CN212225242U - Detachable light steel-UHPC combined shield segment - Google Patents
Detachable light steel-UHPC combined shield segment Download PDFInfo
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- CN212225242U CN212225242U CN202020632465.XU CN202020632465U CN212225242U CN 212225242 U CN212225242 U CN 212225242U CN 202020632465 U CN202020632465 U CN 202020632465U CN 212225242 U CN212225242 U CN 212225242U
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Abstract
The utility model relates to a light-duty steel of detachable-UHPC combination shield constructs section of jurisdiction and belongs to tunnel shield method construction technical field. Including inlayer steel-pipe section and outer super high strength concrete section of jurisdiction, the inlayer section of jurisdiction comprises arc side steel sheet, end steel sheet, stiffening rib, the light-duty steel backplate of arc, is equipped with the connecting bolt hole on arc side steel sheet, the end steel sheet, and the light-duty steel backplate of arc is equipped with radial toggle pin outward, and outer UHPC section of jurisdiction has the super high strength concrete arc of certain thickness for pouring in light-duty steel backplate toggle pin one side of arc. A plurality of shield segments are connected into a ring shape through end steel plate bolts, connected into a shield tunnel through side steel plate bolts, and provided with rubber sheet sealing water stops with triangular heads at seams. The utility model discloses a showing the characteristics and being connected through the dowel with outer UHPC section of jurisdiction in inlayer steel pipe piece, forming steel and UHPC's integrated configuration, resisting outer load jointly, through straight bolted connection between the section of jurisdiction, can dismantle, have that intensity is high, rigidity is big, the dead weight is light, loading and unloading are convenient and repeatedly usable's advantage.
Description
Technical Field
The utility model relates to a subway, highway tunnel construction technical field, concretely relates to light gauge steel-UHPC combination shield of detachable constructs section of jurisdiction.
Background
The shield method is a construction method for forming a tunnel structure by excavating in a soil layer by using a shield machine, excavating while excavating, and then splicing and supporting prefabricated lining segments in an excavated space.
The existing shield segment is mainly of an arc-shaped plate structure consisting of reinforcing steel bars and common concrete, the thickness of the shield segment reaches 300-350 mm, the weight of a single segment reaches more than 3 tons, the self weight is large, and the common concrete has low tensile strength, so that concrete at hand holes and corners is damaged in the transportation and installation processes; in the operation process, structural cracks are easy to appear under the action of load, water seepage and other diseases are caused, and hidden dangers are caused to the safety and the durability of the tunnel.
On the other hand, traditional prefabricated reinforced concrete section of jurisdiction is generally through dismantling the big fixed mode concatenation of the degree of difficulty (if set up the connecting hole of arcuation on prefabricated reinforced concrete section of jurisdiction, adjacent prefabricated reinforced concrete section of jurisdiction passes the connecting hole of adjacent prefabricated reinforced concrete section of jurisdiction through the bending bolt in order to accomplish the concatenation), make when needs are dismantled (if meet the station position in the subway construction, the normal way is that the shield constructs the quick-witted normal tunnelling, install the shield section of jurisdiction earlier in the station scope, let the shield tunnel pass the station in succession, when the construction of station underground building structure, the tunnel lining section of jurisdiction that has installed in this scope need be dismantled, dismantle the abandonment mode after the difficulty or adopt direct damage, cause considerable wasting of resources.
SUMMERY OF THE UTILITY MODEL
In order to overcome the not enough of prior art, the utility model provides a light-duty steel of detachable-UHPC combination shield constructs section of jurisdiction, this shield constructs that the section of jurisdiction dead weight is light, tensile, compressive strength are high, and can overcome current shield and construct the technical problem that the section of jurisdiction dismantles difficultly, unable reuse.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a detachable light steel-UHPC combined shield segment is characterized by comprising an inner layer steel segment and an outer layer ultra-high strength concrete segment;
the inner steel sub-pipe comprises an arc-shaped steel back plate, side plates arranged on two sides of the steel back plate and end plates arranged at two ends of the light steel back plate;
the convex outer surface of the arc-shaped steel back plate is provided with a connecting piece, and the outer-layer ultrahigh-strength concrete duct piece is tightly attached to the steel back plate through the connecting piece;
connecting holes are respectively formed in the side plates and the end plates, and adjacent detachable light steel-UHPC combined shield segments are connected with the connecting holes in a penetrating mode through fasteners to achieve splicing connection.
Preferably, a plurality of stiffening ribs are arranged between the two side plates at intervals.
Preferably, the stiffening ribs are square steel pipes.
Preferably, the side plates and the end plates are steel plates.
Preferably, a water stop sheet is arranged between the adjacent detachable light steel-UHPC combined shield segments.
Preferably, one end of the water stop sheet is thickened, and the thickened end of the water stop sheet is flush with the upper surface of the outer-layer ultrahigh-strength concrete segment.
Preferably, the connecting member is a stud which is arranged on the steel back plate and points outwards.
Preferably, the fastener is a bolt.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses utilize two kinds of materials of steel and ultra high performance concrete high strength, the mechanical properties advantage of high tenacity (steel tensile, compressive strength can reach more than 280MPa, and the tensile strength of UHPC material is 5 ~ 10MPa, and compressive strength can reach 150MPa), combine together steel and UHPC, connect through the dowel and reach whole atress, form steel-UHPC integrated configuration's novel shield structure section of jurisdiction. Compared with the shield segment of the existing reinforced concrete plate type structure, the novel steel-UHPC combined structure segment can fully exert the advantages of two materials, and the strength and the rigidity of the segment can be greatly improved; under the same stress condition, the ultra-high performance concrete segment of the embodiment is thinner, so that the dead weight of the segment is reduced, and the high strength and light weight of the segment are realized; the technical problems that the tensile strength of a UHPC material is higher than that of common concrete (about 4 times or more) and the common concrete is not easy to crack are solved, and the defects of water seepage and the like are caused due to the fact that the common concrete pipe piece is low in tensile strength.
Furthermore, the utility model is provided with connecting holes on the end plate and the side plate of the inner steel pipe sheet layer, so that when the segments are spliced, the end plates or the side plates of the adjacent light steel-UHPC combined shield segments are close to each other, and then the splicing between the shield segments can be realized through the penetration of the fasteners on the opposite connecting holes; the fastener can select to dismantle convenient connecting piece such as straight bolt, and then makes the concatenation convenient with the dismantlement section of jurisdiction, and when needs are dismantled, need not damaged shield and constructs the section of jurisdiction, only needs to loosen the fastener, can dismantle fast, and then guarantees that the shield of dismantling constructs the section of jurisdiction and keeps integrality to recycle, resources are saved.
Drawings
The present invention will now be further described with reference to the accompanying drawings and specific embodiments:
fig. 1 is a schematic structural view of a duct piece of the present invention;
fig. 2 is the utility model discloses a seam schematic diagram is assembled to section of jurisdiction.
In the figure:
1. the concrete sealing plate comprises side plates, 2, end plates, 3, stiffening ribs, 4, a back plate, 5, studs, 6, connecting holes, 7, outer-layer ultrahigh-strength concrete segment, 8, bolts, 9 and water stop sheets.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.
Example one
As shown in fig. 1-2, the present embodiment discloses a detachable light steel-UHPC (Ultra-High Performance Concrete, UHPC for short) combined shield segment, which is characterized by comprising an inner steel sub-segment and an outer Ultra-High strength Concrete sub-segment 7, wherein the inner steel sub-segment comprises an arc-shaped steel back plate 4, a connecting member is arranged on a convex outer surface of the steel back plate 4, and the outer Ultra-High strength Concrete sub-segment 7 is closely attached to the steel back plate 4 through the connecting member.
In this embodiment, the outer layer ultrahigh-strength concrete segment 7 is an outer layer ultrahigh-strength concrete segment layer.
The existing shield segment is a curved plate-shaped structure composed of steel bars and common concrete, a steel bar framework is generally bound, then concrete (commonly C50 concrete) is poured, and the shield segment is cured and formed under standard conditions. According to the existing design Specification of concrete structures (GB50010-2010), the designed value of the compressive strength of C50 concrete is 23.1MPa, and the value of the tensile strength is 1.89 MPa; the compression strength design value of the commonly used HRB335 grade steel bar is 280MPa, and the tensile strength design value is 280 MPa; the shield segment is easy to crack and damage in the transportation and installation process due to the lower strength of the common concrete of the shield segment; in the operation process, micro cracks are easy to generate to cause water seepage and water leakage of the segments under the action of load, and the existing design specification takes the width of the cracks as a control target, and more reinforcing steel bars are configured, so that the traditional reinforced concrete shield segments are thicker and heavier.
The shield segment of this embodiment utilizes the mechanical properties that steel is high-strength (tensile, compressive strength design value of Q345 steel is 295MPa) (GB50017-2017) and the superhigh strength of ultra high performance concrete (tensile strength is 5 ~ 10MPa, compressive strength can reach 150MPa), combines together steel and UHPC, reaches whole atress through the stud connection, forms the novel shield segment of steel-UHPC integrated configuration. Compared with the shield segment with the existing reinforced concrete plate type structure, the novel steel-UHPC combined structure segment can fully exert the mechanical property advantages of high strength and high toughness of two materials, so that the integral bearing capacity is greatly improved, and the integral rigidity of the segment is large and the deformation is small. Under the same load bearing condition, the ultra-high performance concrete segment (namely the ultra-high performance concrete layer) of this embodiment is thinner, and then lightens the dead weight of segment for the segment of this embodiment realizes excelling in, the lightweight. The weight of the segment of this embodiment is about 2/3 for a conventional segment, i.e., the weight of the segment of this embodiment is reduced by about 30% as compared to a ring of conventional shield tunnel segments of the same diameter and length. The light segment has low requirement on the lifting capacity of construction machinery, and further reduces the construction cost. The tensile strength of the UHPC material in the embodiment is more than 4 times that of the existing common concrete material of the duct piece, and the compressive strength is 2-3 times that of the common concrete, so that the duct piece is not easy to damage and crack in the transportation, installation and operation processes, and is more favorable for the safety and durability of the shield tunnel.
In this embodiment, the inner steel sub-pipe sheet further includes side plates 1 disposed at both sides of the steel back plate 4 and end plates 2 disposed at both ends of the steel back plate 4; connecting holes 6 are respectively arranged on the side plates 1 and the end plates 2, and adjacent steel-UHPC combined shield segments are connected with each other in a penetrating manner through the connecting holes 6 through fasteners to realize assembly connection.
In the embodiment, a plurality of stiffening ribs 3 are arranged between the two side plates 1 at intervals, and the stiffening ribs 3 are square steel pipes; the light steel back plate 4, the side plates 1 and the end plates 2 are steel plates.
Traditional prefabricated reinforced concrete section of jurisdiction is generally through demolising the big fixed mode concatenation of the degree of difficulty (if set up the connecting hole of arcuation on prefabricated reinforced concrete section of jurisdiction, adjacent prefabricated reinforced concrete section of jurisdiction passes the connecting hole of adjacent prefabricated reinforced concrete section of jurisdiction through bending bolt in order to accomplish the concatenation), when making need demolish (if meet the station position in the subway construction, the normal way is that the shield constructs the quick-witted normal tunnelling, install the shield section of jurisdiction earlier in the station within range, let the shield tunnel pass the station in succession, when the construction of station underground building structure, need demolish the tunnel lining section of jurisdiction that has installed in this scope, demolish the abandonment mode after the difficulty or adopt direct damage, cause considerable wasting of resources.
In the embodiment, the end plates 2 pointing to the axis of the light steel back plate 4 are arranged at the two ends of the steel back plate 4, the side plates 1 are arranged on the two sides of the steel back plate 4, and the connecting holes 6 are formed in the end plates 2 and the side plates 1, so that when the shield segments are spliced, the end plates 2 or the side plates 1 of adjacent steel-UHPC combined shield segments abut against each other, and then the shield segments can be spliced through the penetration of the fasteners on the opposite connecting holes 6. Because end plate 2 and curb plate 1 have enough spaces in the section of jurisdiction inboard for the fastener can select to dismantle convenient connecting piece such as straight bolt 8, and then makes the concatenation with dismantle the section of jurisdiction convenient, and when dismantling, need not damaged shield and construct the section of jurisdiction and can dismantle fast, and then guarantee that the shield of dismantling constructs the section of jurisdiction and keep integrality, with cyclic utilization, resources are saved. Be straight bolt 8 if the fastener, be about to bolt 8 pass behind the relative connecting hole 6 with nut fastening connection, can accomplish the concatenation of section of jurisdiction, unscrew the nut and take out bolt 8 during the dismantlement, can accomplish the separation of section of jurisdiction, can not cause the damage.
A plurality of detachable light steel-UHPC combined shield segments of the embodiment are connected through bolts 8 between end plates 2 at two ends to form a ring of shield segments; a plurality of ring shield constructs the section of jurisdiction, along the line axis direction, through 8 hole stagger joints concatenations of the bolt on the side steel sheet, forms the shield tunnel.
In the embodiment, a water stop sheet 9 is arranged between adjacent steel-UHPC combined shield segments; the one end thickening setting of stagnant water piece 9, the one end of the stagnant water piece 9 of thickening flushes with the upper surface of outer ultrahigh strength concrete section of jurisdiction 7. Namely, a water stop sheet 9 is clamped at the joint of adjacent combined shield segments, one end of the water stop sheet 9 is thickened, and one end of the thickened water stop sheet 9 is flush with the outer side surface of the ultra-high strength concrete layer; further, the water stop sheet 9 is a tapered rubber water stop sheet 9.
In the embodiment, when the shield segments are connected by the bolts 8 between the end steel plates at the two ends to form a ring of shield segments, water stop strips with thickened ends are arranged between the segments to seal and stop water (namely, a ring water stop design); adjacent ring shield segments along the length direction of the tunnel are connected through bolts 8 between the steel side plates 1, and a water-swelling rubber water sheet with triangular heads (namely the water stop design in the axial direction and the length direction of the tunnel) is arranged between the two ring side plates 1.
In this embodiment, the connecting member is a stud 5 which is arranged on the steel back plate 4 and points outwards; the fastening piece is a bolt 8, preferably a straight bolt 8, and the straight bolt 8 penetrates through the water stop sheet 9.
In this embodiment, the studs 5 (or rivets) are vertically connected to the steel back plate 4; the studs 5 are welded on the outer surface of the steel back plate 4 at certain intervals to enhance the bonding strength of the ultra-high performance concrete layer and the steel back plate 4, so that the force is transmitted, and the purpose of integral stress is achieved.
In the embodiment, the studs 5 are embedded in the outer layer of the ultra-high performance concrete, the length of the studs is 10-15 mm shorter than that of the UHPC layer, and the distance between every two adjacent studs 5 is 100-200 mm.
When the bolt 8 penetrates through the opposite connecting holes 6 to tightly connect the adjacent bulges, the bolt also penetrates through the water stop sheet 9, so that water stop has downward tensile force, the effect of sealing gaps among the pipe pieces at one end of the thickened water stop sheet 9 is better, and the water stop is more effective; due to the ultrahigh strength of the ultrahigh-performance concrete layer, the ultrahigh-performance concrete layer has the characteristic of being not easy to crack, and further the ultrahigh-performance concrete layer is also a water stop barrier.
In the embodiment, the straight bolts 8 are loosened, namely adjacent segments are loosened, and in the segment removing process, the light steel back plate 4 and the ultra-high performance concrete layer are high in strength and rigidity, and are not easy to break and deform, so that the segments can be further recycled after being removed; the high strength and light weight of the duct piece also make the duct piece more convenient to install or remove; in other words, utilize straight bolt 8 to connect between the combination section of jurisdiction, the concatenation is convenient with the dismantlement, and when dismantling the section of jurisdiction, need not damaged section of jurisdiction and can dismantle fast, and then guarantees the integrality of section of jurisdiction to recycle, resources are saved. The combined structure of the ultra-high performance concrete layer, the light steel back plate 4, the end plate 2 and the side plate 1 resists external load together, and has the characteristics of high strength, high rigidity, light dead weight, convenience in loading and unloading, replaceability and reutilization.
In the embodiment, the bolt 8 is perpendicular to the end plate 2 when passing through the connecting hole 6 on the end plate 2; the bolt 8 is vertical to the side plate 1 when passing through the connecting hole 6 on the side plate 1; the side plates 1 are sequentially abutted with the end portions of the end plates 2.
In this embodiment, not less than 6 connecting holes 6 are arranged on the side plate 11 and the end plate 22 at intervals.
Example two
The embodiment discloses a preparation method of a shield segment, which comprises the following steps:
s1: the steel back plate 4, the side plate 1, the end plate 2, the stiffening ribs 3 and the connecting pieces are respectively subjected to blanking processing according to design drawings, connecting holes 6 are formed in the side plate 1 and the end plate 2 at certain intervals, and the steel back plate 4, the side plate 1, the end plate 2, the stiffening ribs 3 and the connecting pieces are spliced into inner-layer steel sub-segments;
s2: and the outer side of the steel back plate is welded with a stud.
S3: manufacturing a side template by taking the steel back plate 4 as a bottom template, and pouring an ultrahigh-performance concrete layer on the steel back plate 4;
s4: and maintaining the combined shield segment by high-temperature steam to form the combined shield segment.
In other words, the method for preparing the detachable light steel-UHPC combined shield segment disclosed in the first embodiment of the present invention includes the following steps:
step 1: firstly, preparing an inner layer steel pipe sheet. Arc side steel plate, end steel sheet, the square steel pipe of putting more energy into, arc steel backplate and 5 subassemblies of stud are based on the design drawing blanking processing respectively in the prefabricated field, weld each subassembly into inlayer steel-pipe piece.
Step 2: outer UHPC pipe pieces were prepared. And (3) taking the arc-shaped steel back plate as a bottom die, manufacturing a corresponding template of the outer UHPC arc-shaped plate, and pouring UHPC without arranging a steel bar structure in the template.
And step 3: and (5) curing and forming. And (3) after the UHPC is hardened to reach the specified strength, removing the template, and carrying out high-temperature (more than or equal to 90 ℃) steam curing for not less than 48 hours for forming.
After the UHPC is steamed and cured at high temperature for 2-3 days, the duct piece can be transported to the site for installation, and the maintenance of conventional concrete for 28 days is not needed, so that the construction period is greatly saved.
When the shield tunnel is constructed:
step 1: and transversely splicing to form a ring. A plurality of combined shield segment are connected by using bolts 8 on two adjacent segment end steel plates and adopting straight bolts 8, and the joint is embedded with a rubber sheet with a triangular head for sealing and water stopping and is transversely spliced into a ring.
Step 2: and longitudinally splicing to form the shield tunnel. Two adjacent ring shield segments are connected by using respective bolt 8 holes on the parallel side steel plates and adopting a straight bolt 8, the joint is embedded with a rubber sheet with a triangular head for sealing and stopping water, and the longitudinal staggered joints are spliced into a ring shield tunnel.
And step 3: and (6) disassembling. As a temporary structure, the shield tunnel needs to be dismantled, and can be dismantled sequentially through the straight bolts 8 on the loose end steel plate and the arc-shaped side steel plate.
This embodiment combines together steel section of jurisdiction and UHPC (being ultra high performance concrete) section of jurisdiction, has improved the intensity and the rigidity of shield structure section of jurisdiction, has alleviateed the dead weight of section of jurisdiction, makes the bolt 8 between the combination section of jurisdiction connect very conveniently, has improved the efficiency of construction for tunnel lining construction installation, dismantlement are all comparatively convenient, and water stopping performance is good. Especially, when the shield segment is used in a station range, the shield segment can be quickly detached and repeatedly used for the construction of the next subway station section, and the special advantage of reducing the construction cost and the construction efficiency of the tunnel is displayed.
The present invention is not limited to the above embodiment, and various modifications and variations of the present invention are intended to be included within the scope of the claims and the equivalent technology if they do not depart from the spirit and scope of the present invention.
Claims (8)
1. A detachable light steel-UHPC combined shield segment is characterized by comprising an inner layer steel segment and an outer layer ultra-high strength concrete segment;
the inner steel sub-pipe comprises an arc-shaped steel back plate, side plates arranged on two sides of the steel back plate and end plates arranged at two ends of the steel back plate;
the convex outer surface of the steel back plate is provided with a connecting piece, and the outer-layer ultrahigh-strength concrete duct piece is tightly attached to the steel back plate through the connecting piece;
connecting holes are respectively formed in the side plates and the end plates, and adjacent detachable light steel-UHPC combined shield segments are connected with the connecting holes in a penetrating mode through fasteners to achieve splicing connection.
2. The detachable light steel-UHPC combined shield segment as claimed in claim 1, wherein a plurality of stiffening ribs are arranged between two side plates at intervals.
3. The detachable light steel-UHPC combined shield segment of claim 2, wherein the stiffening ribs are square steel tubes.
4. The detachable light steel-UHPC combined shield segment as claimed in any one of claims 2-3, wherein the side plates and the end plates are steel plates.
5. The detachable light steel-UHPC combined shield segment as claimed in claim 4, wherein a water stop sheet is arranged between adjacent detachable light steel-UHPC combined shield segments.
6. The detachable light steel-UHPC combined shield segment as recited in claim 5, wherein one end of the water stop sheet is arranged in a thickening manner, and one end of the thickened water stop sheet is flush with the upper surface of the outer layer ultrahigh-strength concrete segment.
7. The removable light gauge steel-UHPC combined shield segment of claim 5, wherein the connectors are outwardly directed studs disposed on the steel backing plate.
8. The removable light gauge steel-UHPC composite shield segment of claim 7, wherein the fasteners are bolts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202020632465.XU CN212225242U (en) | 2020-04-23 | 2020-04-23 | Detachable light steel-UHPC combined shield segment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020632465.XU CN212225242U (en) | 2020-04-23 | 2020-04-23 | Detachable light steel-UHPC combined shield segment |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112459805A (en) * | 2020-12-30 | 2021-03-09 | 中铁二十五局集团有限公司 | Shield segment dismounting construction method |
| CN114592739A (en) * | 2022-03-22 | 2022-06-07 | 辽宁省城乡市政工程集团有限责任公司 | Semi-assembly type ultra-deep superposed water storage tank and construction process |
| CN114703898A (en) * | 2022-04-19 | 2022-07-05 | 河南省水利勘测设计研究有限公司 | Quick underwater assembly water stop structure |
-
2020
- 2020-04-23 CN CN202020632465.XU patent/CN212225242U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112459805A (en) * | 2020-12-30 | 2021-03-09 | 中铁二十五局集团有限公司 | Shield segment dismounting construction method |
| CN112459805B (en) * | 2020-12-30 | 2022-05-20 | 中铁二十五局集团有限公司 | Shield segment dismounting construction method |
| CN114592739A (en) * | 2022-03-22 | 2022-06-07 | 辽宁省城乡市政工程集团有限责任公司 | Semi-assembly type ultra-deep superposed water storage tank and construction process |
| CN114592739B (en) * | 2022-03-22 | 2024-04-26 | 辽宁省城乡市政工程集团有限责任公司 | Semi-assembled ultra-deep superposed water storage tank and construction process |
| CN114703898A (en) * | 2022-04-19 | 2022-07-05 | 河南省水利勘测设计研究有限公司 | Quick underwater assembly water stop structure |
| CN114703898B (en) * | 2022-04-19 | 2023-11-14 | 河南省水利勘测设计研究有限公司 | Quick underwater assembly water stop structure |
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