CN113530295A - Prefabricated assembly type historic building reinforcing and mounting structure - Google Patents
Prefabricated assembly type historic building reinforcing and mounting structure Download PDFInfo
- Publication number
- CN113530295A CN113530295A CN202110811000.XA CN202110811000A CN113530295A CN 113530295 A CN113530295 A CN 113530295A CN 202110811000 A CN202110811000 A CN 202110811000A CN 113530295 A CN113530295 A CN 113530295A
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- Prior art keywords
- ring
- grouting
- block
- steel bars
- stirring
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- 230000003014 reinforcing effect Effects 0.000 title abstract description 9
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 23
- 239000010959 steel Substances 0.000 claims abstract description 23
- 230000005540 biological transmission Effects 0.000 claims abstract description 20
- 238000007789 sealing Methods 0.000 claims abstract description 11
- 238000003756 stirring Methods 0.000 claims description 33
- 239000011440 grout Substances 0.000 claims description 32
- 238000006073 displacement reaction Methods 0.000 claims description 13
- 238000010030 laminating Methods 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 30
- 238000002347 injection Methods 0.000 abstract description 14
- 239000007924 injection Substances 0.000 abstract description 14
- 229910001294 Reinforcing steel Inorganic materials 0.000 abstract description 8
- 238000001125 extrusion Methods 0.000 abstract description 6
- 230000008602 contraction Effects 0.000 abstract description 2
- 230000000149 penetrating effect Effects 0.000 abstract 2
- 230000002787 reinforcement Effects 0.000 description 10
- 238000000034 method Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 241000156961 Coenonympha Species 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
- E04C5/162—Connectors or means for connecting parts for reinforcements
- E04C5/163—Connectors or means for connecting parts for reinforcements the reinforcements running in one single direction
- E04C5/165—Coaxial connection by means of sleeves
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Mechanical Engineering (AREA)
- Reinforcement Elements For Buildings (AREA)
Abstract
The invention provides a prefabricated assembly type historic building reinforcing and mounting structure, which comprises: the grouting device comprises a main body, connecting steel bars, grouting sleeves, grouting ports and sealing rings, wherein the connecting steel bars are arranged on the periphery of the main body in a penetrating and inner protruding part, the grouting sleeves are embedded in the penetrating parts among the connecting steel bars, the grouting ports are arranged at the top ends of the grouting sleeves close to openings on two sides, when grouting material is injected into the transmission ring arranged by the device, the transmission ring is driven to contract, rotate and attach to the surface of the connecting reinforcing steel bar for attachment by extrusion pressure caused by injection, so as to limit and fix the connecting reinforcing steel bar to a certain extent, meanwhile, when the transmission ring is rotated and contracted, the abutting blocks at one side of the contracting blocks around the transmission ring can be attached to the connecting steel bars when the contraction blocks are contracted, the connection reinforcing steel bars are limited and reinforced by shrinkage and embedding according to the groove convex blocks on the connection reinforcing steel bars, so that the connection reinforcing bars are embedded into the grouting sleeve, and the stability of the grouting sleeve is affected due to the inclination deviation caused by the gaps among the connection reinforcing bars when the grouting material is injected.
Description
Technical Field
The invention relates to the technical field of fabricated buildings, in particular to the technical field of prefabricated assembled reinforcing and mounting structures for historic buildings.
Background
The assembly type building is characterized in that each component and each accessory in the building are independently manufactured according to the requirement, then the manufactured components and accessories are transported to a building site for assembly and installation, the connection of each existing component and each existing accessory is embedded into a grouting sleeve through a connecting steel bar of a protruding part when the assembly and installation are carried out, then grouting material is injected into the grouting material for solidification and fixation, so that the connecting steel bar inside the grouting sleeve can be fixed in the grouting sleeve to connect each component and each accessory, but the existing grouting sleeve can be attached to the inner wall of a grouting opening due to the adhesion of the grouting material when the grouting material is injected through the grouting opening and then solidifies, so that the grouting material is easily blocked at the grouting opening when the grouting material is injected, and simultaneously, gaps exist between the grouting material and the inner wall of the existing grouting sleeve when the connecting steel bar is embedded into the grouting sleeve, so that the connection stability between the connecting steel bars is influenced by the inclination and the deviation easily generated when the connecting steel bars are embedded in the grouting sleeve and the grouting material is injected.
Disclosure of Invention
Problem (A)
In conclusion, the prefabricated ancient building reinforcing and mounting structure is provided, and is used for solving the problem that the connection stability is influenced by the fact that the connection reinforcing steel bars incline and deviate in the grouting sleeve when grouting materials are injected into the existing prefabricated ancient building reinforcing and mounting structure in the way that the grouting sleeve is connected with the grouting materials which are partially adhered to in the injection process and solidified on the inner wall of the grouting opening to cause blockage.
(II) technical scheme
The utility model provides a mounting structure is consolidated to ancient building of prefabricated assembled, includes: the main part, the connecting reinforcement, grout sleeve, grout mouth and sealing washer, it is provided with the connecting reinforcement to run through inside bulge around the main part, it is provided with grout sleeve to run through partial gomphosis between the connecting reinforcement, grout sleeve top is close to both sides opening and is provided with the grout mouth, the inside both sides fixedly connected with sealing washer of grout sleeve, grout mouthful inner wall overlaps the laminating and is provided with stirring ring and driving ring, laminating driving ring both sides gomphosis is provided with the limit ring around the grout sleeve inner wall.
Further, grout sleeve is including the grout mouth, the sealing washer, the limit ring, stirring ring and drive ring, the grout mouth sets up in the circle axle that is close to both sides on grout sleeve top for protruding opening, the sealing washer is the convex rubber ring of the inside both ends fixed connection of grout sleeve, the limit ring is for being located the ring of grout sleeve inner wall grout mouth opening both sides, the ring that the gomphosis of stirring ring for grout mouth inner wall set up, the drive ring sets up in the ring that stirs the ring bottom at grout mouth inner wall for the gomphosis, and drive ring both sides and limit ring removal screw-thread fit.
Furthermore, the limiting rings comprise extending grooves, a bundling block and a resisting block, the extending grooves are grooves communicated with the inner hollow part at one side of the limiting rings, the bundling block is an arc bending rectangular square block which is embedded between each limiting ring and the inner hollow part, the bundling block and the limiting rings are spliced with each other to form a circular ring, the resisting block is a plurality of bending rectangular blocks which are connected in an elastic mode through springs and arranged in a fit mode in a groove at one side of the bundling block, and one end of the resisting block is arranged in an inclined arc extending mode.
Furthermore, mix the ring including impact piece and screw shaft, the impact piece is the rectangular form square that a plurality of one sides of stirring ring inner wall are slope circular arc sunken, and the screw shaft is the circular shaft that stirs the gomphosis of the bottom end bulge setting of ring.
Further, the driving ring is including shaking the ring, the displacement groove, the screw thread piece, shake piece and dislocation piece, shake the ring through spring elastic connection's ring in the ring recess around the driving ring middle part, the displacement groove is the rectangular form fluting of the crooked form of a plurality of circular arcs of driving ring top surface, the screw thread piece sets up in the lug that length is littleer in the displacement groove for shaking ring top gomphosis, and screw thread piece lug top and screw thread shaft thread laminating, shake the piece for shaking the inner wall around the ring middle part with the lug that the impact block is unanimous, the dislocation piece is a plurality of squares that make up into vibrations through upper and lower lug and recess gomphosis each other.
(III) advantageous effects
(1) The transmission ring that sets up through the device is pouring into the grout material in the time because the extrusion that the injection makes is exerted pressure and is driven its transmission ring and contract rotatory laminating and laminate to the connecting reinforcement surface, come to carry out certain spacing fixed to the connecting reinforcement, the piece that supports of one side can laminate to the connecting reinforcement when the shrink is restrained to the transmission ring on its every side in rotatory shrink simultaneously, carry out the shrink embedment according to the recess lug on its connecting reinforcement and carry out spacing reinforcement to the connecting reinforcement, thereby make in the connecting reinforcement gomphosis advance grout sleeve because the space between lead to taking place the skew when pouring into the grout material and influence its steadiness.
(2) The device still is provided with the stirring ring, and the extrusion that makes because the injection into when pouring into grouting material through the stirring ring is exerted pressure and is driven it and take place to rotate and mix grouting material and can not depend on at grout mouthful inner wall and solidify to lead to its grout mouthful to take place to block up and make the injection of its grout mouthful receive the influence.
(3) The device still is provided with the transmission ring, can take place certain rotatory vibrations that take place of delaying through the inside vibrations ring that sets up of transmission ring in rotatory to make because the vibrations that reset of vibrations ring lets its middle part make up into the dislocation piece of vibrations piece and take place the dislocation removal, the dislocation removal through the dislocation piece carries out further stirring to the grout material of pouring into and prevents that it from depending on to solidify the inside formation of grout hole and block up.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic diagram of a side sectional structure of the grout sleeve of the present invention;
FIG. 3 is a schematic side view of the overall structure of the grouting opening of the present invention;
FIG. 4 is an enlarged view of the structure at A in FIG. 3 according to the present invention;
FIG. 5 is a schematic view of the overall construction of the drive ring of the present invention;
FIG. 6 is an enlarged view of the structure of FIG. 5 at B according to the present invention;
in fig. 1 to 6, the corresponding relationship between the part names or lines and the reference numbers is:
the grouting device comprises a main body 1, connecting steel bars 101, a grouting sleeve 2, a grouting opening 201, a sealing ring 202, a limiting ring 203, an extension groove 2031, a convergence block 2032, a resisting block 2033, a stirring ring 204, an impact block 2041, a threaded shaft 2042, a driving ring 205, a vibrating ring 2051, a displacement groove 2052, a threaded block 2053, a vibrating block 2054 and a dislocation block 2055.
Detailed Description
Please refer to fig. 1 to 6
A prefabricated ancient building reinforced installation structure, includes: the main body 1 is connected together through the convex connecting steel bars 101 around, the connecting steel bars 101 are mutually connected in the grouting sleeve 2 towards one end, the other end is embedded and penetrates through the connecting steel bars 101, a grouting opening 201 is formed in a convex opening in the top end of the grouting sleeve 2, sealing rings 202 are fixedly connected to two ends in the grouting sleeve 2, a stirring ring 204 and a transmission ring 205 are mutually attached and overlapped to be arranged in a groove in the inner wall of the grouting opening 201, and a limiting ring 203 is a circular ring with one side being in threaded attachment with the transmission ring 205;
wherein, the grouting sleeve 2 comprises a grouting opening 201, a sealing ring 202, a limiting ring 203, a stirring ring 204 and a driving ring 205, the grouting opening 201 is a protruding opening arranged on the top end of the grouting sleeve 2 near the circular shaft on both sides, the sealing ring 202 is a rubber circular ring fixedly connected with both ends inside the grouting sleeve 2, the limiting ring 203 is a circular ring arranged on both sides of the grouting opening 201 on the inner wall of the grouting sleeve 2, the stirring ring 204 is a circular ring embedded in the inner wall of the grouting opening 201, the driving ring 205 is a circular ring embedded in the bottom end of the stirring ring 204 on the inner wall of the grouting opening 201, and both sides of the driving ring 205 are in threaded fit with one side of the limiting ring 203, when grouting is performed through the grouting opening 201, grouting material can impact the inclined groove of the impact block 2041 protruding around the middle part of the stirring ring 204 on the inner wall due to the injection pressure generated during grouting through the inclined groove angle of the impact block 2041, so that the pressure generated during grouting material can drive the stirring ring 204 to rotate, the grouting material is stirred by the rotation of the stirring ring 204 and the rotation of the impact block 2041, so that the grouting material is solidified in the middle of the injection process, and the grouting opening 201 is blocked and difficult to inject.
Wherein, the applicable diameters of the grouting sleeve 2 are respectively as follows according to the size of the steel bar and the required pouring amount; 0.5m, 0.55m, 0.57m and 0.65m to adapt to the reinforcing steel bars with various sizes and pouring amount.
The limiting rings 203 include an extending groove 2031, a converging block 2032 and a resisting block 2033, the extending groove 2031 is a groove communicated with the inner hollow part at one side of the limiting ring 203, the converging block 2032 is a circular arc curved rectangular square block embedded with the inner hollow part between each limiting ring 203, the converging block 2032 and the limiting rings 203 are spliced with each other to form a circular ring, the resisting block 2033 is a plurality of curved rectangular square blocks which are arranged in an attaching manner and elastically connected through a spring in a groove at one side of the converging block 2032, and one end of each resisting block 2033 is arranged in an inclined circular arc extending manner.
Wherein, stirring ring 204 includes impact piece 2041 and screw axis 2042, and impact piece 2041 is stirring ring 204 inner wall a plurality of sides and is the rectangle form square that the circular arc is sunken that inclines, and screw axis 2042 is stirring ring 204 bottom bulge's circular axis of gomphosis setting. When the driving ring 205 is driven to rotate due to the extrusion pressure during injection, one side of the driving ring is in threaded fit with the limiting ring 203, so that the limiting ring 203 is driven to contract and rotate, and is attached to the connecting steel bar 101 for limiting and fixing,
wherein, the driving ring 205 is including vibrations ring 2051, displacement groove 2052, screw block 2053, vibrations block 2054 and dislocation block 2055, vibrations ring 2051 is the ring through spring elastic connection in the ring recess around the driving ring 205 middle part, displacement groove 2052 is the rectangular form fluting of the crooked form of a plurality of circular arcs of driving ring 205 top surface, screw block 2053 sets up the lug that length is littleer in displacement groove 2052 for vibrations ring 2051 top gomphosis, and screw block 2053 lug top and screw shaft 2042 screw thread laminating, vibrations block 2054 is the lug unanimous with the impact block around vibrations ring 2051 middle part inner wall, dislocation block 2055 is a plurality of squares that make up into vibrations through upper and lower lug and recess gomphosis each other. Can stretch the spring of one side when vibrations ring 2051 takes place the dislocation rotation, can carry out certain impact that resets because of elasticity after screw piece 2053 separates with screw shaft 2042, the impact inertia that produces when reseing through vibrations ring 2051 makes its a plurality of dislocation piece 2055 mutual dislocation displacements that make up into vibrations piece 2054 open, make its vibrations piece 2054 itself can take place certain vibrations and deformation and further stir the grout material of pouring into and prevent that it from solidifying in advance and attach to block up the part at grout hole 201.
(IV) working principle
The invention provides a prefabricated assembly type historic building reinforcing and mounting structure, which comprises the following steps that when a main body 1 is spliced and combined to build a building, through parts of connecting reinforcing steel bars 101 at one side of two main bodies 1 are embedded into the interior of a grouting sleeve 2 for connection, the grouting openings 201 are filled internally to solidify the embedded connecting reinforcing steel bars 101 so as to fix the two main bodies 1 for convenient building, when the grouting is performed through the grouting openings 201, grouting materials impact the inclined grooves of impact blocks 2041 protruding around the middle part of an inner wall stirring ring 204 due to injection pressure generated during injection, the pressure generated during the injection of the grouting materials is guided through the inclined groove angles of the impact blocks 2041 so as to drive the stirring ring 204 to rotate, and the grouting materials are stirred through the rotation of the stirring ring 204 and the rotation of the impact blocks 2041, so that the grouting material is solidified at the middle part in the injection process to block the grouting opening 201 and make the injection difficult, when the grouting material is injected through the grouting opening 201, the grouting material is impacted on the vibration ring 2051 on the inner wall of the driving ring 205 at the bottom end of the stirring ring 204, the driving ring 205 is driven to rotate due to extrusion pressure through the same shape of the vibration ring 2051 and the impact block 2041, when the driving ring 205 starts to rotate, the thread block 2053 embedded in the displacement groove 2052 at the top end of the vibration ring 2051 at the middle part of the driving ring is in contact with the thread shaft 2042 at the attaching side of the stirring ring 204 for thread attachment, the thread block 2053 is driven to displace along the displacement groove 2052 through the displacement rotation of the thread shaft 2042 during attachment, thereby driving the vibration ring 2051 to generate certain dislocation rotation at the middle part of the driving ring 205, and when the vibration ring 2051 generates dislocation rotation, the spring at one side is stretched, after the thread block 2053 is separated from the thread shaft 2042, a certain reset impact is performed due to elasticity, the impact inertia generated when the vibration ring 2051 is reset enables a plurality of dislocation blocks 2055 combined into the vibration block 2054 to be dislocated and displaced, so that the vibration block 2054 per se can generate certain vibration and deformation to further stir the injected grouting material, the grouting material is prevented from being solidified in advance and attached to the grouting opening 201, finally, when the transmission ring 205 is driven to rotate due to extrusion pressing during injection, the limiting ring 203 is forced to be driven to contract and rotate due to the fact that one side of the transmission ring is attached to the thread of the limiting ring 203, so that the transmission ring is attached to the connecting steel bar 101 to be limited and fixed, the contraction of the limiting ring 203 is performed by embedding the shrinkage blocks 2032 among a plurality of surrounding combination blocks into the hollow part inside, and simultaneously, one side of the hollow part of each combination block of the limiting ring 203 is sealed, the binding block 2032 can only contract towards the combination block of the limiting ring 203 on one side, when the binding block 2032 contracts into the limiting ring 203, the plurality of abutting blocks 2033 arranged and combined on one side can contract to a certain extent through the inclined arc on one end to extrude the top end of the slot of the extending groove 2031, so that the binding block 2032 can be embedded and contracted into the limiting ring 203, and when the binding block 2032 is completely embedded into the limiting ring 203, the abutting block 2033 can be ejected into the extending groove 2031 to abut against the surface of the connecting steel bar 101 due to the elastic connection of the spring on one side, and simultaneously, the plurality of abutting blocks 2033 arranged in combination can also contract to be embedded with the groove bump on the surface of the connecting steel bar 101 due to the groove bump on the surface of the connecting steel bar 101, so that the transmission ring 205 is more effective when the connecting steel bar 101 is attached and fixed in a limiting way, and the gap is left between the abutting blocks 2033 when the connecting steel bar 101 is embedded into the grouting sleeve 2, so that the grouting slurry is easy to happen when the connecting steel bar 101 is injected through the grouting opening 201 The inclination is deviated, so that the stability of the connection fitting is affected.
Claims (5)
1. A prefabricated ancient building reinforced installation structure, includes: the grouting device comprises a main body (1), wherein the main body (1) is connected with a grouting sleeve (2) through a connecting steel bar (101), and a sealing ring (202) inside the grouting sleeve (2) is arranged at the opening of a grouting opening (201), and is characterized in that; the stirring ring (204) and the transmission ring (205) are movably attached to the grouting opening (201), and the limiting ring (203) is a circular ring attached to the transmission ring (205) inside the main body (1).
2. The prefabricated reinforced mounting structure for historic buildings according to claim 1, wherein: grout sleeve (2) including grout mouth (201), sealing washer (202), limit ring (203), stirring ring (204) and transmission ring (205), limit ring (203) for setting up at grout mouth (201) opening part both sides ring, grout mouth (201) inner wall activity laminating has stirring ring (204) and transmission ring (205).
3. The prefabricated reinforced mounting structure for historic buildings according to claim 1, wherein: the limiting ring (203) comprises an extending groove (2031), a beam-closing block (2032) and a resisting block (2033), wherein the beam-closing block (2032) is a square block which is provided with the resisting block (2033) at one side and is connected with the extending groove (2031).
4. The prefabricated reinforced mounting structure for the historic building is characterized in that the stirring ring (204) comprises an impact block (2041) and a threaded shaft (2042), the impact block (2041) is a square block connected to the stirring ring (204), and the threaded shaft (2042) is a circular shaft which is convexly arranged at the bottom end of the stirring ring (204).
5. The prefabricated reinforced mounting structure for historic buildings according to claim 1, wherein: the transmission ring (205) comprises a vibration ring (2051), a displacement groove (2052), a thread block (2053), a vibration block (2054) and a dislocation block (2055), the middle of the vibration ring (2051) is connected with a circular ring which is formed by the dislocation block (2055) into a square of the vibration block (2054), and the thread block (2053) is connected into a groove of the displacement groove (2052).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110811000.XA CN113530295A (en) | 2021-07-19 | 2021-07-19 | Prefabricated assembly type historic building reinforcing and mounting structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110811000.XA CN113530295A (en) | 2021-07-19 | 2021-07-19 | Prefabricated assembly type historic building reinforcing and mounting structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113530295A true CN113530295A (en) | 2021-10-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110811000.XA Pending CN113530295A (en) | 2021-07-19 | 2021-07-19 | Prefabricated assembly type historic building reinforcing and mounting structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113530295A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115198971A (en) * | 2022-07-07 | 2022-10-18 | 上海宇辉住宅工业有限公司 | Pre-grouting type full-grouting sleeve structure and construction method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100031607A1 (en) * | 2008-08-11 | 2010-02-11 | Oliva Michael G | Splice System for Fiber-Reinforced Polymer Rebars |
| CN108678287A (en) * | 2018-04-27 | 2018-10-19 | 东南大学 | A kind of bar connecting full grout sleeve of slurry pin bank conjunction |
| CN109989529A (en) * | 2019-02-28 | 2019-07-09 | 上海应用技术大学 | A kind of spliced grout sleeve and building prefabricated components |
-
2021
- 2021-07-19 CN CN202110811000.XA patent/CN113530295A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100031607A1 (en) * | 2008-08-11 | 2010-02-11 | Oliva Michael G | Splice System for Fiber-Reinforced Polymer Rebars |
| CN108678287A (en) * | 2018-04-27 | 2018-10-19 | 东南大学 | A kind of bar connecting full grout sleeve of slurry pin bank conjunction |
| CN109989529A (en) * | 2019-02-28 | 2019-07-09 | 上海应用技术大学 | A kind of spliced grout sleeve and building prefabricated components |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115198971A (en) * | 2022-07-07 | 2022-10-18 | 上海宇辉住宅工业有限公司 | Pre-grouting type full-grouting sleeve structure and construction method |
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Application publication date: 20211022 |