Drilling and blasting method tunnel assembly type UHPC lining structure and construction method

Abstract

The invention discloses a drilling and blasting method tunnel assembly type UHPC (Ultra High Performance Concrete) lining structure. The drilling and blasting method tunnel assembly type UHPC lining structure comprises a plurality of UHPC lining units; a plurality of longitudinal connecting units, wherein each longitudinal connecting unit is fixedly connected with any two adjacent UHPC lining units; and a plurality of annular sealing rubber units, wherein each annular sealing rubber unit is laid on the annular side surface of the corresponding UHPC lining unit. The invention further discloses a construction method of the drilling and blasting method tunnel assembly type UHPC lining structure. Compared with the prior art, the drilling and blasting method tunnel assembly type UHPC lining structure has the advantages that construction is rapid, and the safety and durability of a secondary lining structure are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel engineering, and in particular to a drill-and-blast tunnel assembled UHPC lining structure and a construction method. Background Art

[0002] At present, tunnel construction mainly adopts the drilling and blasting method, that is, the method of excavating tunnels by drilling, charging, and blasting. It has the advantages of strong adaptability to geological conditions and low excavation cost. The drilling and blasting tunnel mainly adopts a composite lining support scheme. After the tunnel is excavated, the initial support that is close to the surrounding rock is promptly applied. After the deformation of the surrounding rock is stable, the secondary lining (generally cast concrete) is applied, and a waterproof layer is set between the initial support and the secondary lining as needed. The secondary lining can provide additional bearing capacity and rigidity for the tunnel, enhance the overall stability of the tunnel structure, and share the load caused by external factors such as ground stress and groundwater pressure, effectively reducing the deformation and displacement of the tunnel structure, thereby ensuring the normal use of the tunnel. It is an important part of the tunnel engineering support structure. In addition, the secondary lining also plays a role in waterproofing and corrosion prevention, and improves the safety and comfort of the tunnel structure.

[0003] At present, the secondary lining construction of drill-and-blast tunnels generally adopts cast-in-place concrete molding technology, which has complex construction procedures, long construction time and high labor intensity. In the actual construction process, the problem of insufficient thickness and strength of the vault concrete often occurs, which may cause cracking and falling of concrete, seriously endangering the stability of the tunnel structure and operational safety. The main reason for the insufficient thickness and strength of the secondary lining vault is that the initial support of the vault is uneven, there is a longitudinal slope, and it is difficult to observe the construction conditions, which makes it difficult to fill the local concrete with cavities. In addition, the lack of concrete vibration and water shrinkage during the hardening process of concrete also lead to insufficient thickness and strength of the vault concrete.

[0004] Therefore, how to provide a drill-and-blast tunnel assembled UHPC lining structure that can achieve rapid construction and improve the technical effect of the safety and durability of the secondary lining structure is a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0005] In view of the problems of insufficient vault thickness and strength often occurring in the on-site cast secondary lining in the prior art, a drill-and-blast tunnel assembled UHPC lining structure is provided, which enables rapid construction and improves the technical effect of the safety and durability of the secondary lining structure.

[0006] To achieve the above-mentioned object, the present invention provides a drill-and-blast tunnel assembled UHPC lining structure, the drill-and-blast tunnel assembled UHPC lining structure comprising: a plurality of UHPC lining units, each of which is an arc-shaped structure; a plurality of longitudinal connecting units, each of which is fixedly connected to any two adjacent UHPC lining units; and a plurality of annular sealing rubber units, each of which is laid on the annular side surface of a corresponding UHPC lining unit.

[0007] In the first aspect, each of the UHPC lining units comprises: a plurality of waffle plate-type UHPC lining segments, each of the waffle plate-type UHPC lining segments comprises a UHPC segment, and four stiffening ribs symmetrically arranged in pairs along the four peripheries of one side of the UHPC segment, and the UHPC segment has an arc-shaped structure; a plurality of bolt holes are evenly arranged on the four stiffening ribs; a plurality of circumferential connecting bolts, each of the circumferential connecting bolts passes through the corresponding bolt hole in the circumferential direction to fix and connect any two adjacent waffle plate-type UHPC lining segments; a plurality of longitudinal sealing rubber pads, each of the longitudinal sealing rubber pads is laid on the longitudinal side of a corresponding UHPC segment.

[0008] In the first aspect, each of the longitudinal connection units includes a plurality of longitudinal connection bolts, and each of the longitudinal connection bolts passes through the corresponding bolt hole in the longitudinal direction to fix and connect any two adjacent waffle plate-type UHPC lining segments.

[0009] In the first aspect, each of the annular sealing rubber units includes a plurality of annular sealing rubber pads, and each of the annular sealing rubber pads is laid on the annular side surface of a corresponding UHPC segment.

[0010] In the first aspect, a plurality of reserved grouting holes are arranged at the circumferential centerline position of each of the UHPC segments.

[0011] In the first aspect, each of the waffle plate type UHPC lining segments is prepared by factory prefabrication of UHPC.

[0012] In the first aspect, the plurality of annular sealing rubber pads and the plurality of longitudinal sealing rubber pads are all made of EPDM rubber.

[0013] The present invention also provides a construction method for a drill-and-blast tunnel assembled UHPC lining structure, which is used for the construction of the above-mentioned drill-and-blast tunnel assembled UHPC lining structure, and the construction method comprises: excavating the tunnel, supporting the initial construction, and setting a waterproof layer according to the design and construction technical requirements; constructing an invert and a concrete floor according to the construction safety step requirements of the tunnel, and setting key grooves connected to the waffle plate type UHPC lining segments on both sides of the invert and the concrete floor; at the tunnel construction site, laying annular sealing rubber pads and longitudinal sealing rubber pads on the sides of the waffle plate type UHPC lining segments to ensure the waterproof layer. Ensure that the sealing gasket is firmly adhered to the waffle plate type UHPC lining segment; transport the waffle plate type UHPC lining segment with the sealing gasket into the tunnel, assemble the waffle plate type UHPC lining segments symmetrically from bottom to top in the circumferential direction, and assemble the UHPC lining units from inside to outside in the longitudinal direction. After each waffle plate type UHPC lining segment is assembled, use longitudinal connecting bolts and circumferential connecting bolts to respectively connect the two adjacent waffle plate type UHPC lining segments longitudinally and circumferentially; pump foam concrete into the gap between the waffle plate type UHPC lining segment and the waterproof layer through the reserved grouting holes for filling.

[0014] In the second aspect, the density of the foamed concrete is 300-500 kg / m 3 .

[0015] In the second aspect, the construction method also includes prefabricating UHPC lining segments before construction, and the prefabricating UHPC lining segments includes: determining the scheme of the waffle plate type UHPC lining segments according to the design, tying the steel skeleton cage, and strengthening the reinforcement at the bolt hole position; assembling the templates of the waffle plate type UHPC lining segments and sealing the joints to obtain the casting template of the waffle plate type UHPC lining segments; preparing UHPC, casting UHPC in the casting template, coating with a film to keep it moist after the casting is completed and using high-temperature steam curing; demolding after the high-temperature steam curing is completed to obtain a preliminary waffle plate type UHPC lining segment, and performing post-curing on the preliminary waffle plate type UHPC lining segment to reduce the shrinkage and cracking of the segment caused by water loss of UHPC. After the post-curing is completed, the finished waffle plate type UHPC lining segment is obtained, and quality inspection is performed. After passing the inspection, it is stored for standby use.

[0016] Beneficial effects:

[0017] In the present invention, the drill-and-blast tunnel assembled UHPC lining structure is obtained by laying a plurality of UHPC lining units 1 along the tunnel from the inside to the outside, and any two adjacent UHPC lining units 1 are fixedly connected by a longitudinal connection unit. At the same time, an annular sealing rubber pad 15 is laid on the annular side of each UHPC lining unit 1 to seal the connection between any two adjacent UHPC lining units 1, so as to better fill the space between the UHPC lining unit 1 and the waterproof layer with foam concrete in the later stage, avoid cavities, and improve the safety and durability of the secondary lining structure; a plurality of UHPC lining units 1 are laid together to form a plurality of UHPC lining units 1. The masonry unit 1 is directly assembled on site in the tunnel, which can significantly improve the efficiency of secondary lining construction, shorten the construction period, reduce the number of workers, and help improve the mechanized and intelligent construction technology level of the tunnel; at the same time, the UHPC lining unit 1 is made of UHPC. Compared with the lining structure assembled with ordinary concrete, the UHPC lining unit 1 made of UHPC can be reduced in thickness by more than half under the same bearing capacity conditions, which can reduce the amount of secondary lining concrete, significantly reduce the weight of the UHPC lining unit, and greatly reduce the technical requirements for the lifting capacity of the assembly equipment, which is convenient for on-site implementation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the assembled UHPC lining structure of the tunnel using the drill and blast method of the present invention;

[0020] Figure 2 It is a schematic structural diagram of the UHPC lining unit of the present invention;

[0021] Figure 3 is a schematic front view of the structure of the UHPC lining unit of the present invention;

[0022] Figure 4 The present invention Figure 3 Schematic diagram of the cross section along the AA direction;

[0023] Figure 5 It is a development diagram of the inner curved surface structure of the UHPC lining unit of the present invention;

[0024] Figure 6 It is a partial schematic diagram of the bolt connection of the longitudinal side edges and the circumferential side edges of two waffle plate-type UHPC lining segments adjacent in the longitudinal and circumferential directions of the present invention.

[0025] Reference numerals:

[0026] 1. UHPC lining unit; 11. Waffle plate type UHPC lining segment; 111. UHPC segment; 112. Stiffening rib; 12. Circumferential connecting bolts; 13. Longitudinal sealing rubber pad; 14. Longitudinal connecting bolts; 15. Circumferential sealing rubber pad; 16. Reserved grouting hole; 17. Bolt hole;

[0027] 2. Concrete base plate;

[0028] 1101. Left arch foot waffle plate type UHPC lining segment; 1102. Left arch shoulder waffle plate type UHPC lining segment; 1103. Arch crown waffle plate type UHPC lining segment; 1104. Right arch shoulder waffle plate type UHPC lining segment; 1105. Right arch foot waffle plate type UHPC lining segment. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of this specification to clearly and completely describe the technical solutions in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0030] Embodiment 1

[0031] like Figures 1 to 6 As shown, the first embodiment provides a drill-and-blast tunnel assembled UHPC lining structure, the drill-and-blast tunnel assembled UHPC lining structure comprising: a plurality of UHPC lining units 1, each of the UHPC lining units 1 being an arc-shaped structure; a plurality of longitudinal connecting units, each of the longitudinal connecting units fixedly connecting any two adjacent UHPC lining units 1; a plurality of annular sealing rubber units, each of the annular sealing rubber units being laid on the annular side surface of a corresponding UHPC lining unit 1.

[0032] In the present invention, the drill-and-blast tunnel assembled UHPC lining structure is obtained by laying a plurality of UHPC lining units 1 along the tunnel from the inside to the outside, and any two adjacent UHPC lining units 1 are fixedly connected by a longitudinal connection unit. At the same time, an annular sealing rubber pad 15 is laid on the annular side of each UHPC lining unit 1 to seal the connection between any two adjacent UHPC lining units 1, so as to better fill the space between the UHPC lining unit 1 and the waterproof layer with foam concrete in the later stage, avoid cavities, and improve the safety and durability of the secondary lining structure; a plurality of UHPC lining units 1 are laid together to form a plurality of UHPC lining units 1. The masonry unit 1 is directly assembled on site in the tunnel, which can significantly improve the efficiency of secondary lining construction, shorten the construction period, reduce the number of operators, and help improve the mechanized and intelligent construction technology level of the tunnel; at the same time, the UHPC lining unit 1 is made of UHPC. Compared with the lining structure assembled with ordinary concrete, the thickness of the UHPC lining unit 1 made of UHPC can be reduced by more than half under the same bearing capacity conditions, which can reduce the amount of secondary lining concrete, significantly reduce the weight of the UHPC lining unit, and greatly reduce the technical requirements for the lifting capacity of the assembly equipment, which is convenient for on-site implementation; Figure 1 It is a schematic diagram of the assembled UHPC lining structure of a tunnel using the drill and blast method of the present invention when there are three UHPC lining units 1.

[0033] In some possible implementations, each of the UHPC lining units 1 includes: a plurality of waffle plate-type UHPC lining segments 11, each of the waffle plate-type UHPC lining segments 11 includes a UHPC segment 111, and four stiffening ribs 112 symmetrically arranged in pairs along the four peripheries of one side of the UHPC segment 111, and the UHPC segment 111 is an arc-shaped structure; a plurality of bolt holes 17 are evenly arranged on the four stiffening ribs 112; a plurality of circumferential connecting bolts 12, each of the circumferential connecting bolts 12 passes through the corresponding bolt hole 17 in the circumferential direction to fix and connect any two adjacent waffle plate-type UHPC lining segments 11; and a plurality of longitudinal sealing rubber pads 13, each of the longitudinal sealing rubber pads 13 is laid on the longitudinal side of a corresponding UHPC segment 111.

[0034] Specifically, each UHPC lining unit 1 is composed of a plurality of waffle plate type UHPC lining segments 11 spliced ​​into an annular arc shape, and any two waffle plate type UHPC lining segments 11 are fixedly connected by annular connecting bolts 12; each waffle plate type UHPC lining segment 11 includes a UHPC segment 111, and the UHPC segment 111 is in an arc-shaped structure. Annular sealing rubber pads 15 and longitudinal sealing rubber pads 13 are respectively laid on the annular side and longitudinal side of the UHPC segment 111, so that the connection between the two adjacent waffle plate type UHPC lining segments 11 is sealed, so as to facilitate the later better filling of foam concrete between the waffle plate type UHPC lining segment 11 and the waterproof layer to avoid cavities. The safety and durability of the secondary lining structure are improved, and at the same time, the structural stability of the waffle plate UHPC lining segment 11 after being assembled along the inner wall of the tunnel is increased, and the overall bending resistance of the waffle plate UHPC lining segment 11 is enhanced; in addition, each waffle plate UHPC lining segment 11 also includes four stiffening ribs 112 symmetrically arranged in pairs along the four peripheries of one side of the UHPC segment 111. The arrangement of the stiffening ribs 112 makes it convenient to set bolt holes 17 on the stiffening ribs 112, so that when any two waffle plate UHPC lining segments 11 are spliced ​​and fixedly connected, the longitudinal sealing rubber pad 13 is clamped between the two connected stiffening ribs 112, thereby enhancing the overall bending resistance of the waffle plate UHPC lining segment 11. force; the UHPC segments 111 and the stiffening ribs 112 constitute a waffle plate type UHPC with a waffle plate structure, and the bolt holes 17 are arranged on the stiffening ribs 112, which effectively solves the influence of the bolt holes 17 on the overall thickness of the waffle plate type UHPC lining segments 11, makes the setting of the bolt holes 17 more convenient, and enhances the overall bending resistance of the waffle plate type UHPC lining segments 11; the number of waffle plate type UHPC lining segments 11 of a UHPC lining unit 1 is set according to the size of the tunnel as required, and it can be considered that the waffle plate type UHPC lining segments 11 are set in blocks according to the inner contour of the tunnel. For example, when the number of waffle plate type UHPC lining segments 11 required according to the inner contour of the tunnel is set to 5, it can be obtained that each The center angle of each waffle plate type UHPC lining segment 11 is 44.667°. The assembled UHPC lining segment unit 1 is respectively a left arch foot waffle plate type UHPC lining segment 1101, a left arch shoulder waffle plate type UHPC lining segment 1102, a vault waffle plate type UHPC lining segment 1103, a right arch shoulder waffle plate type UHPC lining segment 1104 and a right arch foot waffle plate type UHPC lining segment 1105 from left to right. During assembly, the waffle plate type UHPC lining segments 11 are symmetrically assembled from bottom to top in the circumferential direction (1101-1105-1102-1104-1103), and finally the vault waffle plate type UHPC lining segment 1103 is inserted into a ring.

[0035] In some possible implementations, each of the longitudinal connection units includes a plurality of longitudinal connection bolts 14, and each of the longitudinal connection bolts 14 passes through the corresponding bolt holes 17 in the longitudinal direction to fix and connect any two adjacent waffle plate-type UHPC lining segments 11; each of the annular sealing rubber units includes a plurality of annular sealing rubber pads 15, and each of the annular sealing rubber pads 15 is laid on the annular side surface of a corresponding UHPC segment 111.

[0036] Specifically, when assembling the waffle plate UHPC lining segments 11 in the longitudinal direction of the tunnel, the longitudinal connecting bolts pass through the bolt holes 17 on the circumferential stiffening ribs 112 of the waffle plate UHPC lining segments 11, and the two adjacent waffle plate UHPC lining segments 11 are fixedly connected in the longitudinal direction; the annular sealing rubber pad is laid on the circumferential side of the UHPC segment 111, so that the annular sealing rubber pad 15 is located between the two adjacent stiffening ribs 112, so as to seal the connection between the two adjacent waffle plate UHPC lining segments 11, and increase the sealing performance. The overall bending resistance of the waffle plate UHPC lining segment 11 is strengthened. At the same time, the laying of the annular sealing rubber pad 15 makes the connection between two adjacent waffle plate UHPC lining segments 11 sealed, which is convenient for the later period to better fill the foam concrete between the waffle plate UHPC lining segment 11 and the waterproof layer to avoid cavities and improve the safety and durability of the secondary lining structure; the waffle plate UHPC lining segment 11 is assembled along the longitudinal direction of the tunnel. The number of UHPC lining units 1 is related to the length of the tunnel. When the number of UHPC lining units 1 is 3, such as Figure 1 As shown, in the circumferential direction, two adjacent waffle plate type UHPC lining segments 11 are fixedly connected by circumferential connecting bolts 12 , and in the longitudinal direction, two adjacent waffle plate type UHPC lining segments 11 are fixedly connected by longitudinal connecting bolts 14 .

[0037] In some possible implementations, a plurality of reserved grouting holes 16 are arranged at the circumferential centerline position of each of the UHPC segments 111 .

[0038] Specifically, the reserved grouting holes 16 are used to inject foamed concrete into the gap between the waffle plate type UHPC lining segment 11 and the waterproof layer of the inner side wall of the tunnel.

[0039] In some possible implementations, each of the waffle plate-type UHPC lining segments 11 is prefabricated in a UHPC factory; the plurality of the annular sealing rubber pads 15 and the plurality of the longitudinal sealing rubber pads 13 are all made of EPDM rubber.

[0040] Specifically, the waffle plate type UHPC lining segment 11 is prepared by UHPC one-piece molding. Under the same bearing capacity conditions, the thickness of the waffle plate type UHPC lining segment 11 can be reduced by more than 50%, reducing the amount of secondary lining concrete, thereby significantly reducing the weight of the segment, greatly reducing the technical requirements for the lifting capacity of the assembly equipment, and facilitating on-site implementation; in addition, compared with the cast-in-place concrete lining structure, the assembly after prefabrication can fundamentally solve the problem of insufficient thickness or strength of the vault concrete, avoid cracking or falling damage to the tunnel lining structure, and ensure the safe operation of the tunnel; in addition, the waffle plate type UHPC lining segment 11 is centrally prefabricated in the factory and directly assembled on site, which can significantly improve the construction efficiency of the secondary lining, shorten the construction period, and reduce the number of workers, which is helpful to improve the mechanized and intelligent construction technology level of the tunnel.

[0041] Embodiment 2

[0042] like Figures 1 to 6 As shown, the second embodiment of the present invention provides a construction method of a drill-and-blast tunnel assembled UHPC lining structure, which is used for the construction of a drill-and-blast tunnel assembled UHPC lining structure described in the first embodiment, and is characterized in that the construction method comprises: excavating the tunnel, carrying out initial support construction and setting a waterproof layer according to the design and construction technical requirements; constructing an invert and a concrete floor according to the construction safety step requirements of the tunnel, and setting key grooves connected to the waffle plate type UHPC lining segments on both sides of the invert and the concrete floor; at the tunnel construction site, laying annular sealing rubber pads and longitudinal sealing rubber pads on the sides of the waffle plate type UHPC lining segments respectively to ensure the The sealing gasket is firmly adhered to the waffle plate UHPC lining segment; the waffle plate UHPC lining segment provided with the sealing gasket is transported into the tunnel, the waffle plate UHPC lining segment is symmetrically assembled from bottom to top in the circumferential direction, and assembled from inside to outside in the longitudinal direction with UHPC lining units. After each waffle plate UHPC lining segment is assembled, the two adjacent waffle plate UHPC lining segments are longitudinally fixedly connected and circumferentially fixedly connected by longitudinal connecting bolts and circumferential connecting bolts respectively; the gap between the waffle plate UHPC lining segment and the waterproof layer is filled with foam concrete through the reserved grouting holes; the density of the foam concrete is 300-500kg / m 3 .

[0043] Specifically, the number of waffle plate UHPC lining segments 11 and the corresponding center angles in a UHPC lining unit 1 are related to the inner contour of the tunnel. The waffle plate UHPC lining segments 11 are divided into blocks according to the inner contour of the tunnel. The waffle plate UHPC lining segments 11 in each UHPC lining unit 1 are of the same size. The number of UHPC lining units 1 is related to the length of the tunnel. Before assembling and assembling the waffle plate UHPC lining segments 11, it is necessary to excavate the tunnel, provide initial support for construction, and set a waterproof layer as required. At the same time, keyways connected to the waffle plate UHPC lining segments 11 are set on both sides of the tunnel invert and the concrete bottom plate 2 to facilitate the assembly of the waffle plate UHPC lining segments 11, thereby improving the stability of the drill-and-blast tunnel assembled UHPC lining structure after assembly. The sides of the waffle plate UHPC lining segments Annular sealing rubber pads and longitudinal sealing rubber pads are laid, wherein the annular sealing rubber pads 15 and the longitudinal sealing rubber pads 13 are laid on the annular side and the longitudinal side of the UHPC segment 111 respectively, so that when the two adjacent waffle plate type UHPC lining segments 11 are fixedly connected by the longitudinal connecting bolts 14 or the annular connecting bolts 12, the annular sealing rubber pads 15 and the longitudinal sealing rubber pads 13 are clamped between the two adjacent waffle plate type UHPC lining segments 11 to seal the connection; after the waffle plate type UHPC lining segments 11 are assembled, the gaps between the waffle plate type UHPC lining segments 11 and the waterproof layer are filled with foam concrete through the reserved grouting holes 16 to enhance the tight connection between the waffle plate type UHPC lining segments 11 and the waterproof layer, avoid cracking or falling damage of the drill and blast tunnel assembled UHPC lining structure, and ensure the safe operation of the tunnel. The waffle plate type UHPC lining segment 11 used in the present invention is prefabricated. Compared with the cast-in-place concrete lining structure, it can fundamentally solve the problem of insufficient thickness or strength of the vault concrete, further avoid cracking or falling damage of the drilled and blasted tunnel assembled UHPC lining structure, and ensure the safe operation of the tunnel. It should be noted that the construction method of a drilled and blasted tunnel assembled UHPC lining structure improved in this embodiment is used for the construction of a drilled and blasted tunnel assembled UHPC lining structure in the embodiment, so the performance principle of the drilled and blasted tunnel assembled UHPC lining structure will not be repeated here, and the undetailed part can be referred to the embodiment one.

[0044] In some possible implementations, the construction method further includes prefabricating UHPC lining segments before construction, and the prefabricating UHPC lining segments includes: determining the scheme of the waffle plate type UHPC lining segments according to the design, tying the steel skeleton cage, and strengthening the reinforcement at the bolt hole position; assembling the templates of the waffle plate type UHPC lining segments and sealing the joints to obtain the casting template of the waffle plate type UHPC lining segments; preparing UHPC, casting UHPC in the casting template, coating with a film to keep it moist after casting and using high-temperature steam curing; demolding after the high-temperature steam curing is completed to obtain a preliminary waffle plate type UHPC lining segment, and performing post-curing on the preliminary waffle plate type UHPC lining segment to reduce the shrinkage and cracking of the segment due to water loss of UHPC; after the post-curing is completed, a finished waffle plate type UHPC lining segment is obtained, and a quality inspection is performed, and after passing the inspection, it is stored for standby use.

[0045] Specifically, the steel bars are tied according to the waffle plate type UHPC lining segment 11 scheme determined by the design, wherein the steel bars are processed according to the material size in the factory, and are numbered, and tied into a steel skeleton cage in the order of the numbers, and their line type and position must be strictly controlled, and the reinforcement is strengthened at the bolt hole 17 position; then the formwork is installed, the manufactured and processed waffle plate type lining segment 11 formwork is assembled, and the joints of the formwork are sealed with sealing tape or the like; then concrete is poured to prepare ultra-high performance concrete, which is UHPC, and the concrete is poured into the formwork, and the pouring process is guaranteed to be completed continuously in one go, and no cold pouring shall occur. seam; followed by high-temperature steaming, after the waffle plate type UHPC lining segment 11 is poured, it is coated with a film to keep moisture, and is cured by high-temperature steam curing. After the high-temperature steaming curing is completed, the mold is demoulded for later curing, which can be cured in water, sprayed or sprayed with a curing agent to reduce the shrinkage and cracking of the segment caused by water loss of concrete; finally, the prefabricated waffle plate type UHPC lining segment 11 is tested, and stored for standby after passing the test. At the same time, 1 to 3 pieces of qualified waffle plate type UHPC lining segments 11 can be selected for pre-assembly, and the waffle plate type UHPC lining segments 11 are stored in groups after the pre-assembly is completed.

[0046] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A drill-and-blast tunnel assembly type UHPC lining structure, characterized in that: The drill and blast tunnel assembled UHPC lining structure comprises: A plurality of UHPC lining units (1), each of the UHPC lining units (1) being of an arc-shaped structure; A plurality of longitudinal connection units, each of which is configured to fixedly connect any two adjacent UHPC lining units (1); A plurality of annular sealing rubber units, each of which is laid on the annular side surface of a corresponding UHPC lining unit (1).

2. The drill-and-blast tunnel assembly type UHPC lining structure according to claim 1, characterized in that: Each of the UHPC lining units (1) comprises: A plurality of waffle plate-shaped UHPC lining segments (11), each of the waffle plate-shaped UHPC lining segments (11) comprising a UHPC segment (111) and four stiffening ribs (112) symmetrically arranged in pairs along four peripheries of one side of the UHPC segment (111), the UHPC segment (111) being an arc-shaped structure; a plurality of bolt holes (17) are evenly arranged on the four stiffening ribs (112); A plurality of annular connecting bolts (12), each of the annular connecting bolts (12) passing through the corresponding bolt hole (17) in the annular direction to fixedly connect any two adjacent waffle plate type UHPC lining segments (11); A plurality of longitudinal sealing rubber pads (13), each of the longitudinal sealing rubber pads (13) being laid on a longitudinal side surface of a corresponding UHPC segment (111).

3. The drill-and-blast tunnel assembly type UHPC lining structure according to claim 2, characterized in that: Each of the longitudinal connection units comprises a plurality of longitudinal connection bolts (14), and each of the longitudinal connection bolts (14) passes through the corresponding bolt hole (17) in the longitudinal direction to fixedly connect any two adjacent waffle plate-type UHPC lining segments (11).

4. The drill-and-blast tunnel assembly type UHPC lining structure according to claim 3, characterized in that: Each of the annular sealing rubber units comprises a plurality of annular sealing rubber pads (15), and each of the annular sealing rubber pads (15) is laid on the annular side surface of a corresponding UHPC segment (111).

5. The drill-and-blast tunnel assembly type UHPC lining structure according to claim 4, characterized in that: A plurality of reserved grouting holes (16) are arranged at the circumferential centerline position of each of the UHPC segments (111).

6. The drill-and-blast tunnel assembly type UHPC lining structure according to claim 5, characterized in that: Each of the waffle plate-type UHPC lining segments (11) is prepared by factory prefabrication of UHPC.

7. The drill-and-blast tunnel assembly type UHPC lining structure according to claim 6, characterized in that: The plurality of annular sealing rubber pads (15) and the plurality of longitudinal sealing rubber pads (13) are all made of EPDM rubber.

8. A construction method for a drill-and-blast tunnel assembly type UHPC lining structure, the construction method being used for the construction of any one of claims 1 to 7 of a drill-and-blast tunnel assembly type UHPC lining structure, characterized in that: The construction method comprises: Carry out tunnel excavation, initial construction support and installation of waterproof layer in accordance with design and construction technical requirements; According to the construction safety step requirements of the tunnel, the invert arch and the concrete bottom plate are constructed, and keyways connected to the waffle plate type UHPC lining segments are provided on both sides of the invert arch and the concrete bottom plate; At the tunnel construction site, circumferential sealing rubber pads and longitudinal sealing rubber pads are respectively laid on the sides of the waffle plate type UHPC lining segments to ensure that the sealing pads are firmly adhered to the waffle plate type UHPC lining segments; The waffle plate type UHPC lining segments provided with the sealing gaskets are transported into the tunnel, the waffle plate type UHPC lining segments are symmetrically assembled from bottom to top in the circumferential direction, and the UHPC lining units are assembled from inside to outside in the longitudinal direction. After each waffle plate type UHPC lining segment is assembled, two adjacent waffle plate type UHPC lining segments are longitudinally fixedly connected and circumferentially fixedly connected respectively by longitudinal connecting bolts and circumferential connecting bolts; The foamed concrete is pumped into the gap between the waffle plate type UHPC lining segment and the waterproof layer through the reserved grouting holes for filling.

9. The construction method of a tunnel assembly type UHPC lining structure by drill and blast method as claimed in claim 8, characterized in that: The density of the foamed concrete is 300-500 kg / m 3 .

10. The construction method of a tunnel assembly type UHPC lining structure by drill and blast method as claimed in claim 9, characterized in that: The construction method further comprises prefabricating UHPC lining segments before construction, wherein the prefabricated UHPC lining segments comprise: According to the design, the waffle plate type UHPC lining segment scheme is determined, the steel skeleton cage is tied, and the reinforcement is strengthened at the bolt hole position; Assembling the templates of the waffle plate type UHPC lining segment and sealing the joints to obtain the casting template of the waffle plate type UHPC lining segment; Prepare UHPC, cast UHPC in the casting template, and after casting, cover with a film to keep moisture and use high-temperature steam for curing; After high-temperature steam curing, demoulding is performed to obtain the initial waffle plate UHPC lining segment, and the initial waffle plate UHPC lining segment is subjected to later curing to reduce the shrinkage and cracking of the segment caused by water loss of UHPC; After the post-maintenance, the finished waffle plate UHPC lining segments are obtained and quality tested. After passing the test, they are stored for future use.

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