Large-section earth pressure balancing rectangular jacking pipe joint of motor vehicle tunnel and method for constructing large-section earth pressure balancing rectangular jacking pipe

Abstract

The invention discloses a large-section earth pressure balancing rectangular jacking pipe joint of a motor vehicle tunnel. The large-section earth pressure balancing rectangular jacking pipe joint is characterized in that a jacking direction of a jacking pipe is defined as a forward direction, grouting holes which radially penetrate through a pipe wall are peripherally arranged in the middle of the outer wall surface of the jacking pipe joint at intervals, lifting holes are arranged in middles of four surfaces of the jacking pipe joint, and radial thixotropic mud grouting holes which penetrate through the pipe wall are peripherally arranged in the front of the outer wall surface of the jacking pipe joint at intervals; and the top of the jacking pipe joint is arched, and four corners of the section of the pipe joint are of arc chamfer structures. The invention further discloses a method for constructing the jacking pipe joint. The large-section earth pressure balancing rectangular jacking pipe joint and the method have the advantages that a earth pressure balancing pipe jacking process can be applied to the field of motor vehicle tunnels, the long-term technical difficult problem that the earth pressure balancing pipe jacking process cannot be applied to constructing the motor vehicle tunnels is solved, the stability requirement that the pipe joint is prevented from being staggered under the condition of long-term unbalanced dynamic loads of motor vehicles on the tunnel is met assuredly, a permanent waterproofing function is realized, and the cost for later-stage operation and maintenance is greatly lowered.

Description

technical field [0001] The invention relates to the field of underground engineering construction, in particular to a rectangular tunnel earth pressure balance pipe jacking joint and a construction method, which can be applied to the earth pressure balance pipe jacking construction of tunnel engineering that passes through other structures such as municipal roads, railways or rivers. Background technique [0002] The latest progress in research on earth pressure balance rectangular pipe jacking at home and abroad lies in the implementation of municipal crossing passages and pedestrian passages in underground commercial streets. At present, the cross-section of the existing earth pressure balance rectangular pipe jacking is a small rectangle, which has the following defects: 1. The top of the existing earth pressure balance rectangular pipe jacking is set on a plane, and the four corners are right-angled corners, and the bearing The ability is small. 2. Along the constructio...

AI Technical Summary

Problems solved by technology

At present, the cross-section of the existing earth pressure balance rectangular pipe jacking is a small rectangle, which has the following defects: 1. The top of the existing earth pressure balance rectangular pipe jacking is set on a plane, and the four corners are right-angled corners, and the bearing small ability

2. Along the construction direction, metal parts such as socket steel rings in the waterproof structure of the front and rear pipe jacking joints are easily damaged due to corrosion after many years of use, so that the waterproof structure of the front and rear pipe jacking joints cannot be used as a permanent waterproof structure. After long-term use (20-30 years), the tunnel constructed by using the existing earth pressure balance rectangular pipe jacking is prone to water leakage at the pipe joints, which affects the normal use of the tunnel and increases the later operation and maintenance costs.

Of course, since earth pressure balance rectangular jacking pipes have only been widely used in recent years, the phenomenon of water leakage has not yet appeared on a large scale

3. The mechanical structure of the existing earth pressure balance rectangular pipe jacking determines its small cross-section. According to the relevant specifications (urban road engineering design code CJJ37-2012) and the requirements of the local planning departments for the width and height limit of tunnel motor vehicle lanes, both Some rectangular pipe jacking section dimensions are also difficult to meet the requirements

4. Because the joints of the existing rectangular pipe jacking joints are all flexible socket joints, when different joints are subjected to large vertical or lateral loads, dislocation of the joints is easy to occur, causing the joints to fail in waterproofing and even lose their use functions

5. The existing earth pressure balance rectangular jacking pipes are used in municipal crossing passages and underground commercial street pedestrian passages. This type of tunnel has short length, no motor vehicles passing through, and thus no unbalanced dynamic load.

If the existing large-section motor vehicle tunnel earth pressure balance rectangular pipe jacking joints are subjected to unbalanced dynamic loads for a long time, the pipe jacking joints are prone to misalignment during long-term use

[0003] In short, compared with underground pedestrian passages, motor vehicle tunnels have the characteristics of larger cross-section, larger soil covering and vertical load, and longer tunnels. The current earth pressure balance rectangular pipe jacking capacity is small, which cannot solve the problem of water leakage after long-term use. problem, and it cannot ensure that there will be no misalignment between the pipe jacking joints after long-term use, and it cannot be used in motor vehicle tunnels.

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