CN-116607961-B - Expressway tunnel extension structure and construction method

CN116607961BCN 116607961 BCN116607961 BCN 116607961BCN-116607961-B

Abstract

The invention relates to the field of tunnel construction, in particular to an expressway tunnel extension structure and a construction method, wherein the expressway tunnel extension structure comprises a tunnel lining on an old expressway tunnel, and further comprises an upper layer traffic lane plate horizontally and fixedly arranged on the lower side of the edge of the tunnel lining, a plurality of piles supported on the lower side of the edge of the tunnel lining, a tunnel circumference structure is poured between two adjacent piles, a lower layer traffic lane plate is horizontally arranged on the tunnel circumference structure, the lower layer traffic lane plate is positioned among the piles, and an extension traffic space is formed among the piles, the upper layer traffic lane plate, the lower layer traffic lane plate and the tunnel circumference structure. According to the scheme, the tunnel lining on the original old expressway tunnel does not need to be reconstructed, compared with a newly-built tunnel, the method can effectively save the operation steps such as the tunnel lining, the excavation and the like in the new tunnel construction, the construction cost and the use of raw materials, and can quickly finish reconstruction and reduce the reconstruction cost.

Inventors

JING SHIHONG
LI LIZHONG

Assignees

重庆高速公路集团有限公司

Dates

Publication Date: 20260508
Application Date: 20230531

Claims (8)

1. Expressway tunnel extension structure, including the tunnel lining on the old expressway tunnel, its characterized in that still includes: The upper layer traffic lane plate is horizontally and fixedly arranged at the lower side of the tunnel lining edge; the tunnel lining structure comprises a plurality of piles supported on the lower side of the edge of the tunnel lining, a tunnel circumference structure is poured between two adjacent piles, a lower layer traffic lane plate is horizontally arranged on the tunnel circumference structure, and the lower layer traffic lane plate is positioned among the piles; the piles are uniformly arranged along the axis of the tunnel lining, the piles on two sides of the tunnel lining are in one-to-one correspondence, a cross beam is horizontally welded between the upper ends of the piles, the upper side of the cross beam is propped against the lower surface of the upper layer traffic lane plate, and the axis of the cross beam is vertical to the traffic direction; The upper layer traffic lane board comprises a precast concrete board and a pouring treatment layer, wherein the pouring treatment layer is positioned on the precast concrete board, and the precast concrete board is fixedly connected with the beam or the tunnel lining.
2. The expressway tunnel extension structure according to claim 1, wherein the upper side of the cross member abuts against the lower surface of the upper layer traffic lane plate, and the axis of the cross member intersects with the direction of traffic.
3. The expressway tunnel extension structure according to claim 2, wherein said upper layer traffic lane plate is a cast-in-place reinforced concrete layer.
4. A highway tunnel extension structure according to claim 3, wherein the piles are reinforced concrete columns.
5. The expressway tunnel extension structure according to claim 4, wherein said upper layer traffic lane plate is a passenger car traffic lane plate and said lower layer traffic lane plate is a commercial car traffic lane plate.
6. A construction method of an expressway tunnel extension structure according to claim 5, further comprising the steps of: preparing a mounting column, beam steel bars, concrete, steel bars and a tunnel circumference structure pouring template; Digging Rong Zhuqiang for accommodating piles at the lower side of the edge of the tunnel lining, digging column accommodating cavities at intervals along the running direction, installing installation columns in the column accommodating cavities after the column accommodating cavities reach the designed height, welding beam reinforcing steel bars on the top ends of the installation columns, pouring concrete into the column accommodating cavities and the beam reinforcing steel bars, forming reinforced concrete columns after the installation columns and the concrete are solidified, and forming cross beams after the beam reinforcing steel bars and the concrete are solidified; binding reinforcing steel bars on the mountain rock strata between the reinforced concrete columns, installing a tunnel perimeter structure pouring template at the reinforcing steel bars, pouring concrete between the mountain rock strata and the tunnel perimeter structure pouring template, and forming the tunnel perimeter structure after the concrete is solidified; The upper layer traffic lane plate is paved and constructed on the cross beam and is attached to the lower side of the edge of the tunnel lining, the lower layer traffic lane plate is horizontally paved and constructed between the tunnel circumference structures, and the side edge of the lower layer traffic lane plate is attached to the lower end of the reinforced concrete column.
7. The construction method of the expressway tunnel extension structure according to claim 6, wherein when the upper layer traffic lane plate is a precast concrete plate and a pouring treatment layer, the precast concrete plate is transported into the tunnel, the precast concrete plate is supposed to be paved on a beam, gaps among the precast concrete plates are filled with concrete to form the pouring treatment layer, or when the upper layer traffic lane plate is a cast-in-situ reinforced concrete layer, the upper layer traffic lane plate is constructed in sections, a cast-in-situ reinforced concrete layer construction template is prepared, a cast-in-situ reinforced concrete layer structure is formed by binding reinforcing steel bars, the cast-in-situ reinforced concrete layer construction template is wrapped outside the reinforcing steel bars, the concrete is poured into the cast-in-situ reinforced concrete layer construction template, the segmented upper layer traffic lane plate is formed after the concrete is solidified, and the segmented upper layer traffic lanes are formed after the segmented upper layer traffic lanes are solidified.
8. The construction method of the expressway tunnel extension structure according to claim 7, wherein several of the reinforced concrete columns can be constructed simultaneously or in batches at intervals.

Description

Expressway tunnel extension structure and construction method Technical Field The invention relates to the technical field of tunnel structure design and construction, in particular to an expressway tunnel extension structure and a construction method. Background With the rapid development of highway traffic industry in China, the design and construction of early highway tunnels can not meet the requirements of rapid development of traffic, and the problems are frequent. The most important problem is that when the old tunnel expressway is originally designed, the expressway in the original tunnel is mostly provided with two-way single lanes, the number of lanes is small, the vehicle throughput of the original design of the lanes is obviously smaller than the actual demand of the current vehicle throughput, so that the situation that congestion occurs at the tunnel of the expressway often occurs, and when the expressway uses the peak period section, the situation of traffic congestion is easy to occur, and accidents are also easy to occur. The old expressway tunnel needs to be reformed by adopting three schemes, namely (1) a single-hole bidirectional two-lane tunnel is reformed into a double-hole unidirectional two-lane tunnel, which is the simplest form of tunnel reconstruction and expansion operation, and a new tunnel is directly repaired at the left side or the right side of the original tunnel by a certain distance; (2) The reconstruction mode is complex, the existing tunnel needs to be expanded and dug, and the expansion and dug mode generally comprises three modes, namely, the left side of the ① original tunnel is mostly expanded and dug (for a single hole), the right side of the ② original tunnel is mostly expanded and dug, and the ③ original tunnel is positioned in the middle of an expansion and dug section; (3) The two-hole one-way two-lane tunnel is reconstructed into an 8-lane tunnel, and two types of reconstruction are adopted in the reconstruction form of ① to be reconstructed into a two-hole one-way four-lane tunnel and ② to be reconstructed into a four-hole one-way two-lane tunnel. The three schemes all relate to newly arranging a tunnel beside an old expressway tunnel or expanding the left side and the right side of the original tunnel, and all relate to the reconstruction of structures such as a tunnel lining structure and the like, the expansion of the highway in the tunnel can cause the vertical pressure of mountain rock stratum born by the tunnel structure to be greatly increased, so that the structural design is complex and the stress is huge, the cost of manpower and material resources spent on the reconstruction of the expressway tunnel is greatly increased, meanwhile, when the expressway tunnel is horizontally expanded or newly built, the expressway tunnel is often influenced by the small surrounding empty geological environment, the horizontal expansion is difficult, when corresponding space and topography are expanded, residents and residents around the old expressway tunnel are easily encountered, residence and fields are fixed for a long time, the difficult problem of difficult disassembly compensation exists, the expressway tunnel is slowly improved, and the concrete implementation of projects is also influenced. Disclosure of Invention Aiming at the defects existing in the prior art, the invention provides an expressway tunnel extension structure and a construction method, so as to solve the problem that the cost of manpower and material resources is high when an old expressway tunnel is reformed by a new tunnel. In order to achieve the aim, the invention adopts the basic scheme that the expressway tunnel extension structure comprises a tunnel lining on an old expressway tunnel and further comprises: the expansion and widening of the highway tunnel in the horizontal direction is changed into the diversion of the upper and lower layer traffic lanes, so that the aim of highway expansion is fulfilled; digging a driving channel downwards under the old tunnel structure; The bridge pier body bent cap horizontally arranged can be used for resisting the horizontal lateral pressure of the tunnel; The tunnel lining structure comprises a plurality of piles supported on the lower side of the tunnel lining edge, a tunnel circumference structure is poured between two adjacent piles, a lower layer traffic lane plate is horizontally arranged on the tunnel circumference structure, the lower layer traffic lane plate is positioned among the piles, and an expanded traffic space is formed among the piles, the upper layer traffic lane plate, the lower layer traffic lane plate and the tunnel circumference structure. The pile column and the tunnel circumference structure are stably supported at the expansion driving space, and as the pile column is stable at the lower side of the lining edge of the old tunnel, the expansion driving space is positioned at the lower side of the driving space of the old e