CN107842035B - Ultra-high performance concrete prefabricated assembled comprehensive pipe gallery system and construction method - Google Patents
Ultra-high performance concrete prefabricated assembled comprehensive pipe gallery system and construction method Download PDFInfo
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- CN107842035B CN107842035B CN201711194220.2A CN201711194220A CN107842035B CN 107842035 B CN107842035 B CN 107842035B CN 201711194220 A CN201711194220 A CN 201711194220A CN 107842035 B CN107842035 B CN 107842035B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/10—Tunnels or galleries specially adapted to house conduits, e.g. oil pipe-lines, sewer pipes ; Making conduits in situ, e.g. of concrete ; Casings, i.e. manhole shafts, access or inspection chambers or coverings of boreholes or narrow wells
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/16—Arrangement or construction of joints in foundation structures
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Abstract
An ultra-high performance concrete prefabricated assembled comprehensive pipe gallery system is formed by assembling a plurality of prefabricated sections, wherein the prefabricated sections are made of ultra-high performance concrete and consist of side plates, a bottom plate, a top plate and partition plates; the clapboard is fixed between the bottom plate and the top plate; and adjacent prefabricated sections are overlapped through the ultra-high performance concrete patch. The invention also discloses a construction method of the pipe gallery system. The prefabricated segment of the comprehensive pipe rack system is made of materials such as high-strength, high-toughness and high-durability ultra-high-performance concrete and is combined with structures such as ultra-high-performance concrete patches, the rigidity, the bearing capacity and the waterproof performance of the pipe rack are improved, the wall thickness of the prefabricated segment is reduced compared with that of a traditional pipe rack system, the self weight of the pipe rack is obviously reduced, and the transportation and the hoisting are convenient; the material consumption of the pipe gallery is as low as 50% of that of the traditional pipe gallery system, and the comprehensive production cost is correspondingly reduced by 10 to 50%; the rigidity is big, is applicable to the relatively poor area of ground geological conditions, and the construction cycle of piping lane system is short, and is little to the influence of construction environment.
Description
Technical Field
The invention relates to equipment for municipal facility construction, in particular to an ultrahigh-performance concrete prefabricated assembled comprehensive pipe gallery system and a construction method.
Background
The utility tunnel is a tunnel space constructed under the municipal road, various engineering pipelines such as water supply and drainage, heating power, gas, electric power, communication, broadcasting and TV are summarized, and facilities such as special access hole, dog-house are arranged, so that unified construction management is realized, independent structures and earth excavation of the pipelines are omitted, and urban space resources can be effectively and intensively utilized. Its advantage does: excavation is carried out once, centralized construction is carried out, and repeated excavation of the same road section is avoided; the maintenance and the overhaul of municipal pipelines such as electric power, communication, gas, water supply and drainage and the like are greatly facilitated, the cost for repeatedly repairing the road surface and the maintenance cost of engineering pipelines are reduced, and the integrity of the road surface and the durability of various pipelines are maintained; the number of the posts of the road and the inspection wells, rooms and the like of various pipelines is reduced, and the beautiful effect of the city is improved; the pipeline arrangement in the utility tunnel is compact and reasonable, the underground space is effectively utilized, and the urban land is saved.
At present, most of the built or under-built underground comprehensive pipe galleries are common concrete cast-in-place or common concrete prefabricated assembled pipe galleries.
The partially prefabricated assembled steel concrete combined underground comprehensive pipe gallery disclosed in CN 106381886A is characterized in that the inner layer of the pipe gallery is a steel framework, the middle layer of the pipe gallery is a prefabricated steel plate layer, the outer layer of the pipe gallery is a cast-in-place concrete layer, the whole pipe gallery is placed on a cushion layer, the cast-in-place concrete layer is poured on the outer side of the prefabricated steel plate layer, the inner side of the prefabricated steel plate layer is connected with the steel framework, the steel framework is composed of annular steel beams and longitudinal steel beams, the annular steel beams are composed of horizontal ring beams and vertical ring beams, and the horizontal ring beams and the vertical ring beams are connected through splicing nodes. The combined underground comprehensive pipe gallery adopts cast-in-place common concrete, has the defects of high construction difficulty, large workload, low efficiency, long period and great influence by site conditions, and has high dependence on skilled work species, high cost and difficult control on quality and progress in the engineering implementation process. As the utility tunnel used as underground engineering has high requirements on durability, but the durability of common concrete is poorer than that of ultra-high performance concrete, and the steel collision easily generates sparks, so that the utility tunnel cannot be applied to a gas pipe gallery, and the steel is easy to corrode and has large welding workload.
CN 106351258A a steel concrete combination utility tunnel is assembled in full prefabrication, this piping lane includes a plurality of prefabricated segments, prefabricated segment inlayer is the steel skeleton, and the intermediate level is the steel deck, and the skin is concrete layer, be equipped with the steel sheet of concatenation in the steel deck, the steel skeleton comprises hoop girder steel and vertical girder steel, vertical girder steel connects into the vestibule form wholly with many tatami hoop girder steel in the prefabricated segment, forms the steel skeleton of space form, and the intraformational steel sheet rigid coupling of steel sheet is in the surface of hoop girder steel and vertical girder steel, be equipped with the indulging in advance among the concrete layer, horizontal reinforcing bar, and reserve stretch-draw pore and the anchor end of prestressing force cable in the concrete layer, each prefabricated segment is placed on the bed course, prestressing force cable passes stretch-draw pore stretch-draw cable to through the ground tackle with prestressing force cable anchor in the anchor end. This combination utility tunnel exists unit length from great, and transportation, hoist and mount difficulty, segment length are short, and the seam is many, and construction cost is high not enough.
Ultra-High Performance Concrete (UHPC) is considered as the most innovative cement-based engineering material in the last thirty years and is a novel Concrete with Ultra-High strength, ultra-High toughness and High durability. DSP (Densified Systems Containing uniformly distributed ultrafine particle compact system) prepared by adding silica fume, quartz powder, expanding agent and nano SiO into cement 2 The prepared high-performance grouting material has the advantages of early strength, high fluidity, micro-expansion and no bleeding, is simple to prepare, and can be directly used for field construction.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the prefabricated ultrahigh-performance concrete comprehensive pipe gallery system is suitable for zones with poor foundation geological conditions, has fewer seams compared with common concrete prefabricated pipe galleries, and is good in waterproofness, high in durability and improved in comprehensive economic index.
The technical scheme adopted by the invention for solving the technical problem is as follows:
the utility model provides a utility tunnel system is assembled in prefabrication of ultra high performance concrete, is assembled by a plurality of prefabricated segment and forms, prefabricated segment is by ultra high performance concrete preparation, prefabricated segment comprises curb plate, bottom plate, roof and baffle, and adjacent prefabricated segment connects notch and overlaps with the ultra high performance concrete paster.
Further, the prefabricated sections are prefabricated in a factory or on the site, the length of each prefabricated section is 1.0-4.5 m, and the inner sides of the side plates, the bottom plate and the top plate are in a waffle plate structure consisting of longitudinal ribs, transverse ribs and plates; the thickness of the side plate is 0.05m to 0.45m, the thickness of the top plate is 0.05m to 0.45m, the thickness of the bottom plate is 0.10m to 0.45m, and the partition plate consists of transverse ribs and plates and is fixed between the bottom plate and the top plate; the thickness of the separator is 0.05m to 0.45m.
Furthermore, the longitudinal ribs and the transverse ribs are rectangular or wedge-shaped, the widths of the longitudinal ribs and the transverse ribs are 0.10m to 0.60m, the heights of the longitudinal ribs and the transverse ribs are 0.10m to 0.60m, and the distance between every two adjacent transverse ribs or between every two adjacent longitudinal ribs is 0.50m to 2.50m.
Furthermore, adjacent prefabricated segments are locked through a longitudinal prestressing device, the longitudinal prestressing device comprises prestressed tendon preformed holes, prestressed tensioning anchoring holes and prestressed tendons, the prestressed tendon preformed holes are formed in four corners of the prefabricated segments, the prestressed tensioning anchoring holes are formed in the middle of the joints of the bottom plates and the side plates in the prefabricated segments, and the prestressed tendons are used for connecting the prestressed tendon preformed holes and the prestressed tensioning anchoring holes; and setting 2~6 prefabricated sections in the pipe gallery system as a prestressed anchoring section, namely penetrating prestressed tendons into prestressed tendon preformed holes and performing prestressed tensioning and locking in the prestressed tensioning and anchoring holes.
Further, prefabricated segment still is equipped with the connection key, and the connection key includes shape assorted socket and bellmouth, and socket and bellmouth set up respectively on prefabricated segment butt joint face, establish socket and bellmouth on the preceding, the rear end face of curb plate and roof respectively promptly, and the use of connection key has improved the precision of assembling of piping lane, the more reasonable atress of interface that also guarantees simultaneously.
Further, a T-shaped notch is formed in the cast-in-place connecting section of the bottom plate, embedded steel bars are arranged on the T-shaped notch and wrapped by ultra-high performance concrete, and the thickness of the upper flange is 4-10cm.
Furthermore, common concrete is filled between the longitudinal ribs and the transverse ribs of the bottom plate, so that the bottom plate is flat.
Further, a bracket mounting hole is arranged on the transverse rib of the side plate and/or the partition plate.
Further, the top and side surfaces of the prefabricated segments are provided with connecting notches.
As a further improved technical scheme: and connecting notches of adjacent prefabricated segments are lapped by the ultrahigh-performance concrete patches from the upstream surface to the downstream surface through the DSP.
Further, the junction of ultra high performance concrete paster and piping lane connection notch all is equipped with the profile of tooth structure.
According to construction conditions, the width of the ultra-high performance concrete patch is 20-50cm, the thickness of the ultra-high performance concrete patch is 5-15cm, the ultra-high performance concrete patch is integrally formed or formed by splicing a plurality of pieces of the ultra-high performance concrete patch, a lap joint is arranged at the joint of the ultra-high performance concrete patch pieces, and preferably, the lap joint is L-shaped or W-shaped.
Further, the thickness of the DSP used for bonding the ultra-high performance concrete patch is 2 to 5cm.
The technical scheme adopted for further solving the technical problems is as follows:
a construction method of an ultrahigh-performance concrete prefabricated assembled comprehensive pipe gallery system comprises the following steps:
1) Preparing a prefabricated part: prefabricating the prefabricated sections in a factory or on site, arranging connecting keys and connecting notches of matched sockets and sockets at the butt ends of the two prefabricated sections to be connected, arranging pre-stressed tendon preformed holes at four corners of the prefabricated sections, and prefabricating an ultra-high performance concrete patch;
2) Excavation and supporting of a foundation pit: excavating a foundation pit by using excavating equipment, and supporting the excavated foundation pit;
3) Foundation treatment and cushion layer laying: leveling the foundation of the foundation pit dug in the step 2), constructing a cushion layer on the foundation, wherein construction joints and water collection wells are required to be arranged on the foundation and the cushion layer every 150m to 250m, and longitudinal slopes are required to be arranged at each distance;
4) Hoisting the prefabricated sections of the pipe gallery system: hoisting the prefabricated sections to the specified positions according to the numbers;
5) Tensioning the prestress until the prestress reaches a design value;
6) Filling ultrahigh-performance concrete into the bottom T-shaped groove openings of the adjacent prefabricated sections, and optionally sticking ultrahigh-performance concrete patches on the connecting groove openings of the prefabricated sections by using a DSP (digital signal processor);
7) Waterproof experiment of piping lane: selecting partial segments and carrying out a waterproof test;
8) Soil body backfilling: backfilling and tamping in layers according to requirements, wherein the layering thickness is 0.3-0.5 m, the soil filled at two sides is tamped by a small tamping machine or manpower, and the soil filled at the top layer is tamped by machinery according to conditions.
The invention discloses an ultrahigh-performance concrete prefabricated assembled comprehensive pipe gallery system, which has the beneficial effects that:
the prefabricated sections of the comprehensive pipe gallery system are made of high-strength, high-toughness and high-durability ultrahigh-performance concrete and other materials, so that the rigidity, the bearing capacity and the waterproof performance of the pipe gallery are improved, the wall thickness of the prefabricated sections is lower than that of the traditional pipe gallery system, the dead weight of the pipe gallery is obviously reduced, and the transportation and the hoisting are convenient;
the consumption of the steel bars is reduced, so that the construction quality problem caused by the processes of welding, binding and the like of the steel bars is reduced; the construction process is simple and convenient, the material consumption of the pipe gallery is as low as 50% of that of the traditional pipe gallery system, and the comprehensive production cost of the pipe gallery is correspondingly reduced by 10 to 50%;
the prefabricated sections of the pipe gallery are longitudinally fixed and locked by prestress, the ultrahigh-performance concrete flitch is attached by DSP and filled by UHPC after being tensioned and prestressed, the self weight is light, the requirement on the bearing capacity of the foundation is lower than that of a common concrete comprehensive pipe gallery, and the pipe gallery is suitable for zones with poorer foundation geological conditions.
The prefabricated segment connecting notches are bonded by adopting ultra-high performance concrete patches, the number of joints is less than that of a common concrete prefabricated pipe gallery, the waterproofness and the durability are good, the construction method is simple, and the economic index is improved.
The prefabricated sections of the pipe gallery system are integrally prefabricated in a factory and assembled on site, so that the construction period is greatly shortened, and the influence of site construction on the surrounding environment is reduced.
Drawings
FIG. 1 is a schematic perspective view of a single prefabricated section in an ultra-high performance concrete prefabricated assembled comprehensive pipe gallery system according to the present invention;
FIG. 2 is a front view of a single prefabricated section in the prefabricated assembled comprehensive pipe rack system of the ultra-high performance concrete of the invention;
FIG. 3 is a top view of a single prefabricated section in the ultra-high performance concrete prefabricated assembled comprehensive pipe gallery system of the present invention;
FIG. 4 is a schematic structural diagram of an ultra-high performance concrete prefabricated assembled comprehensive pipe gallery system (part) of the invention;
FIG. 5 isbase:Sub>A schematic cross-sectional view taken along line A-A of FIG. 4;
FIG. 6 is an exploded view of the ultra high performance concrete patch lap joint at B of FIG. 4;
FIG. 7 is an exploded view at C of FIG. 4;
FIG. 8 is an enlarged view of FIG. 5 at D;
FIG. 9 is an enlarged view of E in FIG. 5;
fig. 10 is a schematic structural diagram of the connecting keys in the single prefabricated sections in the ultra-high performance concrete prefabricated assembled comprehensive pipe gallery system.
Detailed Description
The invention is further explained with reference to the drawings and the embodiments.
Referring to FIGS. 1 to 10: the invention discloses an ultrahigh-performance concrete prefabricated assembled comprehensive pipe gallery system which is formed by assembling a plurality of prefabricated sections, wherein the prefabricated sections are made of ultrahigh-performance concrete, each prefabricated section consists of a side plate 2, a bottom plate 1, a top plate 6 and a partition plate 7, and connecting notches of adjacent prefabricated sections are lapped by ultrahigh-performance concrete patches 13.
The prefabricated sections are integrally prefabricated in a factory, the length of each prefabricated section is 1.0-4.5 m, and the inner sides of the side plates 2, the bottom plate 1 and the top plate 6 are in a waffle plate structure consisting of longitudinal ribs 9, transverse ribs 8 and plates; the thickness of the side plate 2 is 0.05m to 0.45m, the thickness of the top plate 6 is 0.05m to 0.45m, the thickness of the bottom plate 1 is 0.10m to 0.45m, and the partition plate 7 consists of transverse ribs 8 and plates and is fixed between the bottom plate 1 and the top plate 6; the thickness of the partition 7 is 0.05m to 0.45m.
The longitudinal ribs 9 and the transverse ribs 8 are rectangular or wedge-shaped, the width of each longitudinal rib 9 and each transverse rib 8 is 0.10m to 0.60m, the height of each longitudinal rib 9 and each transverse rib 8 is 0.10m to 0.60m, and the distance between every two adjacent transverse ribs 8 or the longitudinal ribs 9 is 0.50m to 2.50m.
The adjacent prefabricated segments are locked through a longitudinal prestressed device, the longitudinal prestressed device comprises prestressed tendon preformed holes 5, prestressed tension anchoring holes 17 and prestressed tendons, the prestressed tendon preformed holes 5 are formed in four corners of the prefabricated segments, the prestressed tension anchoring holes 17 are formed in the middle of the connecting portion of the bottom plate 1 and the side plate 2 in the prefabricated segments, the prestressed tendons are used for connecting the prestressed tendon preformed holes 5 and the prestressed tension anchoring holes 17, each 2~6 prefabricated segments in a pipe gallery system are set to be one prestressed anchoring section, namely the prestressed tendons penetrate into the prestressed tendon preformed holes 5, and prestressed tension locking is conducted in the prestressed tension anchoring holes 17.
Prefabricated segment still is equipped with the connector key, and the connector key includes shape assorted socket 4 and bellmouth 12, and socket 4 and bellmouth 12 set up respectively on prefabricated segment butt joint face, establish socket 4 and bellmouth 12 on the preceding, the rear end face of curb plate 2 and roof 6 respectively promptly, and the connector key has improved the precision of assembling of piping lane, and the interface atress that also guarantees simultaneously is more reasonable.
A T-shaped notch 16 is formed in the cast-in-place connecting section of the bottom plate 1, embedded steel bars 10 are arranged in the T-shaped notch 16, the embedded steel bars 10 are wrapped by ultra-high performance concrete, and the thickness of an upper flange is 4-10cm.
Ordinary concrete is filled between the longitudinal ribs 9 and the transverse ribs 8 of the bottom plate 1, so that the bottom plate 1 is flat.
The transverse ribs 8 of the side plates 2 and/or the partition plates 7 are provided with bracket mounting holes 3.
The top and side surfaces of the prefabricated segments are provided with connection notches 11.
The connection notches 11 of adjacent prefabricated segments are overlapped from the upstream surface to the downstream surface by the ultra-high performance concrete patch 13 through the DSP.
The joints of the ultra-high performance concrete patches 13 and the connecting notches 11 of the prefabricated segments are provided with tooth-shaped structures 14.
According to construction conditions, the width of the ultra-high performance concrete patch 13 is 20 to 50cm, the thickness of the ultra-high performance concrete patch is 10cm, the ultra-high performance concrete patch 13 is integrally formed into a whole piece or is formed by splicing a plurality of pieces of the ultra-high performance concrete patch, a lap joint 15 is arranged at the joint of the pieces of the ultra-high performance concrete patch 13, and the lap joint is L-shaped.
The thickness of the DSP used for bonding the ultra-high performance concrete patch 13 is 2 to 5cm.
The technical scheme adopted for further solving the technical problems is as follows:
a construction method of an ultra-high performance concrete prefabricated assembled comprehensive pipe gallery system comprises the following steps:
1) Preparing a prefabricated part: prefabricating the prefabricated sections in a factory or on site, arranging connecting keys of a socket 12 and a socket 4 and connecting notches 11 which are matched with each other at the butt joint ends of the two prefabricated sections to be connected, arranging prestressed tendon preformed holes 5 at four corners of the prefabricated sections, and prefabricating an ultra-high performance concrete patch 13;
2) Excavation and supporting of a foundation pit: excavating a foundation pit by using excavating equipment, and supporting the excavated foundation pit;
3) Foundation treatment and cushion layer laying: leveling the foundation of the foundation pit dug in the step 2), constructing a cushion layer on the foundation, wherein construction joints and water collection wells are required to be arranged on the foundation and the cushion layer every 150m to 250m, and longitudinal slopes are required to be arranged at each distance;
4) Hoisting the prefabricated sections of the pipe gallery system: hoisting the prefabricated sections to the specified positions according to the numbers;
5) Tensioning prestress until the tension reaches a design value: prestress tensioning and locking are carried out on 2~6 prefabricated sections in the pipe gallery system through a prestress rib which is connected with the prestress rib preformed hole 5 and the prestress tensioning and anchoring hole 17;
6) Filling ultrahigh-performance concrete into the bottom T-shaped notch 16 of the adjacent prefabricated section, and optionally sticking an ultrahigh-performance concrete patch 13 on the connecting notch 11 of the prefabricated section by using a DSP (digital signal processor);
7) Waterproof experiment of piping lane: selecting partial segments and carrying out a waterproof test;
8) Soil body backfilling: backfilling and tamping in layers according to requirements, wherein the layering thickness is 0.3-0.5 m, the soil filled at two sides is tamped by a small tamping machine or manpower, and the soil filled at the top layer is tamped by machinery according to conditions.
According to the ultra-high performance concrete prefabricated assembled comprehensive pipe gallery system, the thicknesses of the bottom plate, the side plates and the top plate are adjusted according to mechanical parameters such as rigidity and strength required by the pipe gallery system, so that the embodiment part is not limited one by one, the technical characteristics are changed, and a person skilled in the art can understand and implement the system through text description, so that the system is not illustrated in the attached drawings.
Claims (7)
1. The prefabricated assembled comprehensive pipe gallery system of the ultra-high performance concrete is characterized by being formed by assembling a plurality of prefabricated sections, wherein the prefabricated sections are made of the ultra-high performance concrete, each prefabricated section consists of a side plate, a bottom plate, a top plate and a partition plate, and adjacent prefabricated sections are overlapped through ultra-high performance concrete patches; connecting notches are formed in the top surface and the side surface of each prefabricated segment, the connecting notches of adjacent prefabricated segments are overlapped from the upstream surface to the downstream surface through the ultra-high performance concrete patches for the DSP, and tooth-shaped structures are arranged at the joints of the ultra-high performance concrete patches and the connecting notches; the width of the ultra-high performance concrete patch is 20 to 50cm, the thickness of the ultra-high performance concrete patch is 5 to 15cm, the ultra-high performance concrete patch is an integrally formed whole piece or is formed by splicing a plurality of pieces of the ultra-high performance concrete patch, and a lap joint is arranged at the joint of the pieces of the ultra-high performance concrete patch; the thickness of the DSP used for bonding the ultra-high performance concrete patch is 2 to 5cm; the lap joint is L-shaped or W-shaped.
2. The ultra-high performance concrete prefabricated assembled comprehensive pipe gallery system as claimed in claim 1, wherein the prefabricated sections are prefabricated in a factory or on site, the length of the prefabricated sections is 1.0m to 4.5m, and the inner sides of the side plates, the bottom plate and the top plate are in a waffle plate structure consisting of longitudinal ribs, transverse ribs and plates; the thickness of the side plate is 0.05m to 0.45m, the thickness of the top plate is 0.05m to 0.45m, and the thickness of the bottom plate is 0.10m to 0.45m; the partition plate is composed of transverse ribs and plates and is fixed between the bottom plate and the top plate, and the thickness of the partition plate is 0.05m to 0.45m.
3. The ultrahigh-performance concrete prefabricated assembly comprehensive pipe gallery system as claimed in claim 2, wherein the longitudinal ribs and the transverse ribs are rectangular or wedge-shaped, the widths of the longitudinal ribs and the transverse ribs are 0.10m to 0.60m, the heights of the longitudinal ribs and the transverse ribs are 0.10m to 0.60m, and the distance between every two adjacent transverse ribs or between every two adjacent longitudinal ribs is 0.50m to 2.50m; and common concrete is filled between the longitudinal ribs and the transverse ribs of the bottom plate, so that the bottom plate is flat.
4. The prefabricated assembled comprehensive pipe gallery system of ultra-high performance concrete as claimed in claim 1 or 2, wherein adjacent prefabricated sections are locked by longitudinal prestressing devices, each longitudinal prestressing device comprises a prestressed tendon preformed hole, prestressed tension anchoring holes and prestressed tendons, the prestressed tendon preformed holes are formed in four corners of the prefabricated section, the prestressed tension anchoring holes are formed in the middle of the joint of the bottom plate and the side plate in the prefabricated section, each 2~6 prefabricated sections in the pipe gallery system are arranged to be a prestressed anchoring section, namely, prestressed tendons are used for penetrating the prestressed tendon preformed holes, and the prestressed tension locking is carried out in the prestressed tension anchoring holes.
5. The prefabricated assembled comprehensive pipe gallery system of ultra-high performance concrete as claimed in claim 1 or 2, wherein the prefabricated sections are further provided with connecting keys, the connecting keys comprise sockets and sockets with matched shapes, and the sockets are respectively arranged on the butt joint surfaces of the prefabricated sections, namely the front end surfaces and the rear end surfaces of the side plates and the top plate are respectively provided with the sockets and the sockets.
6. The prefabricated and assembled comprehensive pipe gallery system of ultra-high performance concrete as claimed in claim 1 or 2, wherein the cast-in-place connecting section of the bottom plate is provided with a T-shaped notch, the T-shaped notch is provided with embedded steel bars, the embedded steel bars are wrapped by the ultra-high performance concrete, and the thickness of an upper flange of the cast-in-place section of the ultra-high performance concrete is 4-10cm; and the transverse ribs of the side plates are provided with bracket mounting holes.
7. A construction method of an ultra-high performance concrete prefabricated assembled comprehensive pipe gallery system comprises the following steps:
1) Preparing a prefabricated part: prefabricating in a factory or on site a prefabricated segment and a prefabricated ultra high performance concrete patch according to any one of claims 1~6;
2) Excavation and supporting of a foundation pit: excavating a foundation pit by using excavating equipment, and supporting the excavated foundation pit;
3) Foundation treatment and cushion layer laying: leveling the foundation of the foundation pit dug in the step 2), constructing a cushion layer on the foundation, wherein construction joints and water collection wells are required to be arranged on the foundation and the cushion layer every 150m to 250m, and longitudinal slopes are required to be arranged at each distance;
4) Hoisting the prefabricated sections of the pipe gallery system: hoisting the prefabricated section to a specified position;
5) Tensioning the prestress until the prestress reaches a design value;
6) Filling ultrahigh-performance concrete into the bottom T-shaped groove openings of the adjacent prefabricated sections, and sticking ultrahigh-performance concrete patches on the connecting groove openings of the prefabricated sections by using a DSP (digital signal processor);
7) Performing a pipe gallery waterproof experiment;
8) And (6) soil body backfilling.
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| CN107842035B true CN107842035B (en) | 2023-03-17 |
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