A construction system and method for a pipe gallery with integrally prefabricated pipe sections and inner partitions

Abstract

A construction system and method for a pipe gallery with integrally prefabricated pipe sections and inner baffles, the pipe gallery comprises integrally prefabricated pipe sections and inner baffles; grouting holes are arranged on the side walls of the pipe sections; the construction system comprises an excavation system, a friction-reducing grouting pipe system and a jacking system; the excavation system comprises a spiral excavator, a support pump and a pump pipe; the support pump is connected to the spiral excavator; one end of the pump pipe is connected to the support pump, and the other end of the pump pipe extends into a slag pool; a high-pressure water injection ring is arranged between the pump pipe and the support pump; the friction-reducing grouting pipe system comprises a grouting pipe and a grouting valve; the grouting valve is arranged correspondingly to the grouting hole; the grouting valve comprises a horizontal pipe section and a longitudinal pipe section; the port of the longitudinal pipe section is connected to the grouting hole; the number of grouting pipes is two less than the number of grouting valves, and they are correspondingly connected between adjacent grouting valves; one end port of the two grouting valves at the bottom is reserved as a slurry injection port; and a pre-buried steel pipe is arranged on the inner baffle. The invention solves the technical problems that the integrity of the pipe section and the inner baffle is poor in the traditional jacking pipe gallery construction, and it is difficult to assemble on site or cast-in-place.

Description

Technical Field

[0001] The invention belongs to the technical field of urban underground comprehensive pipe gallery engineering, and particularly relates to a construction system and a construction method of a pipe gallery in which pipe sections and inner partitions are integrally prefabricated. Background Art

[0002] Underground utility tunnels are important infrastructure and lifelines to ensure the operation of cities. In recent years, my country has been vigorously promoting the construction of urban utility tunnels. During the construction of utility tunnels, important obstacles such as highways, railways, municipal roads and rivers are often encountered. Traditional construction methods have a great impact on these obstacles and can no longer meet the construction requirements of such utility tunnels. The rectangular jacking method for utility tunnel construction is widely used because it does not damage the pavement structure, the ground settlement is controllable, the jacking speed is fast and the construction period is short. The rectangular jacking method usually adopts an underground mechanical closed system for construction. This system has the advantages of high construction safety, no dust, low noise, and "green, environmental protection, and safety".

[0003] Because the tunnel has the requirement of compartment division, internal partitions are installed in the tunnel. At present, there are two methods in the construction of multi-compartment tunnels: prefabricated internal partitions and then assembled, and cast-in-place internal partitions after jacking construction. The method of prefabricated internal partitions and then assembled requires large-scale machinery and equipment to be assembled on site, which brings problems such as inconvenience of on-site construction and positioning errors. In addition, when processing nodes, screws are generally used to connect the prefabricated partition wall and the pipe joint. The durability of the screws is very poor and cannot guarantee a service life of 100 years. In addition, the integrity of the tunnel pipe joint and the internal partition is also poor. The method of prefabricated internal partitions and then cast-in-place construction, because the height of the internal partition is usually 5m-9m, the formwork support investment in cast-in-place construction is large, the installation is difficult, the cost is high, the construction is inconvenient, and the construction period is long; and the density of the concrete on the top of the internal partition cannot be guaranteed, which affects the integrity of the structure and poses quality risks. Summary of the invention

[0004] The purpose of the present invention is to provide a construction system and method for a pipe gallery with integrally prefabricated pipe segments and inner partitions, so as to solve the technical problems of poor integrity of pipe segments and inner partitions in traditional pipe-jacking pipe gallery construction and difficulty in on-site assembly or cast-in-place construction.

[0005] To achieve the above purpose, the present invention adopts the following technical solution.

[0006] A construction system for a pipe gallery with pipe sections and inner baffles prefabricated as a whole, the pipe gallery includes pipe sections and inner baffles, and the pipe sections and inner baffles are prefabricated as a whole; grouting holes are arranged on the side walls of the pipe sections at intervals along the annular direction; the construction system includes an excavation system, a friction-reducing grouting pipe system and a jacking system; the excavation system includes a spiral excavator, a support pump and a pump pipe; the spiral excavator is arranged in a tunnel to output the slag cut in front of the pipe gallery; the support pump is connected to the discharge port of the spiral excavator; one end of the pump pipe is connected to the support pump, and the other end of the pump pipe passes through the pipe gallery and extends into a slag pool arranged at the top of a working shaft in; a high-pressure water injection ring is arranged between the pump pipe and the support pump; the high-pressure water injection ring is used for injecting high-pressure water into the pump pipe; the friction-reducing grouting pipe system comprises a grouting pipe and a grouting valve; there is a group of grouting valves, which are arranged corresponding to the grouting holes; the grouting valves are all T-shaped, comprising a transverse pipe section and a longitudinal pipe section; the longitudinal pipe section port of the grouting valve is connected to the grouting hole; the number of the grouting pipes is two less than the number of the grouting valves, and they are correspondingly connected between the transverse pipe sections of adjacent grouting valves; the ports at one end of the two grouting valves at the bottom are reserved as slurry injection ports; a pre-buried steel pipe is arranged on the inner partition at the position corresponding to the grouting pipe passing through.

[0007] Preferably, the cross-section of the pipe segment is rectangular, and there is at least one inner partition plate, which is arranged inside the pipe segment and divides the pipe segment into at least two chambers.

[0008] Preferably, the spacing between adjacent grouting holes is 1m~3m.

[0009] Preferably, one end of the high-pressure water injection ring is threadedly connected to the pump pipe, and the other end of the high-pressure water injection ring is threadedly connected to the support pump.

[0010] Preferably, a group of jacks are provided on both sides of the pipe gallery; the jacks are horizontally pressed between the end of the vertical plate of the pipe section and the side wall of the working pit.

[0011] A construction method for a construction system of a pipe gallery in which pipe sections and inner partitions are integrally prefabricated comprises the following steps.

[0012] Step 1: Make the pipe gallery: prefabricate the inner partitions and pipe sections as a whole in the prefabrication yard, and embed steel pipes in the inner partitions.

[0013] Step 2: Complete the installation of the pipe jacking machine and the installation of supporting equipment in the working pit.

[0014] Step three, arrange the friction-reducing grouting pipe system in the pipe gallery: connect the grouting valves to the grouting holes accordingly, and connect the grouting pipes between adjacent grouting valves; wherein, no grouting pipe is arranged between the two grouting valves at the bottom, and the ports at one end of the two grouting valves are reserved as slurry injection ports.

[0015] Step 4: Install the excavation system.

[0016] Step five: hoist the pipe gallery section by section into the working well, use the jack to provide jacking force to the pipe gallery, use the pipe jacking machine to dig, and use the spiral excavator to excavate. At the same time, use the friction-reducing grouting pipe system to inject grout around the pipe gallery to be jacked, and carry out the jacking of the pipe gallery.

[0017] Step six, use a support pump and pump pipe to transport soil out of the working well, and at the same time use a high-pressure water injection ring to inject high-pressure water into the pump pipe to reduce the frictional resistance between the slag and the pump pipe wall.

[0018] Step seven, during the jacking process, the gap between the inner partition of the jacking corridor and the inner partition of the corridor in front of it is sealed by caulking.

[0019] Step 8: Repeat the process from step 5 to step 7 until all the pipe galleries are pushed into place, and the construction is completed.

[0020] Preferably, when the pipe gallery is twisted during the jacking process, step a is further included between step five and step six: correcting the deviation of the pipe gallery by using a jack.

[0021] Preferably, the sealing of the gap in step six is ​​specifically as follows: firstly, a sealing plate is placed in the gap of the inner partition plate, and then the gap is sealed with a sealing paste.

[0022] Compared with the prior art, the present invention has the following characteristics and beneficial effects.

[0023] 1. The invention provides a method for constructing a multi-compartment rectangular pipe jacking gallery in which pipe segments and inner partitions are integrally prefabricated, which solves the problems of slag discharge, grouting and other key links in the prefabrication process and jacking process of the pipe segments of the gallery with central partition walls, as well as the treatment of the joints of the central partition walls of the pipe segments in the later stage. The method has high excavation efficiency, fast construction speed and good integrity of the pipe gallery.

[0024] 2. Since the pipe gallery with integrally cast inner partitions and pipe sections cannot be transported by common rail slag trucks during jacking construction, the present invention adopts trackless transportation, i.e., pumping, to pump the soil in one direction. The slag pumping system is simple, including a support pump arranged at the discharge port of the jacking spiral excavator and a pump pipe connected from the support pump and extending to the ground slag pool. At the same time, a high-pressure water injection ring is used to reduce the resistance between the slag and the pipe wall, thereby increasing the pumping distance, reducing the probability of slag blocking the pipe, and improving the excavation efficiency.

[0025] 3. In the construction method of the present invention, the inner partition wall and the pipe segment are integrally prefabricated in the prefabrication yard, and the inner partition wall is reserved with a steel pipe grouting pipeline hole, which is convenient for the arrangement of the friction-reducing grouting pipe system inside the pipe segment. After the jacking construction is completed, the hole is filled with expansive cement mortar; during the normal jacking process, the slag is pumped out by trackless transportation, i.e., pumping, and a high-pressure water injection ring is used to reduce the resistance between the slag and the pipe wall, thereby improving the excavation efficiency; at the same time, the jacking force of the left and right sides of the jack is adjusted, and the cutter disc is reversed in time to correct the torsion of the pipe segment, thereby ensuring the accuracy of the jacking position of the pipe gallery; during the jacking process, the gaps between the inner partition walls are first filled with a caulking plate, and then filled with a sealing paste after the jacking is completed, thereby ensuring the airtightness of each compartment of the pipe gallery. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0027] Figure 1 It is a schematic diagram of the construction system of the present invention.

[0028] Figure 2 It is a front structural schematic diagram of the pipe gallery in the present invention.

[0029] Figure 3 It is a schematic diagram of the longitudinal cross-sectional structure of the pipe gallery in the present invention.

[0030] Figure 4 It is a structural schematic diagram of the grouting valve in the present invention.

[0031] Figure 5 It is a schematic diagram of the connection structure of adjacent pipe galleries in the present invention.

[0032] Figure numerals: 1-pipe gallery, 1.1-pipe section, 1.2-inner partition, 2-grouting hole, 3-screw excavator, 4-tunnel, 5-support pump, 6-pump pipe, 7-working well, 8-slag pool, 9-high-pressure water injection ring, 10-grouting pipe, 11-grouting valve, 11.1-horizontal pipe section, 11.2-longitudinal pipe section, 12-slurry injection port, 13-buried steel pipe, 14-jack, 15-caulking plate, 16-sealing paste. DETAILED DESCRIPTION

[0033] like Figure 1-5As shown, the construction system of the pipe gallery in which the pipe segments and the inner baffles are prefabricated as a whole, the pipe gallery 1 includes a pipe segment 1.1 and an inner baffle 1.2, and the pipe segment 1.1 and the inner baffle 1.2 are prefabricated as a whole; grouting holes 2 are arranged on the side wall of the pipe segment 1.1 along the circumferential interval; the construction system includes an excavation system, a friction-reducing grouting pipe system and a jacking system; the excavation system includes a spiral excavator 3, a support pump 5 and a pump pipe 6; the spiral excavator 3 is arranged in a tunnel 4 to output the slag cut in front of the pipe gallery 1; the support pump 5 is connected to the discharge port of the spiral excavator 3; one end of the pump pipe 6 is connected to the support pump 5, and the other end of the pump pipe 6 passes through the pipe gallery 1 and extends into a slag pool 8 arranged at the top of the working shaft 7; A high-pressure water injection ring 9 is arranged between the pumps 5; the high-pressure water injection ring 9 is used to inject high-pressure water into the pump pipe 6; the friction-reducing grouting pipe system includes a grouting pipe 10 and a grouting valve 11; the grouting valve 11 has a group and is arranged corresponding to the grouting hole 2; the grouting valves 11 are all T-shaped, including a horizontal pipe section 11.1 and a longitudinal pipe section 11.2; the port of the longitudinal pipe section 11.2 of the grouting valve 11 is connected to the grouting hole 2; the number of the grouting pipes 10 is two less than the number of the grouting valves 11, and they are correspondingly connected between the horizontal pipe sections 11.1 of adjacent grouting valves 11; the ports at one end of the two grouting valves 11 at the bottom are reserved as slurry injection ports 12; a pre-buried steel pipe 13 is provided on the inner partition 1.2 at the position corresponding to the grouting pipe 10 passing through.

[0034] In this embodiment, the cross section of the pipe section 1.1 is rectangular, and there is at least one inner partition plate 1.2, which is arranged inside the pipe section 1.1 and divides the pipe section 1.1 into at least two chambers.

[0035] In this embodiment, the spacing between adjacent grouting holes 2 is related to the size of the pipe segment 1.1, and is generally 1m to 3m.

[0036] In this embodiment, one end of the high-pressure water injection ring 9 is threadedly connected to the pump pipe 6 , and the other end of the high-pressure water injection ring 9 is threadedly connected to the support pump 5 .

[0037] In this embodiment, a group of jacks 14 are respectively provided on both sides of the pipe gallery 1; the jacks 14 are horizontally pressed between the end of the vertical plate of the pipe section 1.1 and the side wall of the working shaft 7.

[0038] In this embodiment, the spiral excavator 3 is on the pipe jacking machine and is used to output the cut soil.

[0039] In this embodiment, a pad is provided between the jack 14 and the side wall of the working well 7 .

[0040] The construction method of this construction system is as follows: the inner partition 1.2 and the pipe segment 1.1 are integrally prefabricated in the prefabrication yard; a grouting pipe hole is reserved in the inner partition 1.2; a pre-buried steel pipe 13 is arranged in the grouting pipe hole to facilitate the arrangement of the friction-reducing grouting pipe system inside the pipe segment 1.1; during the normal jacking process, the slag is pumped and discharged by trackless transportation, i.e., pumping, and a high-pressure water injection ring 9 is used to inject water to reduce the resistance between the slag and the pipe wall; the gaps between adjacent middle partition walls are filled with a caulking plate 15 during the jacking process, and then the seams are caulked with a sealing paste 16; during jacking, if the pipe gallery 1 is twisted, the jacking force of the jacks 14 on the left and right sides and the cutter head are reversed in time to correct the twisting of the pipe gallery 1; after the jacking construction is completed, the friction-reducing grouting pipe system is removed, and the holes are filled with expansive cement mortar; the construction process includes the following steps.

[0041] Step 1, manufacturing the pipe gallery 1: integrally prefabricate the inner partition 1.2 and the pipe section 1.1 in the prefabrication yard, and the inner partition 1.2 is pre-buried with the embedded steel pipe 13.

[0042] Step 2: Complete the installation of the pipe jacking machine and the installation of the supporting equipment in the working well 7.

[0043] Step three, arrange the friction-reducing grouting pipe system in the pipe gallery 1: connect the grouting valves 11 to the grouting holes 2 accordingly, and connect the grouting pipes 10 between adjacent grouting valves 11; wherein, no grouting pipe 10 is arranged between the two grouting valves 11 at the bottom, and the ports at one end of the two grouting valves 11 are reserved as slurry injection ports 12.

[0044] Step 4: Install the excavation system.

[0045] Step five, the pipe gallery 1 is hoisted into the working well 7 section by section, the jack 14 provides jacking force to the pipe gallery 1, the pipe jacking machine excavates, the spiral excavator 3 excavates, and at the same time, a friction-reducing grouting pipe system is used to inject grout around the pipe gallery 1 to be jacked, so as to jack the pipe gallery 1.

[0046] Step six, use the support pump 5 and the pump pipe 6 to transport soil out of the working well 7, and use the high-pressure water injection ring 9 to inject high-pressure water into the pump pipe to reduce the friction resistance between the slag and the wall of the pump pipe 6.

[0047] Step seven, during the jacking process, the gap between the inner partition plate 1.2 of the jacking corridor 1 and the inner partition plate 1.2 of the corridor 1 in front of it is sealed by caulking.

[0048] Step 8, repeat the process from step 5 to step 7 until all the pipe galleries 1 are pushed into place, and the construction is completed.

[0049] In this embodiment, when the pipe gallery 1 is twisted during the jacking process, step a is further included between step five and step six: using a jack 14 to correct the deviation of the pipe gallery 1 .

[0050] In this embodiment, during the jacking construction, there are certain gaps between the pipe sections 1.1 and between the inner partitions 1.2. Due to the airtightness requirements of each compartment in the pipe gallery 1, it is necessary to perform caulking and sealing construction of the gaps. During the jacking process, a caulking plate 15 is first placed in the gap of the inner partition 1.2, and after the jacking construction is completed, a polysulfide sealing paste is used to caulk the gaps. The caulking and sealing of the gaps in step six are specifically as follows: first, a caulking plate 15 is placed in the gap of the inner partition 1.2, and then the sealing paste 16 is used to caulk the gaps.

[0051] In this embodiment, the caulking plate 15 is made of polyethylene foam plastic; the sealing paste 16 is made of polysulfide sealing paste; before caulking, the impurities and oil stains in the gap must be cleaned up to make it flat, clean and dry; the sealing paste 16 is first scraped on both sides of the gap, and the sealing paste 16 is scraped into the gap to the required height for the second time; the sealing paste 16 is required to be pressed and scraped flat to prevent bubbles from being introduced to affect the strength and water tightness. The surface drying time of the sealing paste 16 is 24 hours, and it will reach 80% strength after 7 days. Before the sealing paste 16 is fully cured, it must be protected to prevent rainwater from intruding.

[0052] Of course, in other embodiments, the joints between the pipe galleries 1 can also be directly filled with mortar.

[0053] In this embodiment, when the inner baffle 1.2 and the pipe segment 1.1 are prefabricated as a whole, a pre-buried steel pipe 13 is arranged on the inner baffle 1.2, which is used to pass through the jacking process to form an internal friction-reducing grouting pipe system of a complete mud sleeve, so as to facilitate the arrangement of the grouting pipe system. The number of the pre-buried steel pipes 13 is determined according to the arrangement of the friction-reducing grouting pipe system at the position of the inner baffle 1.2, usually 1 to 2. The size of the pre-buried steel pipe 13 is adjusted according to the size of the on-site grouting pipe 10. The position of the pre-buried steel pipe 13 is close to the inner wall of the pipe segment 1.1 and is in the same vertical section as the slurry injection port 12. Its specific position should be able to ensure that the grouting pipe 10 is not damaged, and the thixotropic mud used for the friction-reducing grouting pipe system can smoothly pass through the grouting pipe 10 to ensure smooth jacking construction. Finally, the pre-buried steel pipe 13 is filled with expansive cement mortar.

[0054] In this embodiment, due to the space requirements of the size of each compartment in the pipe gallery 1, the inner partition 1.2 is often not in the middle position of the pipe segment 1.1, which causes the weight imbalance on the left and right sides of the pipe segment 1.1, resulting in the pipe gallery 1 being easily twisted during the jacking process. It is necessary to take corresponding anti-twisting measures for the pipe segment 1.1, and take measures such as adjusting the jacking force of the jacks 14 on the left and right sides and reversing the cutter head in time to correct the twisting.

Claims

1. A construction method for a construction system of a pipe gallery in which pipe segments and inner baffles are integrally prefabricated, the pipe gallery (1) comprising pipe segments (1.1) and inner baffles (1.2), and the pipe segments (1.1) and the inner baffles (1.2) are integrally prefabricated; characterized in that: The inner partition (1.2) is not located in the middle of the pipe section (1.1); grouting holes (2) are arranged on the side wall of the pipe section (1.1) at intervals in the annular direction; the construction system comprises an excavation system, a friction-reducing grouting pipe system and a jacking system; the excavation system comprises a spiral excavator (3), a support pump (5) and a pump pipe (6); the spiral excavator (3) is arranged in the tunnel (4) to output the slag cut in front of the pipe gallery (1); the support pump (5) is connected to the discharge port of the spiral excavator (3); one end of the pump pipe (6) is connected to the support pump (5), and the other end of the pump pipe (6) passes through the pipe gallery (1) and extends into a slag pool (8) arranged at the top of the working shaft (7); a high-pressure water injection ring (9) is arranged between the pump pipe (6) and the support pump (5); the high-pressure water injection ring (9) 9) for injecting high-pressure water into the pump pipe (6); the friction-reducing grouting pipe system comprises a grouting pipe (10) and a grouting valve (11); the grouting valve (11) has a group and is arranged corresponding to the grouting hole (2); the grouting valve (11) is T-shaped and comprises a transverse pipe section (11.1) and a longitudinal pipe section (11.2); the longitudinal pipe section (11.2) port of the grouting valve (11) is connected to the grouting hole (2); the number of the grouting pipes (10) is two less than the number of the grouting valves (11), and they are correspondingly connected between the transverse pipe sections (11.1) of adjacent grouting valves (11); the ports at one end of the two grouting valves (11) at the bottom are reserved as slurry injection ports (12); a pre-buried steel pipe (13) is provided on the inner partition (1.2) at a position corresponding to the position through which the grouting pipe (10) passes; The cross section of the pipe section (1.1) is rectangular. There is at least one inner partition (1.2) arranged inside the pipe section (1.1) and dividing the pipe section (1.1) into at least two chambers. One end of the high-pressure water injection ring (9) is threadedly connected to the pump pipe (6), and the other end of the high-pressure water injection ring (9) is threadedly connected to the support pump (5). A group of jacks (14) are respectively provided on both sides of the pipe gallery (1). The jacks (14) are horizontally pressed between the end of the vertical plate of the pipe section (1.1) and the side wall of the working well (7). The construction method includes the following steps: Step 1, manufacturing the pipe gallery (1): prefabricating the inner partition (1.2) and the pipe section (1.1) as a whole in a prefabrication yard, wherein a pre-buried steel pipe (13) is pre-buried in the inner partition (1.2); Step 2: Complete the installation of the pipe jacking machine and the installation of the supporting equipment in the working well (7); Step 3: Arrange a friction-reducing grouting pipe system in the pipe gallery (1): connect the grouting valves (11) to the grouting holes (2) correspondingly, and connect the grouting pipes (10) between adjacent grouting valves (11); wherein no grouting pipe (10) is arranged between the two grouting valves (11) at the bottom, and ports at one end of the two grouting valves (11) are reserved as slurry injection ports (12); Step 4: Install the excavation system; Step 5, the pipe gallery (1) is hoisted into the working well (7) section by section, the jack (14) provides a jacking force to the pipe gallery (1), the pipe jacking machine excavates, the spiral excavator (3) excavates, and at the same time, a friction-reducing grouting pipe system is used to inject grout around the pipe gallery (1) to be jacked, so as to jack the pipe gallery (1); Step six, using a support pump (5) and a pump pipe (6) to transport soil to the working well (7), and at the same time using a high-pressure water injection ring (9) to inject high-pressure water into the pump pipe to reduce the frictional resistance between the soil and the wall of the pump pipe (6); Step 7: During the jacking process, the gap between the inner baffle (1.2) of the jacking tunnel (1) and the inner baffle (1.2) of the tunnel (1) in front of it is sealed by caulking; first, a caulking plate (15) is placed in the gap of the inner baffle (1.2), and then a sealing paste (16) is used to caulk the gap; Step 8: Repeat the process from step 5 to step 7 until all the pipe galleries (1) are pushed into place, and the construction is completed.

2. The construction method of the construction system according to claim 1, characterized in that: The distance between adjacent grouting holes (2) is 1m to 3m.

3. The construction method of the construction system according to claim 1, characterized in that: When the pipe gallery (1) is twisted during the jacking process, step a is further included between step five and step six: using a jack (14) to correct the deviation of the pipe gallery (1).

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