CN209799989U - Segment structure for quasi-rectangular shield tunnel - Google Patents
Segment structure for quasi-rectangular shield tunnel Download PDFInfo
- Publication number
- CN209799989U CN209799989U CN201920459524.5U CN201920459524U CN209799989U CN 209799989 U CN209799989 U CN 209799989U CN 201920459524 U CN201920459524 U CN 201920459524U CN 209799989 U CN209799989 U CN 209799989U
- Authority
- CN
- China
- Prior art keywords
- arch
- section
- arc section
- segment
- arc
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Lining And Supports For Tunnels (AREA)
Abstract
The utility model discloses a kind of rectangle shield constructs section of jurisdiction structure for tunnel, including the section of jurisdiction body, the cross-section of jurisdiction body is the kind rectangle form, and the section of jurisdiction body is including being located the arch end circular arc section, vault circular arc section and two arch waist circular arc sections, and characteristics are provided with first external prestressing tendons on the vault circular arc section, and the first end and the second end at vault circular arc section are installed respectively at the both ends of first external prestressing tendons, are provided with the external prestressing tendons of second on the arch end circular arc section, and the first end and the second end at arch end circular arc section are installed respectively at the both ends of the external prestressing tendons of second. The construction method has the advantages that the external prestressed tendons are arranged on the arch crown arc section and the arch bottom arc section respectively, the prestressing force is applied to the segment body in advance, and the segment body is used for offsetting positive and negative bending moments generated by external water and soil pressure, grouting pressure and the like, so that the segment can meet the design requirements of large span and good rigidity, is simple and rapid to operate, short in construction operation time and convenient to process, and can greatly shorten the construction period and reduce the construction cost.
Description
Technical Field
The utility model belongs to the technical field of the tunnel shield technique and specifically relates to a kind of rectangle shield constructs section of jurisdiction structure for tunnel.
Background
With the continuous development of the underground shield technology in China, the design and construction of underground space tend to be diversified and economical, a large-span shield tunnel becomes a design trend of the development of the underground space, and especially an elliptical (rectangle-like) large-span subway shield interval has good environmental and economic benefits in engineering application. Chinese patent No. 201511018839.9 discloses a segment structure of a quasi-rectangular shield tunnel, the cross section of which is in a quasi-rectangular shape, the segment structure includes: the arch bottom arc section is positioned at the arch bottom position of the section, the arch top arc section is positioned at the arch top position of the section, and the two arch waist arc sections are positioned at the arch waist positions at the two sides of the section; the radiuses of the two arched waist arc sections are equal and are both smaller than the radius of the arched bottom arc section and the radius of the arched top arc section; the arch bottom arc section is respectively connected with the two arch waist arc sections in a smooth and tangent mode, and the arch top arc section is respectively connected with the two arch waist arc sections in a smooth and tangent mode. Above-mentioned structure is used in the great tunnel of darker or span, and the section of jurisdiction itself needs great rigidity just can its deformation of effective control, and in order to make section of jurisdiction itself possess great rigidity, the scheme that adopts usually reduces the span, changes the section of jurisdiction material of higher rigidity etc. for improving section of jurisdiction thickness, increase section of jurisdiction arrangement of reinforcement, increase middle standing pillar, so can lead to economic cost's increase, the unreasonable of design, can increase the degree of difficulty of construction simultaneously for construction cycle is longer.
Disclosure of Invention
The utility model aims to solve the technical problem that a type of rectangle shield that simple structure, with low costs, easily construction and rigidity are big, be suitable for to use in the great tunnel of deepening or span is the section of jurisdiction structure for the tunnel is provided.
The utility model provides a technical scheme that above-mentioned technical problem adopted does:
a segment structure for a quasi-rectangular shield tunnel comprises a segment body, wherein the section of the segment body is in a quasi-rectangular shape, the segment body comprises an arch bottom arc section positioned at the arch bottom of the section, an arch top arc section positioned at the arch top of the section and two arch waist arc sections positioned at the arch waist positions at two sides of the section, the radiuses of the two arch waist arc sections are equal and are respectively smaller than the radius of the arch bottom arc section and the radius of the arch top arc section, the first end and the second end of the arch bottom arc section are respectively connected with the two arch waist arc sections in a smooth and tangent mode, the first end and the second end of the arch top arc section are respectively connected with the two arch waist arc sections in a smooth and tangent mode, a first external pre-stress tendon is arranged on the arch top arc section, and the two ends of the first external pre-stress tendon are respectively arranged at the first end and the second end of the arch top arc section, the arched bottom arc section is provided with a second external prestressed tendon, and two ends of the second external prestressed tendon are respectively installed at the first end and the second end of the arched bottom arc section; under the unloaded state, the middle part of the first external prestressed tendon is sunken downwards, and the middle part of the second external prestressed tendon is raised upwards.
The middle position of the inner wall of the arch crown circular arc section is provided with a first convex outer wedge body, the first outer wedge body is provided with a first mounting hole which is communicated from left to right, one end of a first outer prestressed tendon is fixedly mounted at the first end of the arch crown circular arc section, and the other end of the first outer prestressed tendon penetrates through the first mounting hole and is fixedly mounted at the second end of the arch crown circular arc section. The middle position of the first external prestressed tendon is provided with a stable installation and positioning through the first external wedge-shaped body, so that the first external prestressed tendon forms a bending straight line shape with bilateral symmetry, forms a tension type, and provides better stress performance and rigidity for the whole segment.
The middle position of the inner wall of the arched bottom arc section is provided with a second convex external wedge body, the second external wedge body is provided with a second mounting hole which is communicated from left to right, one end of the second external prestressed tendon is fixedly arranged at the first end of the arched bottom arc section, and the other end of the second external prestressed tendon passes through the second mounting hole and is fixedly arranged at the second end of the arched bottom arc section. The middle position of the second external prestressed tendon is provided with a stable installation and positioning through the second external wedge-shaped body, so that the second external prestressed tendon forms a bending straight line shape with bilateral symmetry, forms a tension type, and provides better stress performance and rigidity for the whole segment.
The first end and the second end of the arch crown arc section are respectively provided with an anchorage groove, and an anchorage used for anchoring the end head of the first external prestressed tendon is arranged in the anchorage groove. An installation space is provided for the installation of the anchorage device through the anchorage device groove, and two ends of the first body external prestressed tendons are respectively anchored and installed on the anchorage devices at corresponding positions, so that the stable installation of the first body external prestressed tendons is ensured, and the first body external prestressed tendons can provide stable stress performance and rigidity.
The first end and the second end of the arched bottom arc section are respectively provided with an anchorage groove, and an anchorage used for anchoring the end head of the second external prestressed tendon is arranged in the anchorage groove. An installation space is provided for the installation of the anchorage device through the anchorage device groove, and two ends of the second external prestressed tendon are respectively anchored and installed on the anchorage device at the corresponding position, so that the stable installation of the second external prestressed tendon is ensured, and the second external prestressed tendon is enabled to provide stable stress performance and rigidity.
The arch waist circular arc section is internally provided with an internal prestressed tendon which is of an arc structure matched with the radian of the arch waist circular arc section in an unloaded state. Set up internal prestressing tendons in hunch waist circular arc section for the rigidity and the atress performance of whole section of jurisdiction are better, and through the setting of this internal prestressing tendons, cooperate with two external prestressing tendons, can offset because produced positive and negative moment of flexure such as outside water and soil pressure, slip casting pressure, make the span of section of jurisdiction can be bigger, satisfy the construction requirement.
Arched waist circular arc section in be provided with a hollow tube, the hollow tube include with arched waist circular arc section radian matched with segmental arc and be mirror symmetry setting and be in the incurve straightway at segmental arc both ends, internal prestressing tendons cross-under set up in the hollow tube, internal prestressing tendons including set up the segmental arc in the segmental arc with set up the sharp erection segment at segmental arc both ends, the shape of segmental arc with the segmental arc cooperate, sharp erection segment set up be in the incurve straightway in, just the end of sharp erection segment stretch out incurve straightway respectively fixed mounting in the both ends of arched waist circular arc section. The middle hollow tube is beneficial to the quick and accurate penetration of the prestressed tendon.
The connecting part of the arc-shaped section and the inner bending straight line section is provided with a steering plate, two ends of the arch waist arc-shaped section are respectively provided with an anchorage groove, and an anchorage used for anchoring the straight line installation section is arranged in the anchorage groove. The steering plate has a guiding function on the steering of the hollow pipe and simultaneously has a supporting function on the installation of the hollow pipe; an installation space is provided for the installation of the anchorage device through the anchorage device groove, and two ends of the prestressed tendons in the body are respectively anchored and installed on the anchorage devices at corresponding positions, so that the stable installation of the prestressed tendons in the body is ensured, and the prestressed tendons in the body can provide stable stress performance and rigidity.
The first external prestressed tendon, the second external prestressed tendon and the internal prestressed tendon are steel strands. The steel strand is a material formed by twisting a plurality of steel wires together, the prestressed tendons adopt the steel strands, so that the prestressed tendons have the characteristics of high strength, high toughness, good relaxation performance and the like, and are straightened when being unfolded, so that the tensile strength grade of the prestressed tendons is higher.
The arched bottom arc section, the arched top arc section and the arched waist arc section are all of steel plate structures. Above-mentioned design for whole section of jurisdiction body constructs the section of jurisdiction for a steel, and more traditional concrete section of jurisdiction, the steel constructs the section of jurisdiction and has advantages such as the quality is light, processing is convenient, is guaranteeing under the prerequisite of rigidity, can shorten time limit for a project, reduce cost obviously.
compared with the prior art, the utility model has the advantages of: simple structure, through set up external prestressing tendons respectively on arch crown circular arc section and arch crown circular arc section, prestressing force is applyed on the section of jurisdiction body in advance, be arranged in the tunnel outside water and soil pressure when the section of jurisdiction is installed, the positive and negative moment of flexure that produces such as slip casting pressure, need not to process the stand structure in section of jurisdiction outer check, make the section of jurisdiction can satisfy the span big, the design demand that rigidity is good, easy and simple to handle rapidly simultaneously, construction operation time is short, the processing of being convenient for, the time limit for a project can be shortened greatly, reduce engineering cost, be suitable for using in the tunnel of darker or the great span.
Drawings
Fig. 1 is a schematic cross-sectional structural view of a first embodiment of the present invention;
Fig. 2 is a schematic sectional structure diagram of a second embodiment of the present invention;
FIG. 3 is an enlarged schematic view of the structure at A in FIG. 2;
Fig. 4 is an enlarged schematic view of a portion B in fig. 2.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
The first embodiment is as follows: as shown in figure 1, a segment structure for a quasi-rectangular shield tunnel comprises a segment body 1, wherein the section of the segment body 1 is in a quasi-rectangular shape, the segment body 1 comprises an arch bottom arc section 11 positioned at the arch bottom position of the section, an arch top arc section 12 positioned at the arch top position of the section, and two arch waist arc sections 13 positioned at the arch waist positions at two sides of the section, the radiuses of the two arch waist arc sections 13 are equal and smaller than the radius of the arch bottom arc section 11 and the radius of the arch top arc section 12, the first end and the second end of the arch bottom arc section 11 are respectively connected with the two arch waist arc sections 13 in a smooth and tangent mode, the first end and the second end of the arch top arc section 12 are respectively connected with the two arch waist arc sections 13 in a smooth and tangent mode, a first external pre-stress tendon 2 is arranged on the arch top arc section 12, the first end and the second end of the first external pre-stress tendon 2 are respectively arranged at, the arched bottom arc section 11 is provided with a second external prestressed tendon 3, and two ends of the second external prestressed tendon 3 are respectively arranged at the first end and the second end of the arched bottom arc section 11; under the unloaded state, the middle part of the first external prestressed tendon 2 is sunken downwards, and the middle part of the second external prestressed tendon 3 is raised upwards.
In this embodiment, a first convex outer wedge 121 is disposed at a middle position of an inner wall of the dome arc section 12, a first mounting hole 1211 penetrating from left to right is disposed on the first outer wedge 121, one end of the first outer tendon 2 is fixedly mounted at a first end of the dome arc section 12, and the other end of the first outer tendon 2 passes through the first mounting hole 1211 and is fixedly mounted at a second end of the dome arc section 12. The middle position of the first external prestressed tendon 2 is provided with a stable installation and positioning through the first external wedge-shaped body 121, so that the first external prestressed tendon 2 forms a bending straight line shape with bilateral symmetry, forms a tension type, and provides better stress performance and rigidity for the whole segment.
In this embodiment, a second convex external wedge 111 is disposed at the middle position of the inner wall of the arched bottom arc section 11, a second mounting hole 1111 is disposed on the second external wedge 111 and penetrates from left to right, one end of the second external tendon 3 is fixedly mounted at the first end of the arched bottom arc section 11, and the other end of the second external tendon 3 passes through the second mounting hole 1111 and is fixedly mounted at the second end of the arched bottom arc section 11. The middle position of the second external prestressed tendon 3 is provided with a stable installation and positioning through the second external wedge-shaped body 111, so that the second external prestressed tendon 3 forms a bending straight line shape with bilateral symmetry, forms a tension type, and provides better stress performance and rigidity for the whole segment.
In this embodiment, the first end and the second end of the arch crown segment 12 are respectively provided with an anchorage groove 4, and an anchorage 41 for anchoring the end of the first external prestressed tendon 2 is arranged in the anchorage groove 4. An installation space is provided for the installation of the anchorage device 41 through the anchorage device groove 4, and two ends of the first external prestressed tendon 2 are respectively anchored and installed on the anchorage device 41 at the corresponding position, so that the stable installation of the first external prestressed tendon 2 is ensured, and the first external prestressed tendon is enabled to provide stable stress performance and rigidity.
In this embodiment, the first end and the second end of the arcuate arch bottom segment 11 are respectively provided with an anchorage groove 4, and an anchorage 41 for anchoring the end of the second extrabody tendon 3 is provided in the anchorage groove 4. An installation space is provided for the installation of the anchorage device 41 through the anchorage device groove 4, and two ends of the second external prestressed tendon 3 are respectively anchored and installed on the anchorage device 41 at the corresponding position, so that the stable installation of the second external prestressed tendon 3 is ensured, and the second external prestressed tendon is enabled to provide stable stress performance and rigidity.
In this particular embodiment, the first and second external tendons 2 and 3 are steel strands. The steel strand is a material formed by twisting a plurality of steel wires together, the prestressed tendons adopt the steel strands, so that the prestressed tendons have the characteristics of high strength, high toughness, good relaxation performance and the like, and are straightened when being unfolded, so that the tensile strength grade of the prestressed tendons is higher.
In this embodiment, the arch bottom arc segment 11, the arch top arc segment 12 and the arch waist arc segment 13 are all made of steel plate. Above-mentioned design for whole section of jurisdiction body 1 constructs the section of jurisdiction for a steel, and more traditional concrete section of jurisdiction, the steel constructs the section of jurisdiction and has advantages such as the quality is light, processing is convenient, under the prerequisite of ensureing rigidity, can shorten time limit for a project, reduce cost obviously.
Example two: as shown in fig. 2 to 4, the other parts are the same as the first embodiment, except that the internal tendon 5 is disposed in the arcade section 13, and in an unloaded state, the internal tendon 5 has an arc structure matching with the radian of the arcade section 13. Set up internal prestressing tendons 5 in hunch waist circular arc section 13 for the rigidity and the atress performance of whole section of jurisdiction are better, and through this internal prestressing tendons 5's setting, cooperate with two external prestressing tendons, can offset because produced positive and negative moment of flexure such as outside water and soil pressure, slip casting pressure, make the span of section of jurisdiction can be bigger, satisfy the construction requirement.
in this embodiment, be provided with a hollow tube 6 in the hunch waist circular arc section 13, hollow tube 6 includes with hunch waist circular arc section 13 radian matched with segmental arc 61 and be the incurve straightway 62 that mirror symmetry set up at segmental arc 61 both ends, internal prestressing tendons 5 cross-under sets up in hollow tube 6, internal prestressing tendons 5 is including setting up the rest segment 51 in segmental arc 61 and setting up the sharp erection segment 52 at rest segment 51 both ends, the shape of rest segment 51 cooperatees with the arc of segmental arc 61, sharp erection segment 52 sets up in incurve straightway 62, and the end of sharp erection segment 52 stretches out incurve straightway 62 and respectively fixed mounting at the both ends of hunch waist circular arc section 13. The middle hollow pipe 6 is beneficial to the quick and accurate penetration of the prestressed tendon.
In this embodiment, a steering plate 7 is disposed at the junction of the arc section 61 and the inner curved straight section 62, two anchor grooves 4 are disposed at two ends of the arch arc section 13, and an anchor 41 for anchoring the straight installation section 52 is disposed in the anchor groove 4. The steering plate 7 plays a role in guiding the steering of the hollow pipe 6 and simultaneously plays a role in supporting the installation of the hollow pipe 6; an installation space is provided for the installation of the anchorage device 41 through the anchorage device groove 4, and two ends of the internal prestressed tendon 5 are respectively anchored and installed on the anchorage device 41 at the corresponding position, so that the stable installation of the internal prestressed tendon 5 is ensured, and the internal prestressed tendon is enabled to provide stable stress performance and rigidity.
In this embodiment, the internal tendons 5 are steel strands. The steel strand is a material formed by twisting a plurality of steel wires together, the prestressed tendons adopt the steel strands, so that the prestressed tendons have the characteristics of high strength, high toughness, good relaxation performance and the like, and are straightened when being unfolded, so that the tensile strength grade of the prestressed tendons is higher.
Claims (10)
1. A segment structure for a quasi-rectangular shield tunnel comprises a segment body, wherein the section of the segment body is in a quasi-rectangular shape, the segment body comprises an arch bottom arc section positioned at the arch bottom of the section, an arch top arc section positioned at the arch top of the section and two arch waist arc sections positioned at the arch waist positions at two sides of the section, the radiuses of the two arch waist arc sections are equal and are respectively smaller than the radius of the arch bottom arc section and the radius of the arch top arc section, the first end and the second end of the arch bottom arc section are respectively connected with the two arch waist arc sections in a smooth and tangent mode, the first end and the second end of the arch top arc section are respectively connected with the two arch waist arc sections in a smooth and tangent mode, the segment structure is characterized in that a first external pre-stress rib is arranged on the arch top arc section, and the two ends of the first external pre-stress rib are respectively arranged at the first end and the second end of the arch top arc section, the arched bottom arc section is provided with a second external prestressed tendon, and two ends of the second external prestressed tendon are respectively installed at the first end and the second end of the arched bottom arc section; under the unloaded state, the middle part of the first external prestressed tendon is sunken downwards, and the middle part of the second external prestressed tendon is raised upwards.
2. The segment structure of claim 1, wherein a first raised outer wedge is disposed at a middle position of an inner wall of the arch crown circular arc section, the first outer wedge is provided with a first mounting hole penetrating from left to right, one end of the first outer pre-stressed tendon is fixedly mounted at a first end of the arch crown circular arc section, and the other end of the first outer pre-stressed tendon passes through the first mounting hole and is fixedly mounted at a second end of the arch crown circular arc section.
3. The segment structure for a quasi-rectangular shield tunnel according to claim 1 or 2, wherein a second convex external wedge is disposed at the middle position of the inner wall of the arch bottom circular arc section, the second external wedge is provided with a second mounting hole penetrating from left to right, one end of the second external pre-stressed tendon is fixedly mounted at the first end of the arch bottom circular arc section, and the other end of the second external pre-stressed tendon passes through the second mounting hole and is fixedly mounted at the second end of the arch bottom circular arc section.
4. The segment structure for a quasi-rectangular shield tunnel according to claim 1, wherein the first end and the second end of the arch crown arc segment are respectively provided with an anchorage groove, and an anchorage for anchoring the end of the first external pre-stressed tendon is arranged in the anchorage groove.
5. The segment structure for a quasi-rectangular shield tunnel according to claim 1, wherein the first end and the second end of the arch bottom arc segment are respectively provided with an anchorage groove, and an anchorage for anchoring the end of the second external pre-stressed tendon is arranged in the anchorage groove.
6. The segment structure for a quasi-rectangular shield tunnel according to claim 1, wherein an internal pre-stressed tendon is arranged in the arched waist circular arc section, and the internal pre-stressed tendon is in an arc structure matched with the radian of the arched waist circular arc section in an unloaded state.
7. The segment structure of claim 6, wherein a hollow tube is arranged in the arched arc section, the hollow tube comprises an arc section matched with the arched arc section in radian and inner curved straight sections arranged at two ends of the arc section in mirror symmetry, the internal prestressed tendon is arranged in the hollow tube in a penetrating manner, the internal prestressed tendon comprises a supporting section arranged in the arc section and linear mounting sections arranged at two ends of the supporting section, the shape of the supporting section is matched with the arc shape of the arc section, the linear mounting sections are arranged in the inner curved straight sections, and the ends of the linear mounting sections extend out of the inner curved straight sections and are fixedly mounted at two ends of the arched arc section respectively.
8. The segment structure of claim 7, wherein a connection between the arc segment and the inner curved straight segment is provided with a deflector, two ends of the arch arc segment are respectively provided with an anchorage groove, and an anchorage for anchoring the straight installation segment is arranged in the anchorage groove.
9. The segment structure of claim 6, wherein the first external pre-stressed tendons, the second external pre-stressed tendons and the internal pre-stressed tendons are steel strands.
10. The segment structure for a quasi-rectangular shield tunnel according to claim 1, wherein the arch bottom arc segment, the arch top arc segment and the arch waist arc segment are all of steel plate structures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920459524.5U CN209799989U (en) | 2019-04-08 | 2019-04-08 | Segment structure for quasi-rectangular shield tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920459524.5U CN209799989U (en) | 2019-04-08 | 2019-04-08 | Segment structure for quasi-rectangular shield tunnel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209799989U true CN209799989U (en) | 2019-12-17 |
Family
ID=68828208
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920459524.5U Active CN209799989U (en) | 2019-04-08 | 2019-04-08 | Segment structure for quasi-rectangular shield tunnel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209799989U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109869166A (en) * | 2019-04-08 | 2019-06-11 | 宁波用躬科技有限公司 | A kind of class rectangle shield tunnel tunnel segment structure and its construction method |
-
2019
- 2019-04-08 CN CN201920459524.5U patent/CN209799989U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109869166A (en) * | 2019-04-08 | 2019-06-11 | 宁波用躬科技有限公司 | A kind of class rectangle shield tunnel tunnel segment structure and its construction method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205024671U (en) | Precast concrete pile | |
| CN100529264C (en) | Method of applying prestress and connecting means used therein and prestressed concrete beam therefrom | |
| CN205969481U (en) | Open broken line prestressing force precast beam stretch -draw pedestal earlier | |
| CN209799989U (en) | Segment structure for quasi-rectangular shield tunnel | |
| CN109869166A (en) | A kind of class rectangle shield tunnel tunnel segment structure and its construction method | |
| CN202787099U (en) | Reinforced concrete cap beam external prestressing structure | |
| CN201265157Y (en) | Post-tensioned unbounded prestressed concrete anti-floating pile | |
| CN201217777Y (en) | Vertical pre-stress anchorage structure of low-retraction steel stranded wire | |
| CN205630974U (en) | Pre -tensioning system precast beam pedestal | |
| US4065897A (en) | Precast skeleton spatial monolithic structure | |
| CN107829444B (en) | Wind turbine generator system prestressing force foundation structure | |
| CN208586817U (en) | A kind of external prestressing strengthening concrete frame beam structure | |
| CN102561199A (en) | Method of vertical crack resistance of hogging moment tension zone of single-column concrete bridge pier | |
| CN208586602U (en) | The cast-in-place hollow continuous underground wall structure of post-tensioned prestressed concrete | |
| CN1978802A (en) | Super-length prestressed ground beam construction method | |
| CN214464676U (en) | Wind power tower cylinder with all-section tensioning prestressed concrete structure | |
| CN109469069A (en) | A kind of I-shaped support pile of prestressing force and foundation pit supporting method | |
| CN2916133Y (en) | H-shape girder steel with reinforcement device | |
| CN101614053A (en) | High flexibility pre-pressing method pre-stress steel bar and its implementation | |
| CN209339015U (en) | It is constructed using the old T-type bridge reinforcement of steel strand wires and polymer-modified concrete | |
| CN205529907U (en) | P -type anchorage device at fixed end | |
| CN107599158A (en) | A kind of process for prestressed component two directions tension | |
| CN104652430A (en) | Composite reinforcement partially prestressed concrete solid square pile and manufacturing method thereof | |
| CN203347018U (en) | T-shaped-end-head pre-buried rebar | |
| CN204940273U (en) | A kind of Prestressed anchor rope with pressure dispersing construction equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |