Arrayed rectangular tunnel structure and construction method for forming underground space interconnection

Abstract

Array type rectangular tunnel structure and construction method for forming underground space interconnection. It relates to the technical field of underground engineering. It comprises at least two tunnel groups, each tunnel group comprises at least two layers of tunnels, the upper layer of each tunnel group is a rectangular pipe section A, and the lower layer is a rectangular pipe section B, the top of the rectangular pipe section B is provided with a plurality of guide rails, the guide rails are connected with embedded parts in the rectangular pipe section B, and the guide rails are used for guiding during the jacking implementation of the rectangular pipe section A; each tunnel comprises a plurality of rectangular pipe sections connected in sequence, the rectangular pipe section is a prefabricated reinforced concrete structure, a plurality of grouting holes are reserved on the rectangular pipe section, and the rectangular pipe section is externally pressure injected with resistance reducing mud or solidified slurry through the grouting holes. The method is environment-friendly, effectively solves the problems of mechanical replacement of manual operation and construction safety in construction means.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of underground engineering, and in particular to an array type rectangular tunnel structure and a construction method for forming underground space interconnection. BACKGROUND

[0002] With the gradual expansion of the development and utilization scale of urban underground space in China, vigorously developing underground space is an important means to effectively alleviate the problems of urban land resource shortage and "big city disease". In the future, a large number of underground spaces such as underground commercial streets, underground garages, underground entertainment venues, underground hotels, underground shelter hospitals, etc. are in urgent need of construction. Moreover, the interconnection between the above underground spaces and existing or newly built basements, such as the interconnection between two commercial plots, the interconnection between residential communities and commercial plazas, the interconnection between subway stations and commercial plazas, the interconnection between two adjacent subway stations, etc. are in urgent need of development. After the interconnection of adjacent plots, a large number of passenger flows can be directly introduced into commercial plazas through subways and residential communities, effectively promoting economic development and also promoting industry development.

[0003] In order to be able to connect existing or newly built underground spaces in a large area and form a network, so that the functions of the existing or newly built underground spaces can be better played or extended, requirements are put forward for the cross-sectional size of the connecting tunnel, that is, the cross-sectional area needs to be expanded for connection according to the original underground space, and the cross-sectional area is usually more than 100 square meters, otherwise the use function will be limited.

[0004] In addition, when two adjacent underground spaces are connected by a tunnel, many engineering nodes will be encountered, such as underpassing urban trunk roads, underpassing river channels, underpassing railways, overpassing subway lines, passing through viaducts, passing through old urban areas, encountering difficult land acquisition and demolition sections, and complex underground pipelines, etc. The construction of these engineering nodes has strict requirements on ground deformation control, pipeline protection, protection of existing structures, etc., and the geological conditions are complex, with great construction risks and difficulties. In the prior art, the mine method, box culvert jacking method, and mechanical method of rectangular jacking can be used for construction.

[0005] Among them, the mine method construction reduces the construction risk through the auxiliary measures of stratum reinforcement (such as freezing method, grouting method, etc.), but the reinforcement effect is difficult to control due to the influence of many factors, and the construction period is uncontrollable. In addition, the mine method excavation process is also relatively complex, the quality is difficult to guarantee, skilled workers are needed for operation, and there is a great safety hazard for personnel exposed to the outside.

[0006] Box culvert jacking method construction, due to the site pouring box culvert structure required work well site larger, for the bustling city, land resources are tight, difficult to meet the requirements of the site pouring construction, and the required period is longer. In addition, the process of construction, the face open excavation of strata disturbance is larger, especially in close proximity to the pipeline, railway, subway lines and other deformation control requirements very strict section, the settlement is uncontrollable; when the adverse geology, artificial excavation safety risk doubled.

[0007] And mechanical method rectangular pipe jacking technology has no need for artificial exposure operation, high degree of mechanization, safety, prefabricated structure once forming, construction speed, strata adaptability, small strata disturbance, settlement control, required work well site small, no need to close traffic, no need to move the pipeline, the impact on the urban environment is small, can be parallel jacking or overlapping jacking construction and other advantages, gradually become one of the bustling city shallow underground space construction preferred method.

[0008] In summary, there are many existing "isolated" underground space in the city, so that the use of underground space resources has great limitations. Therefore, how to use the existing or newly built underground structure, under the premise of ensuring the original function of underground space, the underground space between the two adjacent plots is interconnected is the problem currently facing. SUMMARY

[0009] The present application is directed to the above problems, a simple structure, convenient expansion, high reliability, can ensure the original function of underground space under the premise of realizing the intercommunication between adjacent plots array rectangular tunnel structure and the construction method for forming underground space interconnection.

[0010] The technical scheme of the present application is: array rectangular tunnel structure, including at least two columns of tunnel groups, each column of tunnel groups includes at least two layers of tunnels, the upper layer of each column of tunnel groups is a rectangular pipe section A, and the lower layer is a rectangular pipe section B,

[0011] The top of the rectangular pipe section B is provided with a plurality of guide rails, the guide rails are connected with the embedded parts in the rectangular pipe section B, and the guide rails are used for guiding in the jacking implementation process of the rectangular pipe section A;

[0012] Each tunnel includes a plurality of rectangular pipe sections connected in sequence, the rectangular pipe sections are prefabricated reinforced concrete structures,

[0013] A plurality of grouting holes are reserved on the rectangular pipe sections, and the grouting holes are used for pressure injection of resistance reducing mud or solidifying slurry outside the rectangular pipe sections.

[0014] The construction method for forming underground space interconnection by using array rectangular tunnel structure includes the following steps:

[0015] S1, work well construction:

[0016] The open cut method is used to construct the foundation pits at both ends of the arrayed tunnel as the starting shaft and receiving shaft. After the foundation pits are excavated to the design elevation, the foundation pit bottom plate and the lining wall structure are constructed, the portal structure of each tunnel is constructed, and the soil outside the portal is reinforced;

[0017] S2, rectangular tunnel construction:

[0018] The mechanical method of rectangular pipe jacking is used. The same layer is sequentially jacked from the middle to the sides, or sequentially jacked from left to right or right to left. Different layers are sequentially jacked from bottom to top. All tunnels are sequentially jacked to form an arrayed pipe jacking tunnel.

[0019] S3, soil reinforcement outside the tunnel:

[0020] After the construction of each pipe jacking tunnel is completed, the grouting hole is used to inject solidified slurry outside the rectangular pipe section, so that the soil outside the pipe jacking tunnel and between the pipe jacking tunnels is solidified to form a waterproof layer outside the pipe jacking tunnel.

[0021] S4, internal transverse connection construction of the pipe jacking tunnel:

[0022] After all the rectangular tunnels are constructed and grouted and reinforced, the side walls between adjacent rectangular pipe sections are completely or partially removed according to the engineering function, and the longitudinal beam and column structure is constructed to form an internally connected underground space structure.

[0023] S5, removal of temporary structures:

[0024] It includes the steel support platform structure used for the starting and receiving of the pipe jacking machine and the temporary steel support structure used for the stress conversion of the side wall of the pipe jacking tunnel when it is destroyed.

[0025] S6, connection with existing or newly built basement structure:

[0026] After the temporary structure is removed, it is connected with the existing or newly built underground structure at the end of the working shaft to form an interconnected underground space.

[0027] In step S2, before the tunnel construction, a pipe shed or pipe cover is constructed as an advanced support.

[0028] In step S2, it also includes:

[0029] (1) Before each pipe jacking tunnel is jacked, the structure conversion of the stress support in the working shaft is completed, the enclosure structure in the current pipe jacking tunnel portal range is removed, and the pipe jacking portal structure is completed.

[0030] (2) Before jacking of the upper layer pipe jacking tunnel, temporary steel support is first erected in the completed lower layer pipe jacking tunnel, and then temporary steel platform structure is respectively constructed in the launching shaft and the receiving shaft for launching and receiving of the upper layer pipe jacking tunnel;

[0031] (3) During jacking of each pipe jacking tunnel, grouting and resistance reduction and attitude control measures are taken; resistance reduction mud is injected into the pipe joint through the grouting hole;

[0032] (4) After normal receiving of each pipe jacking tunnel, the pipe jacking machine is hoisted out of the receiving shaft and transferred to the launching shaft for construction of the next pipe jacking tunnel, or the pipe jacking machine is transferred to the tunnel portal of the next pipe jacking tunnel in the receiving shaft and jacked in the direction of the launching shaft.

[0033] In step S2, prestressed holes are reserved when the rectangular pipe joint is prefabricated, and after completion of each pipe jacking tunnel, prestressed steel bars are inserted into the rectangular pipe joint by using prestressed tensioning technology, and then tensioning, anchoring, grouting and anchoring sealing are performed, and finally lock beam is constructed at both ends of the pipe jacking tunnel in the shaft to connect the pipe jacking tunnels into a whole force structure, and to improve the waterproof effect;

[0034] Among them, the pipe jacking tunnel located in the middle of each layer only inserts prestressed steel bars in the top plate and the bottom plate, and the pipe jacking tunnel located at the outermost side inserts prestressed steel bars in the outermost side wall in addition to the top plate and the bottom plate.

[0035] In step S4,

[0036] (1) Before the side wall of the pipe jacking tunnel is broken, a temporary steel support structure is first constructed inside the side wall;

[0037] (2) After the adjacent side pipe jacking tunnels are broken through to form a stable interconnection structure, the temporary steel support structure is removed, and the side wall of the next adjacent side pipe jacking tunnel is broken down, until all or part of the side walls of the adjacent side pipe jacking tunnels are broken down, and the temporary support is removed in time after the beam-column structure is converted, and finally a stable interconnected underground space structure is formed;

[0038] (3) The side wall breaking and internal structure conversion construction of different layers of pipe jacking tunnels is carried out according to the principle of from top to bottom, and the same layer is carried out from left to right or from right to left horizontally and from the launching shaft to the receiving shaft vertically;

[0039] (4) The side wall breaking preferentially adopts the method of water drilling first and then rope saw cutting.

[0040] In step S5,

[0041] (1) After the internal conversion structure of the same layer pipe jacking tunnel meets the design requirements, the temporary support is removed according to the principle of first supporting and then removing, and then supporting and then removing, from the launching shaft to the receiving shaft or in the opposite direction;

[0042] (2) Different layers are removed in the following order: first, the temporary steel support structure inside the upper tunnel; second, the temporary steel platform in the working well for the upper pipe jacking tunnel; third, the internal structure of the lower pipe jacking tunnel; and finally, all temporary structures in the lower pipe jacking tunnel are removed, forming a complete array pipe jacking tunnel, which is connected to the existing or newly built underground structures at both ends to form an interconnected underground space structure.

[0043] According to the engineering characteristics and the construction period, when two pipe jacking tunnels are selected for simultaneous construction, the two tunnels need to be spaced apart, and the erection and removal of the temporary steel structure need to be coordinated.

[0044] According to the engineering characteristics and construction conditions, when there is no condition for constructing the receiving well on the ground, the pipe jacking machine is advanced to the design position of the receiving end, the shell is discarded in place inside the pipe jacking tunnel, all components of the pipe jacking machine are removed and transported to the launching well, the steel shell of the pipe jacking machine is retained as the primary support structure, the secondary lining and waterproof structure are constructed inside the shell, and the shell is poured into a whole with the pipe jacking tunnel structure that has been advanced. The removed pipe jacking components only need to be processed and restored to a complete pipe jacking machine for subsequent pipe jacking tunnel construction.

[0045] According to the engineering requirements, the pipe jacking tunnel group can be connected to the existing or newly built underground structures in whole or in part to achieve interconnection between two adjacent plots.

[0046] According to the engineering characteristics and construction conditions, when there is no condition for constructing the launching well and receiving well on the ground, a horizontal passage is constructed at the position where the proposed pipe jacking tunnel is connected to the existing basement, and the pipe jacking machine is launched and received in the horizontal passage, or the position where the pipe jacking tunnel is connected to the existing basement meets the requirements for pipe jacking launching and receiving.

[0047] The horizontal passage for launching and receiving needs to be connected to the open-cut working well to meet the lifting and transportation requirements of the pipe jacking equipment and construction.

[0048] The horizontal passage is launched inside, and the launching end is connected to the receiving end to provide jacking force by using the top-pulling method.

[0049] After the construction of the pipe jacking passage is completed, the horizontal passage is laterally broken to connect to the existing or newly built underground structures to achieve interconnection between two adjacent plots.

[0050] This invention firstly employs precast reinforced concrete pipe sections to form multi-layered, multi-row pipe jacking tunnels during operation. Then, temporary supports are constructed within the jacking tunnels, sidewalls are removed, and the internal structure is cast-in-place, enabling safe and convenient interconnection between the array-like pipe jacking tunnel structures. Secondly, by connecting the two ends to existing or newly constructed underground structures, a large interconnected underground space is ultimately achieved between two adjacent plots, significantly enhancing or extending the functionality of existing or newly constructed underground spaces.

[0051] This invention offers an environmentally friendly method that effectively addresses issues such as replacing manual labor with machinery and ensuring construction safety. In terms of environmental adaptability, it solves problems related to limited land resources and work surfaces in bustling urban areas, proposing solutions for receiving abandoned structures or launching and receiving within cross passages. It innovatively achieves interconnection between underground spaces of two adjacent plots in complex urban environments, featuring simple structure, high speed, high safety, and low overall cost. It can not only achieve interconnection between newly constructed underground spaces but also between existing underground spaces, expanding and connecting the cross-sections of original underground spaces to unrestrict their functionality, laying a solid foundation for fully utilizing urban underground space resources. Attached Figure Description

[0052] Figure 1 This is a plan view of an array-type pipe jacking tunnel group.

[0053] Figure 2 This is a longitudinal section view of the lower-level pipe jacking tunnel construction.

[0054] Figure 3 This is a longitudinal section view of the upper-level pipe jacking tunnel construction.

[0055] Figure 4 This is a schematic diagram of a rectangular tube section.

[0056] Figure 5 Construction sequence of array-type pipe jacking tunnel Figure 1 ,

[0057] Figure 6 Construction sequence of array-type pipe jacking tunnel Figure 2 ,

[0058] Figure 7 Construction sequence of array-type pipe jacking tunnel Figure 3 ,

[0059] Figure 8 Construction sequence of array-type pipe jacking tunnel Figure 4 ,

[0060] Figure 9 This is a schematic diagram of prestressing tensioning in an array-type pipe jacking tunnel.

[0061] Figure 10This is a diagram showing the demolition of the sidewalls and temporary support structure of the upper-level pipe jacking tunnel.

[0062] Figure 11 This document shows the construction of beams and columns and the dismantling of supports within the upper-level pipe jacking tunnel, as well as the demolition of sidewalls and temporary support structures in the lower-level pipe jacking tunnel.

[0063] Figure 12 This is a schematic diagram showing the completion of beam and column construction and support removal within the lower-level pipe jacking tunnel.

[0064] Figure 13 This is an example of a connection between existing and newly constructed underground structures, showing a cross-sectional view of an array of pipe jacking tunnels forming an interconnected underground space.

[0065] Figure 14 This is a longitudinal section diagram illustrating an example of interconnected underground spaces formed by an array of pipe jacking tunnels, illustrating the connection between existing and newly constructed underground structures.

[0066] Figure 15 This is a schematic diagram of the structure for initiating and receiving signals within the transverse channel;

[0067] In the diagram, 1 is a rectangular pipe section, 2 is a grouting hole, 3 is a guide rail, 4 is an embedded part, 5 is a temporary steel support, 51 is temporary steel support A, 52 is temporary steel support B, 6 is a pipe curtain, 7 is a prestressed duct, 8 is a longitudinal beam, 9 is a column, 10 is rectangular pipe section A, 11 is rectangular pipe section B, 12 is the launching shaft, 13 is the receiving shaft, 14 is the foundation pit bottom slab, 15 is the launching temporary steel platform, 16 is the receiving temporary steel platform, 17 is the inner lining wall, 18 is the interlocking beam, 19 is the launching end transverse passage, and 20 is the receiving end transverse passage. Detailed Implementation

[0068] The present invention is as follows Figures 1-14 As shown, an array-type rectangular tunnel structure includes at least two rows of tunnels, each row of tunnels including at least two layers of tunnels. The upper layer of each row of tunnels is a rectangular tube section A10, and the lower layer is a rectangular tube section B11.

[0069] The top of the rectangular tube section B is provided with several guide rails 3, which are connected to the embedded parts 4 in the rectangular tube section B. The guide rails are used for guiding the rectangular tube section A during the jacking process.

[0070] Each tunnel section comprises several rectangular tube segments 1 connected in sequence, wherein the rectangular tube segments are prefabricated reinforced concrete structures.

[0071] The rectangular tube section 1 includes a top plate, a bottom plate, and a pair of side walls.

[0072] Several grouting holes 2 are reserved on the rectangular pipe section 1, and drag-reducing mud or solidifying slurry is injected into the outside of the rectangular pipe section through the grouting holes.

[0073] The friction resistance of jacking is reduced by injecting the resistance-reducing mud through the grouting hole. The solidified slurry is injected to the outside of the rectangular pipe section tunnel after the tunnel structure is formed.

[0074] In the working process of the application, prefabricated reinforced concrete pipe sections are jacked to form a multi-layer and multi-column jacking tunnel, temporary supports are installed in the jacking tunnel, the side walls are removed, and the internal structure is cast in situ, so that the arrayed jacking tunnel structures can be interconnected, and the underground large space between two adjacent plots can be interconnected by connecting the two ends with the existing or newly-built underground structures. This method not only effectively solves the problems of difficult close jacking of reinforced concrete structures, pipe section deformation coordination, and construction safety, but also provides a scheme of receiving or originating in the transverse channel when the working well construction is limited by ground conditions.

[0075] The construction method for forming an interconnected underground space by using an arrayed rectangular tunnel comprises the following steps:

[0076] S1, working well construction:

[0077] The foundation pits are used as the starting well 12 and the receiving well 13 by using the open excavation method at both ends of the proposed arrayed tunnel. After the foundation pit is excavated to the design elevation, the foundation pit bottom plate 14 and the inner lining wall 17 structure are constructed, the hole structure of each proposed tunnel is prepared, and the soil outside the hole is reinforced and treated;

[0078] S2, rectangular tunnel construction:

[0079] The mechanical method of rectangular jacking tunnel is used for construction. The same layer is jacked from the middle to the sides, or from left to right or from right to left, and the different layers are jacked from bottom to top. After all the tunnels are jacked in sequence, the arrayed jacking tunnel is formed.

[0080] S3, soil reinforcement outside the tunnel:

[0081] After the construction of each jacking tunnel is completed, the solidified slurry is injected to the outside of the rectangular pipe section through the grouting hole, so that the soil outside the jacking tunnel and between the jacking tunnels is solidified, and a waterproof layer is formed outside the jacking tunnel.

[0082] S4, transverse connection construction in the jacking tunnel:

[0083] After all the rectangular tunnels are constructed and grouted and reinforced, the side walls between adjacent rectangular pipe sections are completely or partially removed according to the engineering function, and the longitudinal beams 8 and the vertical columns 9 are constructed to form an internally interconnected underground space structure.

[0084] S5, removal of temporary structures:

[0085] The steel support platform structure for the launching and receiving of the pipe jacking machine and the temporary steel support structure for the stress conversion of the side wall of the pipe jacking tunnel when the side wall is broken (i.e. the temporary steel support 5, wherein the upper layer is provided with the temporary steel support A51 and the lower layer is provided with the temporary steel support B52);

[0086] S6, communication with the existing or newly built underground structure:

[0087] After the temporary structure is removed, the existing or newly built underground structure at the end of the working well is connected to form an interconnected underground space.

[0088] In step S2, before the tunnel pipe jacking construction, according to the tunnel structure depth, geological conditions, underground pipeline protection, road surface settlement control, and other protection requirements of existing structures, a pipe shed or pipe cover 6 can be constructed as an advanced support to reduce the disturbance of the pipe jacking construction to the upper soil.

[0089] In step S2, it also includes:

[0090] (1) Before each section of the pipe jacking tunnel is jacked, the structure conversion of the stress support in the working well is completed, the surrounding structure in the current proposed pipe jacking tunnel portal range is removed, and the pipe jacking portal structure and water stop device installation are completed.

[0091] (2) Before the upper pipe jacking tunnel is jacked, temporary steel supports are first erected in the lower completed pipe jacking tunnel, and then temporary steel platform structures for the launching and receiving of the upper pipe jacking tunnel are constructed in the launching well and the receiving well, respectively.

[0092] (3) During the jacking of each section of the pipe jacking tunnel, grouting resistance reduction and attitude control measures are taken; the grouting hole is used to pressurize the resistance reduction mud outside the pipe section to reduce the jacking resistance. The pre-buried guide rail provides a guiding effect for the jacking construction and improves the control accuracy of the jacking construction axis.

[0093] (4) After each section of the pipe jacking tunnel is normally received, the pipe jacking machine is lifted out of the receiving well and transferred to the launching well for the construction of the next section of the pipe jacking tunnel; or the pipe jacking machine is transferred to the proposed pipe jacking tunnel portal in the receiving well and jacked in the direction of the launching well.

[0094] In step S2, after the tunnel pipe jacking construction is completed, according to the tunnel structure depth, tunnel use function, geological conditions, and existing structure crossing conditions, a prestressed structure can be constructed. Specifically, a prestressed hole 7 is reserved during the prefabrication of the rectangular pipe section. After each section of the pipe jacking tunnel is completed, a prestressed steel tendon is inserted into the rectangular pipe section using prestressed tensioning technology, and then the processes of tensioning, anchoring, grouting, and anchor sealing are performed. Finally, a lock beam 18 is constructed at both ends of the pipe jacking tunnel in the well to connect the pipe jacking tunnels into a whole stress structure, thereby improving the longitudinal stiffness of the tunnel. As shown in the embodiment. Figure 9 ​

[0095] The roof pipe tunnel in the middle of each layer is only penetrated by the prestressed steel beam at its roof and bottom, and the roof pipe tunnel at the outermost side is penetrated by the prestressed steel beam at the outermost side wall in addition to the roof and bottom.

[0096] In step S4,

[0097] (1) Before the side wall of the roof pipe tunnel is broken, a temporary steel support structure is first constructed inside the side wall;

[0098] (2) According to the engineering function, the side walls of the adjacent roof pipe tunnels are wholly or partially broken, and the longitudinal beam 8 and the column 9 are timely constructed to ensure the stability of the structure after the side wall of the current roof pipe tunnel is broken. After the adjacent roof pipe tunnel is broken to form a stable interconnection structure, the temporary steel support structure is removed, and the next adjacent roof pipe tunnel is broken until all or part of the side walls of the adjacent roof pipe tunnels are broken, and the temporary support is removed after the beam-column structure (i.e., the longitudinal beam and the column structure) is timely converted, and finally a stable interconnected underground space structure is formed;

[0099] (3) The side wall breaking and internal structure conversion construction of the roof pipe tunnels in different layers are constructed according to the principle of from top to bottom, and the same layer is constructed according to the principle of from left to right or from right to left horizontally and from the starting well to the receiving well vertically;

[0100] (4) The side wall breaking preferentially adopts the method of water drilling first and rope saw cutting second.

[0101] In step S5,

[0102] (1) After the internal conversion structure of the roof pipe tunnel in the same layer meets the design requirements, the temporary support is removed according to the principle of first supporting and then removing, and then supporting and then removing, from the starting well to the receiving well or in the opposite direction, to ensure the order of removal and the convenience of construction;

[0103] (2) The temporary steel support structure inside the upper tunnel is removed first, and then the starting temporary steel platform 15 and the receiving temporary steel platform 16 for the upper roof pipe tunnel construction in the working well are removed, and then the internal structure construction of the lower roof pipe tunnel is performed, and finally all the temporary structures in the lower roof pipe tunnel are removed to form a complete array of roof pipe tunnels, and then the interconnected underground space structure is formed by connecting with the existing or newly built underground structures at both ends.

[0104] According to the engineering characteristics and the construction period, when two roof pipe tunnels are selected for synchronous construction, the two tunnels for synchronous construction need to be spaced apart, and the erection and removal of the temporary steel structure need to be coordinated.

[0105] According to engineering characteristics and construction condition restrictions, when the ground cannot receive the well, the pipe jacking machine is jacked to the receiving end design position, the original shell is discarded in the pipe jacking tunnel, all components in the pipe jacking machine are removed and transported to the starting well, the steel structure shell of the pipe jacking machine is reserved in the tunnel as an initial support structure, the secondary lining and waterproof structure are constructed in the shell, and the structure is poured into a whole with the jacked pipe tunnel structure; the removed pipe jacking components are only required to be processed to restore the pipe jacking machine as a complete pipe jacking machine for subsequent pipe jacking tunnel construction.

[0106] According to engineering needs, the formed pipe jacking tunnel group can be connected with existing or newly-built underground structures in whole or in part to realize interconnection and intercommunication between two adjacent plots. Figure 13 、 14 as shown in the embodiments.

[0107] As shown in Figure 15 , according to engineering characteristics and construction condition restrictions, when the ground cannot construct the starting well and the receiving well, the cross passages (i.e., the starting end cross passage 19 and the receiving end cross passage 20) are constructed at the positions where the pipe jacking tunnel to be constructed is connected with the existing basement at both ends, and then the pipe jacking machine is started and received in the cross passages or the positions where the pipe jacking machine is started and received are connected with the existing basement.

[0108] The cross passage for starting and receiving needs to be connected with the open excavation shaft at one end to meet the hoisting and transportation of the pipe jacking equipment and construction.

[0109] The starting in the cross passage cannot be performed by using the rear structure, and the starting end is connected with the receiving end by using the top-pulling mode to provide the jacking force.

[0110] After the pipe jacking tunnel group is constructed, the cross passage is laterally broken to connect with the existing or newly-built underground structure to realize interconnection and intercommunication between two adjacent plots.

[0111] The advantages of the present application are as follows:

[0112] (1) The present application innovatively proposes an array type rectangular pipe jacking tunnel structure formed by jacking prefabricated reinforced concrete pipe segments and a construction method thereof, which can realize the construction of underground space and interconnection and intercommunication thereof under municipal roads or other important structures. The two ends of the formed array type pipe jacking tunnel are connected with the existing or newly-built underground structure, and finally the interconnection and intercommunication between two adjacent plots are realized, and the use function of the existing or newly-built underground space is greatly played or extended.

[0113] (2) The single large cross-section underground space can be divided into multiple large cross-section rectangular pipe jacking tunnels, which can effectively reduce the disturbance to the excavated stratum, make the ground surface settlement easier to control, and have better protection effect on the surrounding environment.

[0114] (3) The pipe curtain or pipe shed is used for supporting the pipe jacking tunnel, reduces the disturbance of the pipe jacking tunnel group construction to the upper soil and pipeline, and effectively controls the ground settlement.

[0115] (4) The prestress tension technology is used for improving the overall longitudinal stiffness and waterproof effect of the pipe jacking tunnel group in the soft stratum.

[0116] (5) The temporary steel support is erected, when the upper pipe jacking tunnel is jacked, the safety and stability of the internal structure of the lower pipe jacking tunnel can be ensured. When the side wall is broken, the temporary support can also effectively ensure the safety and stability of the internal structure conversion of the upper and lower pipe jacking tunnels, and achieves the purpose of transverse connection.

[0117] (6) When the receiving well construction is limited by the ground conditions and cannot be implemented, the shell receiving solution is proposed; when the starting well and the receiving well are both limited by the ground conditions and cannot be implemented, the starting and receiving solution in the horizontal channel is proposed.

[0118] (7) The method is suitable for the interconnection of underground space between two adjacent land plots, the method can effectively reduce the influence of construction on the city environment, life, traffic and the like, has high mechanization degree, small construction risk, avoids pipeline relocation, and has obvious social and environmental benefits, social benefits and economic benefits.

[0119] The present application is not limited to the above-mentioned embodiments, on the basis of the technical solutions disclosed in the present application, the skilled in the art can make some substitutions and deformations to some technical features without creative labor according to the disclosed technical content, and these substitutions and deformations are all within the protection scope of the present application.

Claims

1. A construction method for forming an array of rectangular tunnels for underground space interconnection and intercommunication, characterized in that, The arrayed rectangular tunnel comprises at least two tunnel groups, each tunnel group comprises at least two layers of tunnels, the upper layer of each tunnel group is a rectangular pipe section A, and the lower layer is a rectangular pipe section B, The top of the rectangular pipe section B is provided with a plurality of guide rails, the guide rails are connected with embedded parts in the rectangular pipe section B, and the guide rails are used for guiding during jacking of the rectangular pipe section A. Each tunnel comprises a plurality of rectangular pipe sections connected in sequence, the rectangular pipe sections are prefabricated reinforced concrete structures, A plurality of grouting holes are reserved on the rectangular pipe sections, and a resistance-reducing slurry or a solidified slurry is injected into the rectangular pipe sections through the grouting holes. The construction method comprises the following steps: S1, construction of a working well: A foundation pit is constructed at both ends of the arrayed tunnel by using the open excavation method as a starting well and a receiving well. After the foundation pit is excavated to the design elevation, a foundation pit bottom plate and an inner lining wall structure are constructed, the hole opening structure of each tunnel to be constructed is prepared, and the soil outside the hole opening is reinforced and treated; S2, construction of a rectangular tunnel: The mechanical method of rectangular pipe jacking is used for the construction of the arrayed tunnel. The same layer is jacked in sequence from the middle to the sides, or from left to right or from right to left. The different layers are jacked in sequence from bottom to top. After all the tunnels are jacked in sequence, the arrayed pipe jacking tunnel is formed; S3, reinforcement of the soil outside the tunnel: After the construction of each pipe jacking tunnel is completed, the solidified slurry is injected into the rectangular pipe sections through the grouting holes, so that the soil outside the pipe jacking tunnel and between the pipe jacking tunnels is solidified, and a waterproof layer outside the pipe jacking tunnel is formed; S4, construction of transverse connection inside the pipe jacking tunnel: After the construction of all the rectangular tunnels is completed and the grouting and reinforcement are completed, the side walls between the adjacent rectangular pipe sections are completely or partially removed according to the engineering function, and the longitudinal beam and column structures are constructed, so that the internal interconnected underground space structure is formed; S5, removal of temporary structures: It includes a steel support platform structure used for starting and receiving of the pipe jacking machine and a temporary steel support structure used for stress conversion when the side wall inside the pipe jacking tunnel is broken; S6, connection with existing or newly-built basement structure: After the temporary structure is removed, the existing or newly-built basement structure at the end of the working well is connected, and the interconnected underground space is formed.

2. The construction method of claim 1, wherein In step S2, a pipe shed or a pipe cover is constructed as an advanced support before the tunnel construction.

3. The construction method of claim 1, wherein the method further comprises: In step S2, it further comprises: (1) Before each pipe jacking tunnel is jacked, the structure conversion of the stress support in the working well is completed, the enclosure structure in the current pipe jacking tunnel hole opening range is removed, and the pipe jacking hole opening structure is prepared; (2) Before the upper pipe jacking tunnel is jacked, a temporary steel support is erected in the lower completed pipe jacking tunnel, and a temporary steel platform structure for starting and receiving construction of the upper pipe jacking tunnel is constructed in the starting well and the receiving well, respectively; (3) During the jacking process of each pipe jacking tunnel, grouting resistance reduction and posture control measures are taken, and a resistance-reducing slurry is injected into the pipe sections through the grouting holes. (4) After each segment of the pipe jacking tunnel is normally received, the pipe jacking machine is hoisted out of the receiving shaft and transferred to the starting shaft to perform the next segment of the pipe jacking tunnel construction; or the pipe jacking machine is transferred to the tunnel portal of the next segment in the receiving shaft and jacked to the starting shaft.

4. The construction method of claim 1, wherein, In step S2, prestressed ducts are reserved when the rectangular pipe sections are prefabricated, and after each segment of the pipe jacking tunnel is completed, prestressed steel bars are inserted into the rectangular pipe sections by using prestressed tensioning technology, and then tensioning, anchoring, grouting, and anchoring sealing are performed, and finally lock beams are constructed at both ends of the pipe jacking tunnel in the shaft to connect the pipe jacking tunnels into an integral force structure and improve the waterproof effect; Among them, the pipe jacking tunnel located in the middle of each layer only has prestressed steel bars inserted in the top plate and the bottom plate, and the pipe jacking tunnel located at the outermost side has prestressed steel bars inserted in the outermost side wall in addition to the top plate and the bottom plate.

5. The construction method of claim 1, wherein the method further comprises: In step S4, (1) Before the side wall of the pipe jacking tunnel is broken, a temporary steel support structure is first constructed inside it; (2) After the adjacent side pipe jacking tunnels are broken through to form a stable interconnection structure, the temporary steel support structure is removed, and the side wall of the next adjacent side pipe jacking tunnel is broken down for construction until all or part of the side walls of the adjacent side pipe jacking tunnels are broken down, and the temporary support is removed in time after the beam-column structure is converted, and finally a stable interconnected underground space structure is formed; (3) The side wall breaking and internal structure conversion construction of different layers of pipe jacking tunnels are carried out according to the principle of from top to bottom, and the same layer of pipe jacking tunnels are carried out according to the principle of from left to right or from right to left horizontally and from the starting shaft to the receiving shaft vertically; (4) The side wall breaking adopts the method of water drilling first and then rope saw cutting.

6. The construction method of claim 1, wherein, In step S5, (1) After the internal conversion structure of the same layer of pipe jacking tunnels meets the design requirements, the temporary support is removed according to the principle of first supporting and then removing, from the starting shaft to the receiving shaft or in the opposite direction; (2) The temporary steel support structure inside the upper tunnel is removed first, and then the temporary steel platform in the working shaft for the starting and receiving construction of the upper pipe jacking tunnel is removed, and then the internal structure construction of the lower pipe jacking tunnel is carried out, and finally all temporary structures in the lower pipe jacking tunnel are removed to form a complete array of pipe jacking tunnels, and then the interconnected underground space structure is formed by connecting with the existing or newly built underground structures at both ends.

7. The construction method of claim 1, wherein, According to the engineering characteristics and the construction period requirements, when two pipe jacking tunnels are selected for synchronous construction, the two tunnels need to be spaced apart, and the erection and removal of the temporary steel structure need to be coordinated.

8. The construction method of claim 1, wherein, According to engineering characteristics and construction condition restrictions, when the ground cannot receive the well, the pipe jacking machine is jacked to the receiving end design position, the shell is discarded in situ in the pipe jacking tunnel, all components in the pipe jacking machine are removed and transported to the launching well, and then hoisted out; the steel structure shell of the pipe jacking machine is reserved in the tunnel as an initial support structure, the second lining and waterproof structure are constructed in the shell, and the shell is integrally cast with the jacked pipe tunnel structure; According to engineering needs, the pipe jacking tunnel group can be connected with existing or newly-built underground structures in whole or in part to realize interconnection and intercommunication between two adjacent plots.

9. The construction method of claim 1, wherein, According to engineering characteristics and construction condition restrictions, when the ground cannot receive the well, the pipe jacking machine is jacked to the receiving end design position, the shell is discarded in situ in the pipe jacking tunnel, all components in the pipe jacking machine are removed and transported to the launching well, and then hoisted out; the steel structure shell of the pipe jacking machine is reserved in the tunnel as an initial support structure, the second lining and waterproof structure are constructed in the shell, and the shell is integrally cast with the jacked pipe tunnel structure; The horizontal passage needs to be connected with an open-cut working well at one end to meet the lifting and transportation of pipe jacking equipment and construction; The horizontal passage is launched, and the launching end is connected with the receiving end by using a top-pulling mode to provide jacking force; After the pipe jacking tunnel group construction is completed, the horizontal passage is laterally broken to connect with existing or newly-built underground structures to realize interconnection and intercommunication between two adjacent plots.

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