support box 2, and making the prepared retaining support box 2 capable of backfilling earth;

[0043] S20: excavation of the first trench: excavation of the first trench is carried out in the excavation area 4, and the top push support box 1 is gradually pushed in during the excavation process to support and install the first section of the pipeline 5;

[0044] S30: Excavation and support: After the first trench is excavated to the designed elevation, the jacking support box 1 is lowered, and the pipeline 5 is installed, the jacking support box 1 is started, and the excavation area 4 in front of the jacking support box 1 is continued to be excavated. After the jacking length of the jacking support box 1 meets the required distance for the installation of the retaining support box 2, the retaining support box 2 is installed behind the jacking support box 1;

[0045] S40: Repeat installation, backfilling and excavation: backfill the trench within the range of the retaining support box 2, continue to push the jacking support box 1, and continue to excavate the excavation area 4 in front of the jacking support box 1, so that the backfilling of the retaining support box 2, the jacking of the jacking support box 1, the trench excavation and the installation of the pipeline 5 form a repetitive flow operation.

[0046] When the construction method of the present invention is used for open excavation of the pipeline network, since the widths of the jacking support box 1 and the retaining support box 2 prepared in step S10 are both telescopically adjustable, when performing step S20, the width of the jacking support box 1 can be adjusted so that during the excavation of the first section of the trench, the trench walls on both sides of the first section of the trench can be supported against the trench walls, thereby solving the support problem during the trench excavation process. When performing step S30, the width of the retaining support box 2 can also be adjusted to support the trench walls of the trench excavated to the designed elevation. At the same time, the jacking support box 1 prepared in step S10 can also be used for the installation support of the pipeline 5 to be installed, so as to position and support the pipeline 5 in step S20, thereby improving the stability of the pipeline 5 construction. At the same time, the jacking support box 1 prepared in step S10 The pushing support box 1 can also be used for pushing the retaining support box 2. Therefore, when performing step S40, when the pushing support box 1 pushes against the retaining support box 2 and pushes forward, the retaining support box 2 can be pressed against the backfill layer 3 formed by the backfill groove behind it, so that the retaining support box 2 can also be used to support the backfill layer 3 to improve the stability of the backfill; on the other hand, in step S40, the backfilling of the retaining support box 2, the pushing of the pushing support box 1, the excavation of the groove and the installation of the pipeline 5 can form a repetitive flow operation, which not only ensures the construction period and construction efficiency, effectively reduces the construction cost, but also has high construction safety and good backfill construction quality. Therefore, the construction method of the present invention has simple construction steps, convenient and efficient construction, strong versatility and good social benefits as well as good prospects for promotion and application.

[0047] Alternatively, if Figure 1-4 As shown, the jacking support box 1 includes two first support plates arranged opposite to each other along the width direction of the groove, a first transverse support 14 arranged on the inner side wall of one of the first support plates, pipe support 15 arranged on the inner side walls of the two first support plates and arranged opposite to each other, and a jacking cylinder 16 arranged on the inner side wall of at least one of the first support plates. The first transverse support 14 is arranged to be telescopic along the width direction of the groove to be used to relatively tighten the two first support plates on the two groove walls. The pipe support 15 is arranged to be telescopic along the width direction of the groove to cooperate with another set of corresponding pipe support 15 to relatively clamp and fix the pipe 5. The jacking cylinder 16 is arranged to be telescopic along the longitudinal extension of the groove to be used to tighten the retaining support box 2 located at the rear. In this optional solution, the components of the jacking support box 1 are processed from formed steel components, so that the jacking support box 1 has high overall rigidity and good support stability.

[0048] In this option, if Figure 1As shown, the first support plate includes a first heightened section 11 and a first standard section 12 which are arranged in a plate shape, and a first connecting member 13 which serves as a connection. The first heightened section 11 and the first standard section 12 are arranged in sequence up and down along the depth direction of the groove. The first connecting member 13 is arranged between the first heightened section 11 and the first standard section 12 to fix the two detachably. In this optional scheme, the first connecting member 13 includes a connecting strip with an "H"-shaped cross-section, and a connecting bolt or a connecting screw which serves as a connection; the upper and lower long grooves of the connecting strip are respectively clamped at the bottom end of the first heightened section 11 and the top end of the first standard section 12; the connecting bolt or the connecting screw passes through the connecting strip and connects and fixes the first heightened section 11 and the first standard section 12 respectively.

[0049] In this option, if Figure 1 As shown, the inner side walls of the two first support plates are also provided with first slide grooves 17 extending along the groove depth direction. Figure 2 As shown, the first lateral support 14 includes a first inner support 142 and a first outer support 141 which are arranged in an inner and outer manner, a support jack located in the first outer support 141 and tightened between the inner end surface of the first outer support 141 and the outer end surface of the first inner support 142, and a first support slider 143 fixedly connected to the end of the first outer support 141. The first support slider 143 is slidably connected to the first slide groove 17 on the first first support plate and fixed by a fastener. The first inner support 142 is used to extend relative to the first outer support 141 under the action of the support jack and press against the first slide groove 17 on the second first support plate. In this optional solution, if Figure 1 As shown, the first slide groove 17 is configured as a concave component, which is welded to the first supporting plate and is used for fixing the first lateral support 14 and adjusting the up and down sliding movement, and at the same time serves as a rib for the first supporting plate; the first supporting slider 143 is configured as a mountain-shaped component, and the connecting support is used for the first slide groove 17 to slide up and down. After being adjusted into place, the fixed end is bolted to the first slide groove 17 on one side.

[0050] In this option, if Figure 1 As shown, the inner side walls of the two first support plates are also provided with slideways 18 extending in the depth direction of the groove, and both ends of the slideways 18 are also provided with adjustment jacks 19 that extend and retract along the extension direction of the slideways 18. The ends of the pipe support 15 are slidably connected to the corresponding slideways and are located between the upper and lower groups of adjustment jacks 19. In this optional solution, the slideways 18 are also used to add ribs to the first support plates; the two groups of adjustment jacks 19 are used to limit the upper and lower height positions of the pipe support 15 located in the slideways 18.

[0051] In this option, if Figure 2As shown, the pipeline support 15 includes a support slider 154 slidably connected to the slideway 18, a first section support 151 and a second section support 152 axially sleeved, a rotating member 153 rotatably connected to the extended end of the second-stage support, and a clamping block 155 connected to the rotating member 153. The end of the first section support 151 is fixedly connected to the support slider 154. In this optional solution, the rotating member 153 is an existing conventional rotatable component, and the rotating member 153 is used to adjust the circumferential angle of the connected clamping block 155, so as to facilitate the clamping block 155 to better clamp the pipeline 5.

[0052] In this optional solution, the jacking support box 1 also includes a range extender 6 for increasing the stroke of the jacking cylinder 16 . The range extender is used to tighten between the jacking cylinder 16 and the retaining support box 2 to extend the stroke of the jacking cylinder 16 .

[0053] Alternatively, if Figure 5-8 As shown, the retaining support box 2 includes three second support plates for forming the three faces of the square box body, and a second transverse support 24 arranged on the inner side wall of one of the second support plates in the width direction of the groove. The second transverse support 24 is telescopically arranged along the width direction of the groove to relatively tighten the retaining support box 2 along the width direction of the groove. In this optional solution, the components of the retaining support box 2 are processed from formed steel components, so that the retaining support box 2 has high overall rigidity and good support stability, and the retaining support box 2 has a relatively simple structure, and the component strength and method are basically the same as those of the jacking support box 1, and the length is slightly smaller than that of the jacking support box 1, and is mainly used for backfilling and providing jacking reaction force.

[0054] In this option, if Figure 5 As shown, the second support plate includes a second heightened section 21 and a second standard section 22 that are arranged in a plate shape, and a second connecting member 23 that serves as a connection. The second heightened section 21 and the second standard section 22 are arranged in sequence up and down along the depth direction of the groove. The second connecting member 23 is arranged between the second heightened section 21 and the second standard section 22 to fix the two in a detachable manner. In this optional scheme, the second connecting member 23 includes a connecting strip with an "H"-shaped cross-section, and a connecting bolt or a connecting screw that serves as a connection; the upper and lower long grooves of the connecting strip are respectively clamped with the bottom end of the second heightened section 21 and the top end of the second standard section 22; the connecting bolt or the connecting screw passes through the connecting strip and connects and fixes the second heightened section 21 and the second standard section 22 respectively.

[0055] In this option, if Figure 5 and Figure 6As shown, the inner side walls of the two second support plates in the width direction are also correspondingly provided with second slide grooves 25 extending along the depth direction of the groove. The second lateral support 24 includes a second inner support 242 and a second outer support 241 that are arranged in an inner and outer manner, a support jack located in the second outer support 241 and tightened between the inner end surface of the second outer support 241 and the outer end surface of the second inner support 242, and a second support slider 243 fixedly connected to the end of the second outer support 241. The second support slider 243 is slidably connected to the second slide groove 25 on the first second support plate and fixed by fasteners. The second inner support 242 is used to extend relative to the second outer support 241 under the action of the support jack and press against the second slide groove 25 on the second second support plate. In this optional scheme, if Figure 1 As shown, the second slide groove 25 is configured as a concave component, which is welded to the second supporting plate and is used for fixing and adjusting the second lateral support 24 for sliding up and down, and at the same time serves as a rib for the second supporting plate; the second supporting slider 243 is configured as a mountain-shaped component, and the connecting support is used for the second slide groove 25 to slide up and down. After being adjusted into place, the fixed end is bolted to the second slide groove 25 on one side.

[0056] Preferably, if Figure 5 As shown, the retaining box 2 also includes a jacking support rib 26 connected to the outer side wall of the second support plate arranged in the direction perpendicular to the width of the groove, and an axillary corner rib 27 connected to the connection of the two second support plates intersecting vertically. The jacking support rib 26 is used to butt against the end of the jacking cylinder 16. In this preferred embodiment, a triangular axillary corner rib 27 is added at the connection between two adjacent second support plates to strengthen the support capacity of the second support plate and also ensure the compaction of the backfill corner; a jacking support rib 26 is set on the outer side of the front end of the retaining box 2 at the position of the jacking cylinder 16, which is composed of double-jointed I-beams welded together. The jacking support rib 26 can be used to provide a jacking reaction force, and also play a reinforcing role on the overall panel.

[0057] Alternatively, if Figure 9-10 As shown, the specific operation of step "S10: preparation of support box group" is: according to the trench excavation size, depth and the structural form of the pipeline 5, the specifications of the top push support box 1 and the retaining support box 2 are determined, and the top push support box 1 and the retaining support box 2 are processed and prepared after drawing the detailed drawings of the components, so as to improve the accuracy of the prepared top push support box 1 and the retaining support box 2, and the adaptability to the excavated trench.

[0058] Alternatively, if Figure 9-10As shown, the specific operation of step "S20: first trench excavation" is: according to the type of pipeline 5, after determining the trench excavation width, the first trench excavation is carried out in the excavation area 4, and the trench excavation is carried out in layers and sections. After the first layer is excavated, the top push support box 1 is lowered, and then the excavation is carried out layer by layer to the design elevation and the top push support box 1 is pressed in batches, and finally the pipeline 5 is hoisted into the top push support box 1 for installation. During construction, when the trench is excavated to the design elevation, the hoisted pipeline 5 is placed in the two opposite clamping blocks 155 on the pipeline support 15 to install and fix the pipeline 5, and the pipeline support 15 is adjusted to ensure that the design axis and slope requirements are met.

[0059] The specific operation of step "S30: excavation and support" is: after the first section of the pipeline 5 is installed in place, the earth step excavation continues in the excavation area 4 at the front end of the pushing support box 1, and the length is consistent with the retaining support box 2. When the length meets the requirements, the retaining support box 2 is lowered, and the pushing cylinder 16 of the pushing support box 1 is retracted at the same time. The pushing cylinder 16 is pressed against the pushing support rib 26 of the retaining support box 2, and the retaining support box 2 starts the second horizontal support 24 to support the groove.

[0060] Alternatively, if Figure 9-10 As shown, step “S40: installation, backfilling and excavation repetition” specifically includes the following steps:

[0061] S401: Backfill the soil into the trench within the retaining support box 2; when backfilling, excavated soil that meets the backfill requirements or borrowed soil can be used; the trench soil backfill is carried out in layers within the retaining support box 2, and each layer of backfill is compacted with a small rammer to ensure that the compaction degree of each layer meets the design requirements.

[0062] S402: When the earthwork backfilling within the range of the retaining support box 2 is completed, the jacking support box 1 is started again to push the retaining support box 2 forward, and at the same time, a trench is excavated in the excavation area 4 at the front end of the jacking support box 1;

[0063] S403: When the jacking length meets the required length for installing the retaining support box 2 again, the retaining support box 2 is lowered and installed;

[0064] S404: Repeat the above steps in sequence, and when the jacking support box 1 meets the installation distance of the next section of the pipeline 5, the pipeline 5 is fixedly installed in the jacking support box 1.

[0065] Alternatively, step “S40: installation, backfilling and excavation repetition” specifically includes the following steps:

[0066] S401: starting the jacking support box 1 to push the retaining support box 2 forward, and at the same time backfilling the soil into the trench within the retaining support box 2, and excavating the trench in the front excavation area 4 of the jacking support box 1;

[0067] S402: When the jacking length meets the required length for installing the retaining support box 2 again, the retaining support box 2 is lowered and installed;

[0068] S403: Repeat the above steps in sequence, and when the jacking support box 1 meets the installation distance of the next section of the pipeline 5, the pipeline 5 is fixedly installed in the jacking support box 1.

[0069] Regardless of which implementation method is adopted in step S40, trench excavation and support, pipeline installation and backfilling can be realized in a continuous flow until the installation and backfilling of the entire pipeline section are completed, and the prepared jacking support box 1 and retaining support box 2 have built-in jacks, jacking cylinders, etc. that are uniformly controlled by the control room, further reducing the number of people going up and down, reducing construction safety risks, and further shortening the construction period.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for open-cut construction of a municipal pipe network, characterized in that: The following steps are involved: Preparation of a support box assembly: preparing a push support box (1) and a retaining support box (2) with adjustable width, and making the prepared push support box (1) also capable of supporting the installation of a pipeline (5) and pushing the retaining support box (2), and making the prepared retaining support box (2) capable of backfilling earth; First trench excavation: excavating the first trench in the excavation area (4), and gradually pushing in the top push support box (1) during the excavation process to support and install the first section of the pipeline (5); Excavation and support: After the first section of trench is excavated to the designed elevation, the jacking support box (1) is lowered and the pipeline (5) is installed, the jacking support box (1) is started, and the excavation area (4) in front of the jacking support box (1) is continued to be excavated. After the jacking length of the jacking support box (1) meets the required distance for the installation of the retaining support box (2), the retaining support box (2) is installed behind the jacking support box (1); Installation, backfilling and excavation are repeated: the trench within the range of the retaining support box (2) is backfilled, the jacking support box (1) is continued to be pushed forward, and the excavation area (4) in front of the jacking support box (1) is continued to be excavated, so that the retaining support box (2) is backfilled, the jacking support box (1) is pushed forward, the trench is excavated and the pipeline (5) is installed to form a repetitive flow operation.

2. The open-cut construction method for municipal pipe network according to claim 1, characterized in that: The push support box (1) comprises two first support plates arranged opposite to each other along the groove width direction, a first transverse support (14) arranged on the inner side wall of one of the first support plates, pipe support (15) arranged on the inner side walls of the two first support plates and opposite to each other, and a push oil cylinder (16) arranged on the inner side wall of at least one of the first support plates; The first transverse support (14) is telescopically arranged along the width direction of the groove, so as to relatively tighten the two first supporting plates on the two groove walls; The pipeline support (15) is telescopically arranged along the width direction of the groove to cooperate with another set of correspondingly arranged pipeline support (15) to relatively clamp and fix the pipeline (5); The push oil cylinder (16) is telescopically arranged along the longitudinal direction of the groove to be used for tightening the earth retaining support box (2) located at the rear.

3. The open-cut construction method for municipal pipe network according to claim 2 is characterized in that: The inner side walls of the two first supporting plates are also provided with first sliding grooves (17) extending in the groove depth direction; The first transverse support (14) comprises a first inner support (142) and a first outer support (141) which are arranged in an inner and outer manner, a support jack located in the first outer support (141) and braced between the inner end surface of the first outer support (141) and the outer end surface of the first inner support (142), and a first support slider (143) fixedly connected to the end of the first outer support (141); The first supporting sliding block (143) is slidably connected to the first sliding groove (17) on the first first supporting plate and is fixed by a fastener; The first inner support (142) is used to extend relative to the first outer support (141) under the action of the support jack and abut against the first slide groove (17) on the second first support plate.

4. The open-cut construction method for municipal pipe network according to claim 2, characterized in that: The inner side walls of the two first supporting plates are also provided with slideways (18) extending in the depth direction of the grooves, and both ends of the slideways (18) are also provided with adjustment jacks (19) that can be extended and retracted in the extending direction of the slideways (18); The end of the pipeline support (15) is slidably connected to the corresponding slide groove and is located between the upper and lower groups of adjustment jacks (19).

5. The open-cut construction method for municipal pipe network according to claim 4 is characterized in that: The pipeline support (15) comprises a support slider (154) slidably connected to the slideway (18), a first support section (151) and a second support section (152) axially sleeved, a rotating member (153) rotatably connected to the extended end of the second support, and a clamping block (155) connected to the rotating member (153); The end of the first support (151) is fixedly connected to the supporting sliding block (154).

6. The open-cut construction method for municipal pipe network according to claim 1, characterized in that: The retaining support box (2) comprises three second support plates for forming three surfaces of the square box body, and a second transverse support (24) arranged on the inner side wall of one of the second support plates in the groove width direction; The second transverse support (24) is telescopically arranged along the width direction of the trench so as to relatively tighten the earth retaining support box (2) along the width direction of the trench.

7. The open-cut construction method for municipal pipe network according to claim 6, characterized in that: The second supporting plate comprises a second heightened section (21) and a second standard section (22) which are arranged in a plate shape, and a second connecting member (23) which serves as a connection; the second heightened section (21) and the second standard section (22) are arranged in sequence up and down along the depth direction of the groove; the second connecting member (23) is arranged between the second heightened section (21) and the second standard section (22) to detachably fix the two. The inner side walls of the two second supporting plates in the width direction are also provided with second slide grooves (25) extending in the groove depth direction; the second transverse support (24) comprises a second inner support (242) and a second outer support (241) arranged in an inner and outer manner, a support jack located in the second outer support (241) and braced between the inner end surface of the second outer support (241) and the outer end surface of the second inner support (242), and a second support slider (243) fixedly connected to the end of the second outer support (241); the second support slider (243) is slidably connected to the second slide groove (25) on the first second supporting plate and fixed by a fastener; the second inner support (242) is used to extend relative to the second outer support (241) under the action of the support jack and press against the second slide groove (25) on the second second supporting plate.

8. The open-cut construction method for municipal pipe network according to claim 1, characterized in that: The specific operation of the step "preparation of the support box group" is as follows: according to the trench excavation size, depth and the structure of the pipeline (5), the specifications of the top push support box (1) and the retaining support box (2) are determined, and the top push support box (1) and the retaining support box (2) are processed and prepared after drawing the detailed drawings of the components; The specific operation of the step "first trench excavation" is as follows: according to the type of pipeline (5), after determining the trench excavation width, the first trench excavation is carried out in the excavation area (4), and the trench excavation is carried out in layers and sections. After the first layer is excavated, the top push support box (1) is lowered, and then the excavation is carried out layer by layer to the design elevation and the top push support box (1) is pressed in batches. Finally, the pipeline (5) is hoisted into the top push support box (1) for installation.

9. The open-cut construction method for municipal pipe network according to claim 1, characterized in that: The step "install, backfill and excavate repeatedly" specifically includes the following steps: Backfilling the earth into the trench within the earth retaining support box (2); When the earthwork backfilling within the range of the retaining support box (2) is completed, the jacking support box (1) is started again to push the retaining support box (2) forward, and at the same time, a trench is excavated in the excavation area (4) at the front end of the jacking support box (1); When the jacking length again meets the length required for the installation of the retaining support box (2), the retaining support box (2) is lowered and installed; The above steps are repeated in sequence, and when the jacking support box (1) meets the installation distance of the next section of the pipeline (5), the pipeline (5) is fixedly installed in the jacking support box (1).

10. The open-cut construction method for municipal pipe network according to claim 1, characterized in that: The step "install, backfill and excavate repeatedly" specifically includes the following steps: The jacking support box (1) is started to push against the retaining support box (2) to push forward, and at the same time, earth is backfilled into the trench within the retaining support box (2), and a trench is excavated in the front excavation area (4) of the jacking support box (1); When the jacking length again meets the length required for the installation of the retaining support box (2), the retaining support box (2) is lowered and installed; The above steps are repeated in sequence, and when the jacking support box (1) meets the installation distance of the next section of the pipeline (5), the pipeline (5) is fixedly installed in the jacking support box (1).

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