CN110864161B

CN110864161B - Construction method of steam buried pipe structure

Info

Publication number: CN110864161B
Application number: CN201910998587.2A
Authority: CN
Inventors: 黄旭东; 谷学伟; 吴佩英
Original assignee: China Machinery International Engineering Design and Research Institute Co Ltd
Current assignee: China Machinery International Engineering Design and Research Institute Co Ltd
Priority date: 2019-10-21
Filing date: 2019-10-21
Publication date: 2021-06-15
Anticipated expiration: 2039-10-21
Also published as: CN110864161A

Abstract

The invention discloses a construction method of a steam buried pipe structure, which comprises the following steps: a mounting groove which is concave and ditch-shaped is constructed on the road surface. And a reinforced concrete pipe trench extending along the length direction of the installation groove is constructed in the installation groove, a pipe penetrating trench sleeve and an optical fiber sleeve are pre-embedded in the end wall in the process of constructing the reinforced concrete pipe trench, a plurality of supporting pedestals sequentially arranged at intervals along the length direction of the bottom plate are constructed on the bottom plate, and a reinforced concrete cover plate is prefabricated. Preparing a fixed support, a guide support and a steam casing section, connecting the fixed support and the guide support to corresponding supporting pedestals, splicing the steam casing sections to form steam casings supported on the fixed support and the guide support, and enabling two ends of each steam casing to extend out of the reinforced concrete pipe trench from the pipe trench casing at the corresponding end. After the reinforced concrete pipe ditch is filled with the first heat preservation filler, the reinforced concrete cover plate is hoisted to close the reinforced concrete pipe ditch. And restoring the soil filling around the installation groove and completing the repair of the road structure layer on the upper side of the installation groove.

Description

Construction method of steam buried pipe structure

Technical Field

The invention relates to the technical field of steam buried pipe construction, in particular to a construction method of a steam buried pipe structure.

Background

With the development of social economy, the heat demand of domestic enterprises increases year by year, and the construction engineering quantity and the conveying distance of steam pipelines are increased. In the process of steam pipeline construction, the steam pipeline is often buried and laid in consideration of urban beauty, limited ground overhead and the like.

The conventional buried steam pipeline adopts a steel-sleeve steel direct-buried technology, namely, a steam steel sleeve is directly buried underground. Because the steam steel sleeve is directly buried underground, an anticorrosive coating on an outer sleeve of the steam steel sleeve is easy to fall off to cause corrosion failure; because the steam steel sleeve is directly buried underground and no heat preservation and buffering measures are set, the outer sleeve positioned under the roadway is easy to be impacted and deformed to influence the operation of the steam sleeve; because the steam steel sleeve is directly buried underground and no heat preservation and buffering measures are arranged, the temperature of soil and the ground surface is easily overhigh, and further, peripheral flowers, plants and trees can not survive and even scald accidents are caused; because the steam steel sleeve is directly buried underground, the safety and the economical efficiency of the pipeline operation are greatly influenced under the conditions that the pipeline is seriously drained along the way and the like.

Disclosure of Invention

The invention provides a construction method of a steam buried pipe structure, which aims to solve the technical problems that the steam buried pipe structure constructed by the existing construction method is poor in heat insulation effect and easy to damage due to dynamic load impact of a vehicle.

The technical scheme adopted by the invention is as follows:

a construction method of a steam buried pipe structure comprises the following steps: s10: constructing an installation groove which extends along the steam conveying direction and is concave inwards to form a channel shape on the road surface according to a construction design drawing; s20: constructing a reinforced concrete pipe trench extending along the length direction of the installation groove, wherein the reinforced concrete pipe trench is formed by enclosing a bottom plate, side walls positioned on two sides of the extension direction and end walls positioned at two ends; s30: preparing a fixed support, a guide support and a steam casing section, connecting the fixed support and the guide support to corresponding supporting pedestals, splicing the steam casing sections to form a steam casing which is supported on the fixed support and the guide support and used for conveying steam, and enabling two ends of the steam casing to respectively extend out of the reinforced concrete pipe trench from the pipe trench casing pipes at the corresponding ends; s40: after filling a first heat-preservation filler for carrying out heat insulation and heat preservation on the steam sleeve in the reinforced concrete pipe trench, hoisting a reinforced concrete cover plate to close the reinforced concrete pipe trench; s60: and restoring the soil filling around the installation groove and completing the repair of the road structure layer on the upper side of the installation groove.

Further, step S10 specifically includes the following steps: excavating a foundation groove extending along the steam conveying direction on the ground according to a construction design drawing; carrying out compaction treatment on the base groove to enable the base groove to reach the bearing capacity specified by design; a concrete cushion layer extending along the length direction of the foundation trench is constructed on a trench bottom plate of the foundation trench.

Furthermore, the supporting pedestal comprises a supporting platform fixedly supported on the bottom plate, a connecting steel plate paved on the top of the supporting platform, and a connecting steel bar which is pre-embedded in the supporting platform and connected with the connecting steel plate; the construction of the reinforced concrete pipe trench and the support pedestal in the step S20 specifically comprises the following steps: binding steel bars at three design positions of a bottom plate, a side wall and an end wall on a bottom plate of the installation groove, and binding the steel bars of the support platform on the binding steel bars of the bottom plate; and (3) carrying out mould planting pouring on the bottom plate, the side wall, the end wall and the supporting platform on the binding steel bars, and pre-burying a connecting steel plate and connecting steel bars in the supporting platform before pouring of the supporting platform.

Further, the pipe penetrating ditch sleeve comprises a hollow cylindrical pipe penetrating which is embedded in the end wall, a first annular baffle plate sleeved on the outer circle of the pipe penetrating, and a first reinforcing rib plate which is used for connecting and supporting the first annular baffle plate and the pipe penetrating pipe; the optical fiber sleeve comprises a hollow tubular optical fiber through pipe embedded in the end wall and a water stop ring sleeved on the outer circle of the optical fiber through pipe, the optical fiber through pipe is positioned above the through pipe, one end of the optical fiber through pipe extends out of the end wall and then extends into the reinforced concrete pipe ditch, and the other end of the optical fiber through pipe extends out of the ground after extending out of the end wall.

Furthermore, the reinforced concrete cover plate comprises a plurality of concrete cover plate pieces; and hanging rings for hoisting are pre-buried at two ends of each concrete cover plate sheet when each concrete cover plate sheet is prefabricated.

Further, step S30 specifically includes the following steps: s31: customizing a fixed support, a guide support and a steam casing section according to a design drawing; s33: after the fixed support, the guide support and the steam casing section are hoisted in place according to a construction design drawing, the fixed support and the correspondingly arranged supporting pedestal and the steam casing section are respectively welded and fixed, and the guide support and the correspondingly arranged steam casing section are welded and fixed; s34: welding and connecting adjacent steam sleeve sections; s36: and carrying out rust removal and corrosion prevention treatment on the fixed support, the guide support and the steam sleeve.

Further, after the step S31 is completed, and before the step S33 is performed, the method further includes the step S32: waterproof sleeves are respectively arranged on the excircles of the steam sleeve sections positioned at the two ends of the steam sleeve; after step S34 is completed, and before step S36 is performed, step S35 is further included: respectively welding and fixing the waterproof sleeve with the pipe-penetrating groove sleeve and the steam sleeve section which are correspondingly arranged; and step S36, performing rust removal and corrosion prevention treatment on the waterproof sleeve.

Furthermore, the steam casing pipe section comprises a steam pipe for conveying steam, an outer sleeve sleeved outside the steam pipe, a second heat-insulating filler filled between the steam pipe and the outer sleeve, a heat-insulating support arranged between the steam pipe and the outer sleeve and used for supporting the steam pipe, and temporary supports arranged at two ends of the steam pipe and used for temporarily supporting the steam pipe; the temporary support is fixed with the outer sleeve, and the temporary support surrounds and fixes the steam pipe through the hoop of the temporary support.

Further, step S34 specifically includes the following steps: welding and connecting steam pipes of adjacent steam casing pipe sections; removing the temporary support between the connected steam pipes, and performing rust removal and paint brushing treatment on the welded junctions and the peripheries between the connected steam pipes; performing heat preservation filler joint coating operation on a second heat preservation filler on the periphery of the connected steam pipe; and welding and connecting the outer sleeves corresponding to the connected steam pipes.

Further, after the step S40 is completed and before the step S60 is performed, the method further includes the steps of: s50: and carrying out integral waterproof treatment on the periphery of the reinforced concrete pipe trench and the reinforced concrete cover plate, and filling waterproof filler between the pipe trench bushing and the steam bushing.

The invention has the following beneficial effects:

the construction method of the steam buried pipe structure can be used for quickly and efficiently constructing the steam buried pipe structure, and in the steam buried pipe structure, the steam sleeve is externally provided with the reinforced concrete pipe box which is formed by enclosing the reinforced concrete pipe ditch and the reinforced concrete cover plate 50, so that under the action of the reinforced concrete pipe box, the steam sleeve can meet the traffic of various load-carrying vehicles on the ground without large burial depth, and the steam sleeve is effectively protected from the impact of the dynamic load of the vehicle, so that the technical problem that the steam sleeve is easy to impact by the dynamic load of the vehicle in the conventional construction method can be effectively solved by adopting the construction method of the steam buried pipe structure; and because the hollow cavity of the reinforced concrete trench is also filled with the first heat-insulating filler for carrying out heat insulation on the steam sleeve, and the first heat-insulating filler is coated outside the steam sleeve, the heat dissipation loss of the steam sleeve can be effectively reduced, the heat supply effect of the steam sleeve is enhanced, and the steam sleeve has better heat insulation performance.

In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is an elevation view of a steam buried pipe structure constructed and formed by the construction method according to the preferred embodiment of the present invention;

FIG. 2 is a cross-sectional view of FIG. 1;

FIG. 3 is a schematic view of a trench bushing and a waterproof bushing connection;

FIG. 4 is a schematic view of a side wall construction joint water stopping method;

fig. 5 is a plan view of a concrete cover sheet.

Description of the figures

10. Reinforced concrete pipe ditches; 11. a base plate; 12. a side wall; 13. an end wall; 20. a pipe-penetrating groove sleeve; 21. pipe penetrating and pipe communicating; 22. a first annular baffle; 23. a first reinforcing rib; 30. a fiber optic ferrule; 31. an optical fiber through pipe; 40. a support pedestal; 41. a support platform; 42. connecting steel plates; 50. a reinforced concrete cover plate; 51. a concrete cover plate sheet; 52. a hoisting ring; 60. a concrete cushion layer; 70. fixing a bracket; 80. a guide bracket; 90. a steam jacket section; 91. a steam pipe; 92. an outer sleeve; 93. a second insulation filler; 94. a thermally insulating support; 110. a waterproof sleeve; 111. a waterproof oversleeve; 112. a second annular baffle; 113. a second reinforcing rib; 120. a first insulating filler; 130. waterproof filler; 140. a temperature sensing optical fiber; 150. protecting a sacrificial anode; 160. a steel plate water stop.

Detailed Description

The embodiments of the invention will be described in detail below with reference to the accompanying drawings, but the invention can be embodied in many different forms, which are defined and covered by the following description.

Referring to fig. 1 and 2, a preferred embodiment of the present invention provides a steam ground pipe laying structure construction method, including the steps of:

s10: according to a construction design drawing, an installation groove which extends along the steam conveying direction and is concave inwards to form a ditch shape is constructed on the road surface.

S20: a reinforced concrete pipe trench 10 extending along the length direction of the installation groove is constructed in the installation groove, the reinforced concrete pipe trench 10 is formed by enclosing a bottom plate 11, side walls 12 positioned on two sides in the extending direction and end walls 13 positioned at two ends, a pipe trench penetrating sleeve 20 and an optical fiber sleeve 30 are pre-embedded in the end walls 13 in the process of constructing the reinforced concrete pipe trench 10, a plurality of supporting pedestals 40 sequentially arranged at intervals along the length direction of the bottom plate 11 are constructed on the bottom plate 11 when the reinforced concrete pipe trench 10 is constructed, and a reinforced concrete cover plate 50 used for sealing the opening of the reinforced concrete pipe trench 10 is prefabricated.

S30: preparing a fixed support 70, a guide support 80 and a steam casing section 90, connecting the fixed support 70 and the guide support 80 to the corresponding support pedestal 40, splicing the steam casing section 90 to form a steam casing supported on the fixed support 70 and the guide support 80 and used for conveying steam, and enabling two ends of the steam casing to respectively extend out of the reinforced concrete pipe ditch 10 from the pipe-penetrating ditch casing 20 at the corresponding end.

S40: after the first heat insulating filler 120 for performing heat insulation and heat preservation on the steam sleeve is filled in the reinforced concrete pipe trench 10, the reinforced concrete cover plate 50 is hoisted to close the reinforced concrete pipe trench 10.

S60: and restoring the soil filling around the installation groove and completing the repair of the road structure layer on the upper side of the installation groove.

The construction method of the steam buried pipe structure can be used for quickly and efficiently constructing the steam buried pipe structure, and in the steam buried pipe structure, the steam sleeve is externally provided with the reinforced concrete pipe box which is formed by enclosing the reinforced concrete pipe ditch 10 and the reinforced concrete cover plate 50, so that under the action of the reinforced concrete pipe box, the steam sleeve can meet the passing requirements of various ground load-carrying vehicles without large burial depth, and the steam sleeve is effectively protected from the impact of the dynamic load of the vehicle, so that the technical problem that the steam sleeve is easy to be impacted by the dynamic load of the vehicle in the conventional construction method can be effectively solved by adopting the construction method of the steam buried pipe structure; and because the hollow cavity of the reinforced concrete trench 10 is also filled with the first heat-insulating filler 120 for heat insulation of the steam sleeve, and the first heat-insulating filler 120 is coated outside the steam sleeve, the heat dissipation loss of the steam sleeve can be effectively reduced, the heat supply effect of the steam sleeve is enhanced, and the steam sleeve has better heat insulation performance, so that the heat influence of the steam buried pipe project on the surrounding environment can be effectively reduced, and the safety and the economy of the steam buried pipe project are improved by adopting the construction method of the steam buried pipe structure.

Optionally, step S10 specifically includes the following steps:

and excavating a foundation trench extending along the steam conveying direction on the ground according to a construction design drawing.

The base groove is densified to achieve a design specified load bearing capacity.

A concrete pad 60 extending in the length direction of the foundation trench is constructed on the trench floor of the foundation trench.

Specifically, the base groove design typically provides a load bearing capacity of not less than 200 kPa. The concrete cushion layer 60 is a C15 concrete cushion layer with the thickness of 8 cm-15 cm, and each side of the concrete cushion layer 60 is wider than a steel reinforced concrete pipe ditch 10 bottom plate with the thickness of 8 cm-12 cm, as shown in figure 2.

According to the requirements of construction design drawings, when the reinforced concrete pipe trench 10 shown in fig. 1 and 2 is constructed, the bottom plate 11 of the reinforced concrete pipe trench 10 is 30 cm-40 cm thick, the side wall 12 is 20 cm-30 cm thick, and the end wall 13 is 35 cm-45 cm thick. In order to facilitate the welding and installation of the later steam casing section 90, the clear distance between the inner wall of the side wall 12 and the outer wall of the steam casing is 40 cm-60 cm, the clear width of the inner side of the reinforced concrete pipe ditch 10 is 40 cm-60 cm + D +40 cm-60 cm (wherein D is the outer diameter of the steam casing, 40 cm-60 cm is the clear distance between the outer wall of the steam casing and the inner wall of the reinforced concrete pipe ditch 10, the clear height of the inner side of the reinforced concrete pipe ditch 10 is 40 cm-60 cm + D +20 cm-30 cm (wherein D is the outer diameter of the steam casing, 40 cm-60 cm is the clear distance between the outer wall of the steam casing and the

bottom plate

11, and 20 cm-30 cm is the clear distance between the outer wall of the steam casing and the top of the reinforced concrete pipe ditch 10), the length of the reinforced concrete pipe ditch 10 is specifically determined according to the actual width condition of a road, and the two ends of the.

Alternatively, as shown in fig. 1 and 2, the supporting pedestal 40 includes a supporting platform 41 fixedly supported on the bottom plate 11, a connecting steel plate 42 laid on the top of the supporting platform 41, and a connecting steel bar embedded in the supporting platform 41 and connected to the connecting steel plate 42.

The construction of the reinforced concrete trench 10 and the support pedestal 40 in the step S20 includes the following steps:

and (3) binding steel bars at three design positions of the bottom plate 11, the side wall 12 and the end wall 13 on the bottom plate of the installation groove, and binding the steel bars of the supporting platform 41 on the binding steel bars of the bottom plate 11.

And (3) carrying out mould planting pouring on the bottom plate 11, the side wall 12, the end wall 13 and the supporting platform 41 on the binding steel bars, and embedding the connecting steel plates 42 and the connecting steel bars in the supporting platform 41 before pouring of the supporting platform 41.

Specifically, after the concrete of the concrete cushion layer 60 is initially set to a certain strength, the steel bars of the bottom plate 11, the side wall 12 and the end wall 13 of the reinforced concrete pipe trench 10 are bound, the steel bars of the support platform 41 are bound on the bound steel bars of the bottom plate 11, the main bars of the bottom plate 11 are arranged to be phi 14@150, the main bars of the side wall 12 are arranged to be phi 14@100, and double-layer HRB 400-level steel bars are used for binding the steel bars. After the steel bars are bound, the bottom plate 11, the side walls 12, the end walls 13 and the supporting platform 41 are planted and poured, the bottom plate 11, the side walls 12 and the end walls 13 are all made of C30 concrete, the impervious grade is S6, the impact resistance is high, and the impact of the passage of various load-carrying vehicles on the ground on the steam sleeves buried underground can be effectively prevented; for the convenience of formwork-planting pouring, the side walls 12 and the end walls 13 are poured to a position 25-35 cm above the bottom plate 11, the-300 x3 full-length steel plate water stop belts 160 are arranged at the joints of the upper and lower walls, as shown in fig. 4, and then secondary pouring is performed to the final elevation. The height of the supporting platform 41 is 20 cm-30 cm, the length along the direction of the steam sleeve is 40 cm-60 cm, and the width perpendicular to the direction of the steam sleeve is as wide as the steam sleeve; a connecting steel plate 42 with the thickness of 1 cm-1.5 cm is paved in the middle of the top of the supporting platform 41, the length of the connecting steel plate 42 along the steam casing is equal to that of the supporting platform 41, and the width of the connecting steel plate 42 perpendicular to the direction of the steam casing is D (D is the outer diameter of the steam casing). And the back of the connecting steel plate 42 is welded with connecting steel bars, the connecting steel bars adopt HRB400 grade, phi 12@200 and have the length of 30 cm-50 cm. During design, the setting distance of the supporting platform 41 is determined after calculation according to the conditions of the load and the temperature of the steam sleeve.

Optionally, as shown in fig. 3, the pipe-penetrating duct 20 includes a hollow cylindrical pipe-penetrating 21 embedded in the end wall 13, a first annular baffle 22 sleeved on an outer circumference of the pipe-penetrating 21, and a first reinforcing rib plate 23 connecting and supporting the first annular baffle 22 and the pipe-penetrating pipe 21, the pipe-penetrating duct 20 can bear an axial thrust generated by pushing the waterproof casing 110 during subsequent construction after thermal expansion of the steam casing, and the pipe-penetrating duct 20 can also play a role of stopping water, so as to prevent external groundwater from entering the reinforced concrete pipe trench 10 from a gap between the pipe-penetrating duct 20 and the steam casing. The optical fiber sleeve 30 comprises a hollow tubular optical fiber through pipe 31 embedded in the end wall 13 and a water stop ring sleeved on the outer circle of the optical fiber through pipe 31, the optical fiber through pipe 31 is located above the through pipe 21, one end of the optical fiber through pipe 31 extends out of the end wall 13 and then extends into the reinforced concrete pipe ditch 10, and the other end of the optical fiber through pipe 31 extends out of the ground after extending out of the end wall 13. Specifically, the height between the inner diameter and the outer diameter of the water stop ring is 4 cm-6 cm, and the thickness is 2 mm-4 mm. Preferably, the extension end of the optical fiber through pipe 31 extending out of the ground is designed to prevent the intrusion of inverted U-shaped rainwater, so that rainwater is effectively prevented from entering the reinforced concrete pipe trench 10 through the extension end of the optical fiber through pipe 31; meanwhile, the optical fiber through pipe 31 can also be used as a tiny vent hole of the reinforced concrete pipe ditch 10, so that the condition that the pressure in the groove of the reinforced concrete pipe ditch 10 is too high when the steam casing is in a hot state can be effectively prevented, the adverse effect on a sealing and waterproof structure is further caused, and the safety and reliability of the work of the steam buried pipe structure are ensured.

Alternatively, as shown in fig. 5, the reinforced-concrete cover plate 50 includes a plurality of concrete cover plates 51. When each concrete cover plate 51 is prefabricated, hanging rings 52 for hoisting are pre-buried at two ends of each concrete cover plate 51. Specifically, the thickness of the concrete cover plate is 20 cm-30 cm, the length of the concrete cover plate is 40 cm-60 cm along the direction of the steam sleeve, and the width of the concrete cover plate perpendicular to the direction of the steam sleeve is as wide as the opening side of the reinforced concrete pipe trench 10. The precast concrete cover plate piece 51 adopts C30 concrete with impervious grade S6, the reinforcing steel bars adopt HRB400 grade, the phi 20 main reinforcing steel bars are arranged in two layers, and meanwhile, a pair of phi 12 hanging rings are arranged at the position of the top of the concrete cover plate piece 51, which is in the same width direction with the reinforced concrete pipe ditch 10 and is 20 cm-40 cm away from the outer edge, so that construction and hoisting are facilitated.

Optionally, as shown in fig. 1 and fig. 2, step S30 specifically includes the following steps:

s31: the fixing bracket 70, the guide bracket 80 and the steam jacket pipe section 90 are customized according to the design drawing.

S33: after the fixing support 70, the guide support 80 and the steam casing section 90 are hoisted in place according to the construction design drawing, the fixing support 70 is respectively welded and fixed with the correspondingly arranged supporting pedestal 40 and the steam casing section 90, and the guide support 80 is welded and fixed with the correspondingly arranged steam casing section 90.

S34: adjacent steam jacket segments 90 are welded together.

S36: the fixed support 70, the guide support 80 and the steam sleeve are subjected to rust removal and corrosion prevention treatment.

Specifically, in step S31, the fixing bracket 70, the guide bracket 80 and the steam sleeve section 90 are usually customized by the manufacturer, and the customized height of the fixing bracket 70 and the guide bracket 80 is generally 20cm to 30 cm. When the steam casing pipe section 90 is customized, the steam pipe 91, the outer casing 92, the second heat-insulating filler 93 and the heat-insulating support 94 of the steam casing pipe section 90 are combined into a whole according to the required assembly length, the end of each steam pipe 91 is 15-20 cm longer than the outer casing, the steam pipe 91 is fixed in the outer casing 92 by the temporary support at the end of each steam casing pipe section 90, and the temporary support surrounds the steam pipe 91 through the hoop and is connected with the outer casing 92 in a welding mode. After the anchor ear is properly released, the steam pipe 91 can be moved in the axial direction to facilitate welding. Except that about 12-15 cm of each end of the steam pipe 91 and the outer sleeve 92 is reserved for welding and the rust removal and corrosion prevention are not performed temporarily, the rust removal and corrosion prevention of the outer sleeve 92, the fixed support 70 and the guide support 80 are finished in a factory.

Alternatively, as shown in fig. 1 and 2, after the step S31 is completed and before the step S33 is performed, the method further includes the step S32:

waterproof casings 110 are respectively installed on the outer circumferences of the steam casing sections 90 located at both ends of the steam casing.

After step S34 is completed, and before step S36 is performed, step S35 is further included:

the waterproof casing 110 is welded and fixed with the pipe-penetrating groove casing 20 and the steam casing section 90 which are correspondingly arranged.

Step S36 further includes performing rust removal and corrosion prevention treatment on waterproof sleeve 110.

Specifically, the steps S32 and S33 are specifically: firstly, placing a customized fixed bracket 70 and a customized guide bracket 80 on a corresponding supporting platform 41; verifying the position of each steam casing section 90 according to an assembly drawing provided by a manufacturer, respectively installing waterproof casings 110 on the steam casing sections 90 at two ends of the reinforced concrete pipe trench 10, and temporarily fixing the steam casing sections near a normal installation position after adjustment; then, the sections of steam jacket pipe sections 90 are hoisted in place according to the requirements of the assembly drawing, and the steam jacket pipe sections 90 lacking support are temporarily supported by adopting square timbers. According to the requirements of the assembly drawing, after the positions of all points are accurately adjusted, the contact positions of the fixed support 70, the guide support 80 and the steam sleeve section 90 are fully welded, and meanwhile, the periphery of the fixed support 70 and the periphery of the connecting steel plate 42 on the correspondingly arranged supporting platform 41 are fully welded.

Alternatively, as shown in fig. 1 and 2, the steam jacket 90 includes a steam pipe 91 for conveying steam, an outer jacket 92 fitted around the steam pipe 91, a second insulating filler 93 filled between the steam pipe 91 and the outer jacket 92, an insulating support 94 disposed between the steam pipe 91 and the outer jacket 92 for supporting the steam pipe 91, and temporary supports disposed at both ends of the steam pipe 91 for temporarily supporting the steam pipe 91. The temporary support is fixed with the outer sleeve 92, and the temporary support surrounds and fixes the steam pipe 91 through the hoop thereof.

Optionally, as shown in fig. 1 and fig. 2, step S34 specifically includes the following steps:

the steam tubes 91 of adjacent steam jacket sections 90 are welded together.

The temporary supports between the connected steam pipes 91 are removed, and the weld joints and the peripheries between the connected steam pipes 91 are subjected to rust removal and painting treatment.

And performing heat preservation filler joint coating operation on the second heat preservation filler 93 on the periphery of the connected steam pipe 91.

The outer sleeve 92 corresponding to the connected steam pipe 91 is welded.

Specifically, after the hoop on the steam pipe 91 is properly loosened, the steam pipes 91 of the adjacent steam casing sections 90 are welded and connected after the axial fine adjustment and the accurate opening alignment are performed on the adjacent steam pipes 91; after welding is finished, the temporary support between the steam pipes 91 is removed, and the weld craters and the periphery between the steam pipes 91 are subjected to rust removal and paint brushing; after the paint film is dried, performing heat preservation filler joint coating operation on the second heat preservation filler 93 connected with the periphery of the steam pipe 91, wherein the heat preservation filler joint coating operation is required to be well overlapped with the original second heat preservation filler 93 in a layered staggered joint manner, so that the heat preservation effect is ensured; the width of the gap between adjacent outer sleeves 92 is measured, pipe sections with the same width are cut from the steel pipes with the same specification and cut from the middle, and the upper half arc and the lower half arc are in butt joint with the gap of the outer sleeve 92 and then are in welded connection.

Specifically, the operation step of "respectively welding and fixing the waterproof casing 110 and the pipe penetrating groove casing 20 and the steam casing section 90 which are correspondingly arranged" is specifically: the waterproof oversleeve 111 of the waterproof sleeve 110 is fixed and welded with the through pipe 21 after being aligned; a second annular baffle plate 112 which is 15 cm-25 cm high and 1.2 cm-2 cm thick is arranged close to the other end of the waterproof sleeve 111, and the second annular baffle plate 112 is welded with the waterproof sleeve 111 and the outer sleeve 92 along the circumferential direction; then, respectively 8 second reinforcing ribs 113 are symmetrically welded on the left side and the right side of the second annular baffle 112; after the welding is finished, bolts at two sides of the guide rod on the circumference of the waterproof oversleeve 111 are loosened to the outermost side of the thread; and finally, cleaning and derusting exposed parts of the steel members, such as the fixing support 70, the guide support 80, the outer sleeve 92, the waterproof oversleeve 111, the second annular baffle 112, the second reinforcing rib plate 113 and the like. The rust removal grade is not lower than St3, and the epoxy zinc-rich primer, the epoxy mica iron paint and the aliphatic polyurethane finish paint are brushed for corrosion prevention within 24 hours after rust removal, wherein the minimum dry film thickness of each primer is 50 mu m, the minimum dry film thickness of each mica iron paint is 100 mu m, and the minimum dry film thickness of each topcoat is 40 mu m.

Optionally, step S40 specifically includes: filling the reinforced concrete pipe trench 10 with external thermal insulation material leftover materials (magnesium silicate fiber needled blanket, aluminum silicate fiber needled blanket, high-temperature glass cotton, silicon dioxide aerogel thermal insulation felt and the like) in the thermal insulation construction process of the external overhead pipeline, after layering and compacting to the top elevation of the outer sleeve 92, penetrating the distributed temperature sensing optical fibers 140 through the optical fiber through pipe 31, enabling the temperature sensing optical fibers 140 to be close to the outer wall surface of the steam sleeve along the direction of the steam sleeve and be installed loosely properly, covering the position 5-10 cm higher than the top of the reinforced concrete pipe trench 10 with the external thermal insulation material leftover materials, arranging the temperature sensing optical fibers 140 in the first thermal insulation filler 120 and extending along the length direction of the steam sleeve, and sensing the temperature of different length positions on the steam sleeve in real time by the temperature sensing optical fibers 140; the temperature alarm display equipment connected with the temperature sensing optical fiber 140 is arranged on the ground and connected with the temperature sensing optical fiber 140, is used for displaying the temperature conditions of different length positions on the steam sleeve in real time and giving an alarm when the temperature is abnormal, thereby effectively ensuring the working safety of the steam buried pipe system; finally, the reinforced concrete cover plate 50 is hoisted in place, and the first heat-insulating filler 120 (leftover material of the outer heat-insulating material) in the reinforced concrete pipe trench 10 is compacted. The leftover materials of the external thermal insulation materials are used as thermal insulation fillers of the steam sleeve to be filled in the hollow cavity of the reinforced concrete pipe ditch 10, so that a good thermal insulation and heat storage effect is achieved, further the heat loss of the steam sleeve can be reduced, the heat influence of the steam sleeve to the surrounding environment is reduced to the minimum, meanwhile, the waste utilization measure is beneficial to environmental protection, the treatment cost of solid waste can be saved, and better energy-saving and environment-friendly benefits are achieved.

After step S40 is completed, and before step S60 is performed, the method further includes the steps of:

s50: the periphery of the reinforced concrete pipe trench 10 and the reinforced concrete cover plate 50 are subjected to integral waterproof treatment, and waterproof filler 130 is filled between the pipe trench bushing 20 and the steam bushing.

Specifically, rubber asphalt waterproof paint with the thickness of 2 mm-3 mm is firstly constructed on the upper parts of the side walls 12, the end walls 13 and the reinforced concrete cover plate 50, then asphalt waterproof coiled materials with the thickness of 6 mm-8 mm are pasted, and two layers of construction are adopted to form a closed water stop ring; a flexible waterproof filler 130 is filled between the pipe-penetrating groove sleeve 20 and the steam sleeve, and the flexible waterproof filler 130 can be selected from on-site foaming polyurethane, asphalt mastic, putty type water-swelling water stop strip and the like; the outer sleeve 92 buried in the soil is protected by sacrificial anode 150, the proper type of metal anode is selected according to the difference of soil resistivity, and current and voltage test piles are arranged on the ground to facilitate periodic detection, and the part is generally constructed under the guidance of pipeline anticorrosion professional manufacturers.

Step S60 specifically includes: in order to control the integral burial depth of the reinforced concrete pipe trench 10, the distance between the top of the reinforced concrete cover plate 50 and the road surface is 8 cm-12 cm; if the pavement is a concrete pavement, D10 steel mesh sheets are required to be arranged when the pavement is restored in order to prevent the pavement from cracking, and the distance is 10cmx10 cm; if the pavement is an asphalt pavement, after the polyester anti-cracking cloth is fully paved, asphalt concrete is poured to the road elevation.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The construction method of the steam buried pipe structure is characterized by comprising the following steps:

s10: constructing an installation groove which extends along the steam conveying direction and is concave inwards to form a channel shape on the road surface according to a construction design drawing;

s20: constructing a reinforced concrete pipe trench (10) extending along the length direction of the installation groove in the installation groove, wherein the reinforced concrete pipe trench (10) is formed by enclosing a bottom plate (11), side walls (12) positioned on two sides of the extending direction and end walls (13) positioned at two ends, pipe penetrating sleeve pipes (20) and optical fiber sleeve pipes (30) are pre-embedded in the end walls (13) in the process of constructing the reinforced concrete pipe trench (10), a plurality of supporting pedestals (40) which are sequentially arranged at intervals along the length direction of the bottom plate (11) are constructed on the bottom plate (11) in the process of constructing the reinforced concrete pipe trench (10), and a reinforced concrete cover plate (50) for sealing an opening of the reinforced concrete pipe trench (10) is prefabricated;

s30: preparing a fixed support (70), a guide support (80) and a steam sleeve section (90), connecting the fixed support (70) and the guide support (80) to the corresponding supporting pedestal (40), splicing the steam sleeve section (90) to form a steam sleeve which is supported on the fixed support (70) and the guide support (80) and used for conveying steam, and enabling two ends of the steam sleeve to respectively extend out of the reinforced concrete pipe ditch (10) from the pipe-penetrating ditch sleeve (20) at the corresponding end;

s40: after filling a first heat-insulating filler (120) for performing heat insulation on the steam sleeve in the reinforced concrete pipe trench (10), hoisting the reinforced concrete cover plate (50) to close the reinforced concrete pipe trench (10);

s60: and restoring the filling soil around the installation groove and completing the repair of the road structure layer on the upper side of the installation groove.

2. The construction method of a steam buried pipe structure according to claim 1, wherein the step S10 specifically includes the steps of:

firstly, excavating a foundation trench extending along the steam conveying direction on the ground according to a construction design drawing;

then, carrying out compaction treatment on the basic groove to enable the basic groove to reach the bearing capacity specified by design;

and finally, constructing a concrete cushion layer (60) extending along the length direction of the foundation trench on the trench bottom plate of the foundation trench to obtain the installation trench.

3. The construction method of a steam buried pipe structure according to claim 1, wherein the supporting pedestal (40) comprises a supporting platform (41) fixedly supported on the bottom plate (11), a connecting steel plate (42) laid on the top of the supporting platform (41), and a connecting steel bar pre-buried in the supporting platform (41) and connected with the connecting steel plate (42);

the construction of the reinforced concrete trench (10) and the support pedestal (40) in the step S20 includes the following steps:

binding steel bars at three design positions of the bottom plate (11), the side wall (12) and the end wall (13) on the groove bottom plate of the installation groove, and binding the steel bars of the supporting platform (41) on the binding steel bars of the bottom plate (11);

and carrying out mould planting pouring on the bottom plate (11), the side wall (12), the end wall (13) and the supporting platform (41) on binding steel bars, and pre-burying the connecting steel plate (42) and the connecting steel bars in the supporting platform (41) before pouring of the supporting platform (41).

4. The steam underground pipe structure construction method according to claim 1,

the pipe-penetrating ditch sleeve (20) comprises a hollow cylindrical pipe-penetrating through pipe (21) which is embedded in the end wall (13), a first annular baffle (22) which is sleeved on the excircle of the pipe-penetrating through pipe (21), and a first reinforcing rib plate (23) which is used for connecting and supporting the first annular baffle (22) and the pipe-penetrating through pipe (21);

the optical fiber sleeve (30) comprises an optical fiber through pipe (31) which is embedded in the end wall (13) and is in a hollow tubular shape and a water stop ring sleeved on the outer circle of the optical fiber through pipe (31), the optical fiber through pipe (31) is located above the through pipe (21), one end of the optical fiber through pipe (31) extends out of the end wall (13) and then extends into the reinforced concrete pipe ditch (10), and the other end of the optical fiber through pipe (31) extends out of the end wall (13) and then extends out of the ground.

5. The steam underground pipe structure construction method according to claim 1,

the reinforced concrete cover plate (50) comprises a plurality of concrete cover plate pieces (51);

and hanging rings (52) for hoisting are pre-buried at two ends of each concrete cover plate piece (51) when each concrete cover plate piece (51) is prefabricated.

6. The construction method of a steam buried pipe structure according to claim 1, wherein the step S30 specifically includes the steps of:

s31: customizing the fixing support (70), the guide support (80) and the steam sleeve section (90) according to a design drawing;

s33: after the fixing support (70), the guide support (80) and the steam casing section (90) are hoisted in place according to a construction design drawing, respectively welding and fixing the fixing support (70) and the correspondingly arranged supporting pedestal (40) and the steam casing section (90), and welding and fixing the guide support (80) and the correspondingly arranged steam casing section (90);

s34: welding adjacent said steam jacket sections (90);

s36: and carrying out rust removal and corrosion prevention treatment on the fixed support (70), the guide support (80) and the steam sleeve.

7. The steam underground pipe structure construction method according to claim 6,

after the step S31 is completed, and before the step S33 is performed, the method further includes a step S32:

waterproof sleeves (110) are respectively arranged on the outer circles of the steam sleeve sections (90) positioned at the two ends of the steam sleeve;

after the step S34 is completed, and before the step S36 is performed, the method further includes a step S35:

respectively welding and fixing the waterproof casing (110) with the pipe-penetrating groove casing (20) and the steam casing section (90) which are correspondingly arranged;

in the step S36, the method further includes performing rust removal and corrosion prevention treatment on the waterproof casing (110).

8. The steam underground pipe structure construction method according to claim 6,

the steam casing section (90) comprises a steam pipe (91) for conveying steam, an outer casing (92) sleeved outside the steam pipe (91), a second heat-insulating filler (93) filled between the steam pipe (91) and the outer casing (92), a heat-insulating support (94) arranged between the steam pipe (91) and the outer casing (92) and used for supporting the steam pipe (91), and temporary supports arranged at two ends of the steam pipe (91) and used for temporarily supporting the steam pipe (91);

the temporary support is fixed with the outer sleeve (92), and the steam pipe (91) is surrounded and fixed by the temporary support through a hoop of the temporary support.

9. The method for constructing a steam underground pipe structure according to claim 8, wherein the step S34 specifically includes the steps of:

welding the steam tubes (91) of adjacent steam casing sections (90);

dismantling the temporary support between the connected steam pipes (91), and carrying out rust removal and paint brushing treatment on the welded junctions and the peripheries between the connected steam pipes (91);

performing heat-insulating filler joint coating operation on the second heat-insulating filler (93) on the periphery of the connected steam pipe (91);

and welding and connecting the outer sleeve (92) corresponding to the connected steam pipe (91).

10. The method of constructing a steam buried pipe structure according to claim 1, further comprising, after the completion of the step S40 and before the step S60, the steps of:

s50: and integrally performing waterproof treatment on the periphery of the reinforced concrete pipe trench (10) and the reinforced concrete cover plate (50), and filling waterproof filler (130) between the pipe trench bushing (20) and the steam bushing.