CN109898535B - Prefabricated pipe jacking working well prestress open caisson and assembling method - Google Patents
Prefabricated pipe jacking working well prestress open caisson and assembling method Download PDFInfo
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Abstract
The invention discloses a prefabricated pipe jacking working well prestressed open caisson, belongs to the field of drainage engineering, and particularly relates to the manufacture of a working well open caisson for pipe jacking construction of a drainage pipeline. The open caisson is circular and consists of a plurality of layers of well sections, including a cutting edge section, a pipe orifice section and a standard section, the smallest unit forming each well section is an arc-shaped well plate, and reinforced concrete is adopted for prefabrication. The well plates are prefabricated in factories and transported to a construction site for assembly, the prestressed steel ropes are used for tensioning and fastening, and an annular whole is formed under the tensioning stress action of the prestressed steel ropes after the open caisson is assembled. The defects of long construction period of procedures such as binding reinforcing steel bars, supporting a formwork, pouring concrete, curing concrete and the like in the open caisson manufacturing site in the prior art are overcome, the period of manufacturing the open caisson in site is greatly shortened, and the influence on road traffic is reduced. The open caisson is manufactured by industrial production, and the quality is easy to control.
Description
Technical Field
The invention relates to a prefabricated pipe jacking working well prestressed open caisson and an assembling method, belongs to the field of drainage engineering, and particularly relates to a working well open caisson for pipe jacking construction of a drainage pipeline.
Background
The urban drainage system is divided into two systems, namely a diversion system and a confluence system, and most cities adopt the diversion system, namely the rainwater and the sewage are respectively discharged. The units or living areas along the urban road are organized drainage, rainwater and sewage are collected and drained to a drainage pipeline below the urban road, and then are drained to a water body or a sewage treatment plant through the drainage pipeline. Most of rainwater pipelines in many cities in China are built before 90 s in the last century, the reproduction period basically adopts 0.5-1 year, the standard is low, and the value of the runoff coefficient psi is also low. Along with the development of economy, the urban process is accelerated, the urban construction land area and the hardening area are increased, the rainwater catchment area F and the comprehensive runoff coefficient psi are also increased, the rainwater flow Q is increased, the pipe diameter of the original rainwater pipeline is smaller, and the phenomenon of waterlogging often occurs in urban areas. Some urban construction initial stages are influenced by factors such as funds, and the drainage system adopts a combined system, namely rainwater and sewage are discharged by adopting the same pipeline, and the sewage and the rainwater are directly discharged into a water body together. Along with the development of economy and the enhancement of environmental awareness of people, the original converging pipe is required to be transformed, and the sewage interception flow is treated by a sewage treatment plant and then discharged into a water body. The diversion transformation generally takes the original converging pipe as a rainwater pipe, and newly builds a sewage pipeline to send sewage to a sewage treatment plant. Whether the waterlogging is remedied or the sewage is intercepted, a newly built drainage pipeline needs to be built under the original urban road, and in order to reduce the influence on urban traffic and life of surrounding residents, the newly built drainage pipeline is generally constructed by adopting a pipe jacking method for improving the old urban drainage system.
Most pipe diameters of the pipe jacking method are 800mm or more, namely a soil pressure balance method and a mud water balance method are adopted, and a secondary pipe jacking method is adopted for the pipe jacking method of which the pipe diameter is less than 800 mm. Pipe jacking construction requires that pipe jacking working wells be excavated at the positions of pipeline inspection wells, and pipelines are jacked from one working well to another (receiving wells). The construction method of the working well is determined according to geological conditions and site environment, the most used open caisson is open caisson, and the open caisson of the pipe-jacking working well adopts more circular open caisson except special purpose. The open caisson in the prior art is prefabricated on the ground of a construction site, a concrete well wall with higher strength is used for supporting, the well is excavated and sunk, and finally the bottom is sealed. The drainage pipeline pipe jacking soil pressure balance method, the slurry balance method construction and the secondary pipe jacking method adopt mechanical soil digging, the jacking speed is high, the soil is not the soil of a stratum generally, a 50m well section can be jacked in place generally for 2-3 days, but the period for manufacturing the open caisson on the ground is very long, the formwork is supported, the reinforcing steel bars are bound, the concrete is poured and the concrete is maintained, the sinking can be started only after the design strength is reached, the sinking can be generally completed only about one half month, and the open caisson manufacturing has great influence on surrounding road traffic and urban environment. Under geological conditions such as clay with good soil quality, the pipeline jacking speed is high, and the main factors limiting the construction progress of the jacking pipe are open caisson manufacture and maintenance.
The open caisson is manufactured on site, the support of the inner die and the outer die has larger influence on the overall shape of the open caisson, the height of the open caisson is generally larger, some open caisson can reach 10 meters, the template support is unstable and is easy to deform, the sinking of the open caisson is seriously influenced by the deformation of the poured open caisson, and therefore, the technical requirement for manufacturing the open caisson is higher and the construction difficulty is large.
Disclosure of Invention
The invention aims to provide a prefabricated pipe jacking working well prestressed sunk well and an assembling method, which are suitable for manufacturing the working well sunk well for pipe jacking construction of a drainage pipeline. The round open caisson is more adopted in practical engineering, and is composed of a plurality of layers of well sections, including a cutting edge section, a pipe orifice section and a standard section, wherein the smallest units forming each well section are arc-shaped well plates, and reinforced concrete is adopted for prefabrication. The well plates are prefabricated in factories and transported to a construction site for assembly, the prestressed steel ropes are used for tensioning and fastening, and an annular whole is formed under the tensioning stress action of the prestressed steel ropes after the open caisson is assembled. The beneficial effects are as follows: the defects of long construction period of procedures such as binding reinforcing steel bars, supporting a formwork, pouring concrete, curing concrete and the like in the open caisson manufacturing site in the prior art are overcome, the period of manufacturing the open caisson in site is greatly shortened, and the influence on road traffic is reduced. The open caisson is manufactured by industrial production, and the quality is easy to control.
The invention is realized by the following technology: the prestress open caisson is circular and consists of a plurality of layers of well sections, wherein the prestress open caisson comprises a cutting edge foot section 1, a pipe orifice section 2 and a standard section 3, the smallest units of the cutting edge foot section 1, the pipe orifice section 2 and the standard section 3 are arc-shaped well plates 4, and reinforced concrete is adopted for prefabrication. The open caisson is provided with a cutting edge section 1, a pipe orifice section 2 and a standard section 3 from bottom to top, wherein the well sections are assembled into a ring shape by adopting arc-shaped well plates 4, the ring-shaped well sections are layered and overlapped, the cutting edge section 1 and the pipe orifice section 2 are one layer, at least one layer but not limited to one layer of the standard section 3 can be used for determining the layer number of the standard section 3 according to the height of the open caisson. Each layer of the well section is formed by splicing at least four well plates 4 but not limited to four well plates 4, splicing joints among the well plates 4 are vertical joints 5, and the arc length of each two adjacent layers of vertical joints 5 is 1/4-1/2 of the arc length of the well plates 4, namely, the vertical joints 5 among the well plates 4 of the upper layer are staggered from the vertical joints 5 among the well plates 4 of the next layer by more than 1/4 to the middle position of the well plates 4 so as to ensure good stress. The assembled joints between each layer of well sections are transverse joints 6, vertical joints 5 and transverse joints 6 are fixed by adopting arc-shaped connecting bolts 7, each layer of well sections are tensioned and locked by adopting annular prestressed tendons 8 around assembled annular well sheets 4, the vertical prestressed tendons 8 are tensioned and locked between each layer of well sections, and the annular well sheets 4, the vertical cutting edge sections 1, the pipe orifice sections 2 and the standard sections 3 are assembled into an annular open caisson under the action of prestressed anchor cables.
Each well plate 4 is provided with at least two horizontal annular pore channels 10, each well plate 4 is provided with a tensioning table 11 in each layer of well section, the tensioning table 11 of each layer of well section is placed on the side face of the jacking pipe direction, and the tensioning tables 11 of the upper layer and the lower layer of adjacent well sections are staggered left and right so as to reduce unbalance of the weight of the open caisson. The circumferential prestress rib 8 penetrates into the circumferential duct 10, the circumferential prestress rib 8 extends out of two ends of the tensioning table 11, and the circumferential prestress rib 8 is anchored by the anchor 12. Each well plate 4 is provided with at least two vertical pore canals 13, the vertical pore canals 13 are assembled by staggered joint of the vertical joints 5 of the adjacent well sections, the vertical prestressed tendons 8 penetrate through the vertical pore canals 13, the vertical prestressed tendons 8 of the cutting edge foot section 1 at the lowest end and the standard section 3 at the uppermost end extend out, and the vertical prestressed tendons 8 are anchored by an anchor 12.
The lower part of the blade foot section 1 is provided with an inclined blade foot 14, and the blade foot 14 is used for reducing resistance when sinking into a well. The upper part of the blade foot 14 is provided with a bottom plate groove 15, and the bottom plate groove 15 is used for anchoring the bottom plate when the concrete bottom plate is poured after sinking of the open caisson is completed. The height of the blade foot section 1 is the sum of the height of the blade foot 14 and the height of the bottom plate groove 15 plus 500-1000 mm. At least two well plates 4 of the pipe orifice section 2 are provided with holes 16, and if a branch pipe is connected to the drain pipe at the position of the open caisson, the holes 16 are additionally arranged according to the position of the branch pipe. The inner wall of the well plate 4 provided with the hole 16 is a plane, the plane is convenient for the jacking jack to be used as the back, and the strength of the upper part and the lower part of the hole 16 after the well plate 4 is provided with the hole can be increased. The diameter of the hole 16 is a reserved gap which is twice the outer diameter of the pipe-jacking pipe, the height of the pipe orifice section 2 is the structural height which is 300-1000 mm and is respectively added to the upper and lower parts of the diameter of the hole 16. The height of the standard section 3 is 1000-2000 mm, and can be determined according to the height of the open caisson and the number of layers of the standard section 3.
The vertical seam 5 and the horizontal seam 6 among the blade foot section 1, the pipe orifice section 2 and the standard section 3 are of a tongue-and-groove structure, elastic sealing materials are arranged in the tongue-and-groove seam, and after the well plate 4 is assembled, the well plate is compressed under the fastening of the connecting bolt 7, the annular prestress rib 8 and the vertical prestress rib 8, so that the sealing water stopping effect among the joints is achieved.
The open caisson is assembled and constructed in a factory prefabricating site, then the open caisson is sunk to a design elevation according to a conventional method, and a bottom sealing and a bottom plate are poured. The pre-stressed open caisson assembling method for the prefabricated pipe-jacking working well is to pre-prepare well plates 4 in a factory and convey the well plates to an open caisson construction site for combined assembling, wherein the assembling method is as follows.
1) And (3) measuring and paying off at the sinking position of the open caisson, determining the direction of the pipe-jacking pipeline, and placing a backing plate at the installation position of the open caisson.
2) When the cutting edge foot section 1 is assembled on the backing plate and the first well plate 4 is placed, the center of the hole 16 of the upper pipe orifice section 2 is considered to be coincident with the center line plane of the pipe jacking pipeline, the vertical joint 5 between the well plates 4 of the cutting edge foot section 1 is fixed by the connecting bolt 7, and the cutting edge foot section 1 forms a ring-shaped whole.
3) The pipe orifice section 2 is assembled at the upper part of the cutting edge section 1, the vertical joint 5 of the pipe orifice section 2 is staggered with the vertical joint 5 of the lower cutting edge section 1 by 1/4-1/2 of the arc length of the well plate 4, the center of the hole 16 coincides with the center line plane of the pipe jacking pipeline, the vertical joint 5 between the well plates 4 of the pipe orifice section 2 is fixed by a connecting bolt 7, the transverse joint 6 between the pipe orifice section 2 and the cutting edge section 1 is fixed by the connecting bolt 7, and the pipe orifice section 2 forms an annular whole and is connected with the cutting edge section 1 at the lower part.
4) The standard section 3 is assembled at the upper part of the pipe orifice section 2, the vertical joint 5 of the standard section 3 and the vertical joint 5 of the lower pipe orifice section 2 are staggered by 1/4-1/2 of the arc length of the well plate 4, the vertical joint 5 between the well plates 4 of the standard section 3 is fixed by a connecting bolt 7, and then the transverse joint 6 between the standard section 3 and the pipe orifice section 2 is fixed by the connecting bolt 7, and the standard section 3 forms a ring-shaped whole and is connected with the lower pipe orifice section 2 and the cutting edge section 1.
5) The rest standard sections 3 on the upper part are assembled section by section.
6) The annular prestressed tendons 8 are installed on the assembled well section, the annular prestressed tendons 8 penetrate from one end of an annular duct 10 of a tensioning table 11 and penetrate from the other end of the annular duct, an anchor 12 is installed at a duct opening of one end of the tensioning table 11 to anchor the annular prestressed tendons 8, a tensioning jack is installed at a duct opening of the other end of the tensioning table 11 to tension the annular prestressed tendons 8, the annular prestressed tendons 8 are tensioned according to a designed tensioning value, and the anchor 12 is used for anchoring when the design requirement is met.
7) The vertical prestressed tendons 9 are installed, the vertical prestressed tendons 9 penetrate through the vertical pore canal 13 of the lower cutting edge foot section 1, penetrate out of the vertical pore canal 13 of the uppermost standard section 3, the vertical pore canal 13 opening of the cutting edge foot section 1 is provided with an anchor 12 for anchoring the vertical prestressed tendons 9, the vertical pore canal 13 opening of the uppermost standard section 3 is provided with a tensioning jack for tensioning the vertical prestressed tendons 9, and the vertical prestressed tendons 9 are tensioned according to a designed tensioning value, so that the anchor 12 is used for anchoring when the design requirement is met.
8) Grouting the annular duct 10 and the vertical duct 13.
9) After tensioning, the connecting bolts 7 are fastened one by one, and the openings of the connecting bolts 7 are closed by sealing mortar 17.
And after the sinking well is assembled, sinking construction can be carried out by a sinking method for installing the sinking well.
According to the invention, factory prefabrication of the sunk well adopts factory prefabrication plates, and factory prefabrication can adopt a shaped steel die, so that the geometric dimension of a component is effectively ensured; the well plate adopts steam curing, so that the production efficiency is high, and the quality control is reliable. The well plate field assembly greatly shortens the manufacturing period of the open caisson, and reduces the influence on road traffic. The wall thickness and the steel bar consumption of the open caisson can be reduced by adopting the prestress structure, and the engineering cost is reduced.
Drawings
FIG. 1 is a plan view of the splice of the present invention;
FIG. 2 is a sectional view of the assembled invention (section A-A of FIG. 1);
FIG. 3 is a vertical joint assembly structure large sample;
fig. 4 is a large sample of a transverse seam assembly structure.
In the figure: the device comprises a 1-blade leg section, a 2-pipe orifice section, a 3-standard section, a 4-well plate, a 5-vertical seam, a 6-transverse seam, a 7-connecting bolt, an 8-annular prestress rib, a 9-vertical prestress rib, a 10-annular duct, a 11-tensioning table, a 12-anchor, a 13-vertical duct, a 14-blade leg, a 15-bottom plate groove, a 16-opening and a 17-sealing mortar.
Detailed Description
The open caisson adopts factory prefabricated well plates and is assembled on site. The open caisson is circular after being assembled, and the plan view of the open caisson is shown in figure 1. The open caisson consists of a plurality of layers of well sections, including a cutting edge foot section 1, a pipe orifice section 2 and a standard section 3, wherein the minimum units of the cutting edge foot section 1, the pipe orifice section 2 and the standard section 3 are arc-shaped well plates 4 which are prefabricated by adopting reinforced concrete. The open caisson is provided with a cutting edge section 1, a pipe orifice section 2 and a standard section 3 from bottom to top, the well sections are assembled into a ring shape by adopting arc-shaped well plates 4, the ring-shaped well sections are overlapped in a layered manner, the ring-shaped well plates 4, the vertical cutting edge section 1, the pipe orifice section 2 and the standard section 3 are assembled into a ring-shaped open caisson under the action of a prestressed anchor rope by adopting connecting bolts 7, ring-shaped prestressed tendons 8 and vertical prestressed tendons 8, and a vertical sectional view of the open caisson is shown in figure 2.
The number of layers of the cutting edge foot section 1 and the pipe orifice section 2 is one, the cutting edge foot section 1 has the function of digging soil in a well when the open caisson is in sinking construction, and the open caisson cuts soil body to sink under the action of dead weight (the open caisson needs to be loaded when the dead weight is insufficient); the pipe orifice section 2 coordinates with the elevation of the pipeline of the jacking pipe after sinking is finished, and is provided with an opening 16 which is a channel for ejecting and jacking the pipeline; the common pipe-jacking pipeline is deeper in burial depth, a certain earthing depth is arranged above the pipe top, the upper part of the pipe orifice section 2 of the open caisson extends to the ground by adopting the standard section 3, at least one layer but not limited to one layer of standard section 3 can be used for determining the layer number of the standard section 3 according to the height of the open caisson. Each layer of the well section is formed by splicing at least four well plates 4 but not limited to four well plates 4, the number of the well plates 4 of each layer is calculated according to the diameter and the structure of the open caisson, the wall thickness of the open caisson is determined by combining the weight of transporting and constructing and hoisting one well plate 4, and the weight of one well plate 4 is controlled to be not more than 10 tons.
The assembled joints among the well plates 4 are vertical joints 5, and the arc length of the well plates 4 is 1/4-1/2 of the joint length of the adjacent layers of vertical joints 5, namely, the vertical joints 5 among the well plates 4 of the upper layer are staggered from the vertical joints 5 among the well plates 4 of the next layer of well section by more than 1/4 to the middle position of the well plates 4 so as to ensure good stress. The assembled joints between each layer of well sections are transverse joints 6, vertical joints 5 and the transverse joints 6 are fixed by adopting arc-shaped connecting bolts 7, the assembled structure of the vertical joints 5 is shown in figure 3, and the assembled structure of the transverse joints 6 is shown in figure 4. Each layer of well section is tensioned and locked by adopting a circumferential prestress rib 8 around the well plate 4 assembled into a ring shape, as shown in fig. 1, the well section is horizontally cut along the upper part of the pipe orifice section 2, and the circumferential pore canal 10 and the hole 16 are not cut, which is shown by dotted lines. The vertical prestressed tendons 8 are adopted to stretch and lock the well sections of each layer, as shown in figure 2.
Each well plate 4 is provided with at least two horizontal annular channels 10, and the number of the annular channels 10 of each layer is determined according to the calculation requirement of the prestressed cable structure. A piece of well plate 4 is arranged in each layer of well section, the stretching tables 11 of each layer of well section are placed on the side face of the jacking pipe direction, and the stretching tables 11 of the upper layer of well section and the lower layer of well section are staggered left and right so as to reduce unbalance of the weight of the open caisson. Because the vertical joints 5 of the upper layer and the lower layer are staggered, the stretching tables 11 of the left and right misplacement of the upper layer and the lower layer are not right opposite to the stretching tables 11 of the other side, the thick solid stretching tables 11 drawn at the upper part in fig. 1 are cut into the pipe orifice section 2, the thin solid stretching tables 11 at the left side of the lower part in the drawing are not cut into but visible by the cutting edge foot section 1 at the lower layer, and the stretching tables 11 of the dotted line at the right side are the standard section 3 at the upper layer and represent relative positions by the dotted line because the cutting edge foot section is not cut into and not visible. Each well plate 4 is provided with at least two vertical pore channels 13, and the vertical joints 5 of the adjacent layers of well sections are staggered to assemble the vertical pore channels 13 to be communicated up and down.
The lower part of the blade foot section 1 is provided with an inclined blade foot 14, and the blade foot 14 is used for reducing resistance when sinking into a well. The upper part of the blade foot 14 is provided with a bottom plate groove 15, and the bottom plate groove 15 is used for anchoring the bottom plate when the concrete bottom plate is poured after sinking of the open caisson is completed. The height of the blade foot section 1 is the sum of the height of the blade foot 14 and the height of the bottom plate groove 15 plus 500-1000 mm.
At least two well plates 4 of the pipe orifice section 2 are provided with holes 16, and if a branch pipe is connected to the drain pipe at the position of the open caisson, the holes 16 are additionally arranged according to the position of the branch pipe. The inner wall of the well plate 4 provided with the hole 16 is a plane, the plane is convenient for the jacking jack to be used as the back, and the strength of the upper part and the lower part of the hole 16 after the well plate 4 is provided with the hole can be increased. The diameter of the hole 16 is a reserved gap which is twice the outer diameter of the pipe-jacking pipe, the height of the pipe orifice section 2 is the structural height which is 300-1000 mm respectively above and below the diameter of the hole 16, and the structural height is determined through structural calculation.
The height of the standard section 3 is 1000-2000 mm, and can be determined according to the height of the open caisson and the number of layers of the standard section 3.
The vertical seam 5 and the horizontal seam 6 among the blade foot section 1, the pipe orifice section 2 and the standard section 3 are of a tongue-and-groove structure, elastic sealing materials are arranged in the tongue-and-groove seam, and after the well plate 4 is assembled, the elastic sealing materials are compressed under the fastening of the connecting bolts 7, the annular prestress ribs 8 and the vertical prestress ribs 8, so that the sealing water stopping effect among the joints is achieved.
And after the well sections are assembled, installing and tensioning the prestressed steel cable. The circumferential prestressed tendons 8 penetrate into the circumferential duct 10, the circumferential prestressed tendons 8 extend out from two ends of the tensioning table 11, the circumferential prestressed tendons 8 at one end are anchored by the anchor 12, the circumferential prestressed tendons 8 at the other end are tensioned by the tensioning jack, and the anchoring is performed after the design value is reached. The vertical prestressed tendons 8 penetrate into the vertical pore canal 13, the vertical prestressed tendons 8 of the cutting edge foot section 1 at the lowest end and the standard section 3 at the uppermost end extend out, the vertical prestressed tendons 8 are anchored at the vertical pore canal 13 opening of the cutting edge foot section 1 by using an anchor 12, the vertical prestressed tendons 8 are tensioned at the vertical pore canal 13 opening at the uppermost end by using a tensioning jack, and the vertical prestressed tendons 8 are anchored after reaching a design value. The well plate 4 is assembled into an annular open caisson under the action of the annular prestressed tendons 8 and the vertical prestressed tendons 8.
The well plate 4 is provided with annular and vertical common steel bars according to structural calculation, HRB400 ribbed steel bars are adopted, prestressed anchor cables are prestressed steel strands, annular pore channels 10 and vertical pore channels 13 are bound on the common steel bars by adopting steel corrugated pipes, the annular pore channels 10 are embedded in the well plate 4 when concrete is poured, and the steel corrugated pipes at the intersection of the tensioning tables 11 are vertically staggered and bound together.
According to the implementation of the invention, the diameter of the open caisson and the construction size of the cutting edge are calculated according to the pipe diameter of the pipe according to the technical regulations of pipe jacking of water supply and drainage engineering (CECS 246), and the structure of the open caisson is calculated according to the structural design regulations of reinforced concrete open caisson of water supply and drainage engineering (CECS 137) and the structural design regulations of concrete (GB 50010). The number of the Duan Jing wells 4 of each layer is preferably even, and the number is determined according to the field hoisting equipment and the field. Because the vertical joints 5 of the adjacent layers of well sections are staggered to assemble the vertical channels 13 to be communicated up and down, the number and the arrangement positions of the vertical channels 13 arranged on each well plate 4 are coordinated, and the central angle of the well plate 4 relative to the round open caisson and the central angle of the vertical channels 13 are required to be coordinated, so that the communication of the vertical channels 13 can be ensured.
Examples: according to the calculated inner diameter of the open caisson of 5000mm, the wall thickness of 700mm, the height of the open caisson of 8000mm and the pipe diameter of the jacking pipe of 1200mm. The height of the cutting edge foot section 1 is 1300mm, the outer diameter of the pipe is 1200+2x120=1440, a gap of 50mm is reserved, the diameter of the hole 16 is 1540mm, the height of the structure above and below the hole is calculated to be 450mm, 480mm is taken, and the height of the pipe orifice section 2 is 2500mm. The pipe orifice section 2 is a key for controlling the weight of the well plate 4, each layer of well section is assembled in eight pieces, the central angle of each piece is 45 degrees, the weight of one well plate 4 of the pipe orifice section 2 is about 9.8 tons, and a 30-ton crane can be used for loading and unloading and assembling and hoisting. The remaining 4200mm of the upper part is divided into three standard sections 3, each 1400mm in height. Eight layers of each well section are assembled, the central angle is 45 degrees, two vertical pore canal 13 are arranged on each layer, the central angle between the vertical pore canal 13 is 22.5 degrees, the central angle between the vertical pore canal 13 and the vertical joint 5 is 11.25 degrees, the vertical joint 5 of the upper and lower layers of well sections is staggered by 1/2 of the arc length of the well section 4, namely the arc length of the staggered half well section 4, and the central angle between the vertical pore canal 13 of two adjacent well sections 4 is 22.5 degrees, so that the requirement of staggered penetration is met.
When special conditions such as branch pipe access are met, the well plates 4 can be unequal, one or more well plates 4 can be properly adjusted, the holes 16 of the branch pipes are positioned in the middle of one well plate 4, and the two sides are ensured to have enough construction width. If the pipe diameter of the pipe jacking is larger, the height of the pipe orifice section 2 is too large, so that one well plate 4 is too heavy, the well plate 4 with the hole 16 can be controlled according to the required construction width added on two sides of the diameter of the hole 16, because the hole is formed, the number of the well plates 4 of the rest pipe orifice section 2 is increased slightly, the arc length of each plate can be controlled according to the weight, the well plate 4 with the hole 16 can be made into a whole plate, the rest plates are divided into two layers up and down, and the combination is carefully calculated by considering the staggered joint of the vertical joints 5 and the penetration of the vertical pore canal 13.
The pre-stressed open caisson assembling method for the prefabricated pipe-jacking working well is to pre-prepare well plates 4 in a factory and convey the well plates to an open caisson construction site for combined assembling, wherein the assembling method is as follows.
1) And (3) measuring and paying off at the sinking position of the open caisson, determining the direction of the pipe-jacking pipeline, and placing a backing plate at the installation position of the open caisson.
2) When the cutting edge foot section 1 is assembled on the backing plate and the first well plate 4 is placed, the center of the hole 16 of the upper pipe orifice section 2 is considered to be coincident with the center line plane of the pipe jacking pipeline, the vertical joint 5 between the well plates 4 of the cutting edge foot section 1 is fixed by the connecting bolt 7, and the cutting edge foot section 1 forms a ring-shaped whole.
3) The pipe orifice section 2 is assembled at the upper part of the cutting edge section 1, the vertical joint 5 of the pipe orifice section 2 is staggered with the vertical joint 5 of the lower cutting edge section 1 by 1/4-1/2 of the arc length of the well plate 4, the center of the hole 16 coincides with the center line plane of the pipe jacking pipeline, the vertical joint 5 between the well plates 4 of the pipe orifice section 2 is fixed by a connecting bolt 7, the transverse joint 6 between the pipe orifice section 2 and the cutting edge section 1 is fixed by the connecting bolt 7, and the pipe orifice section 2 forms an annular whole and is connected with the cutting edge section 1 at the lower part.
4) The standard section 3 is assembled at the upper part of the pipe orifice section 2, the vertical joint 5 of the standard section 3 and the vertical joint 5 of the lower pipe orifice section 2 are staggered by 1/4-1/2 of the arc length of the well plate 4, the vertical joint 5 between the well plates 4 of the standard section 3 is fixed by a connecting bolt 7, and then the transverse joint 6 between the standard section 3 and the pipe orifice section 2 is fixed by the connecting bolt 7, and the standard section 3 forms a ring-shaped whole and is connected with the lower pipe orifice section 2 and the cutting edge section 1.
5) The rest standard sections 3 on the upper part are assembled section by section.
6) The annular prestressed tendons 8 are installed on the assembled well section, the annular prestressed tendons 8 penetrate from one end of an annular duct 10 of a tensioning table 11 and penetrate from the other end of the annular duct, an anchor 12 is installed at a duct opening of one end of the tensioning table 11 to anchor the annular prestressed tendons 8, a tensioning jack is installed at a duct opening of the other end of the tensioning table 11 to tension the annular prestressed tendons 8, the annular prestressed tendons 8 are tensioned according to a designed tensioning value, and the anchor 12 is used for anchoring when the design requirement is met.
7) The vertical prestressed tendons 9 are installed, the vertical prestressed tendons 9 penetrate through the vertical pore canal 13 of the lower cutting edge foot section 1, penetrate out of the vertical pore canal 13 of the uppermost standard section 3, the vertical pore canal 13 opening of the cutting edge foot section 1 is provided with an anchor 12 for anchoring the vertical prestressed tendons 9, the vertical pore canal 13 opening of the uppermost standard section 3 is provided with a tensioning jack for tensioning the vertical prestressed tendons 9, and the vertical prestressed tendons 9 are tensioned according to a designed tensioning value, so that the anchor 12 is used for anchoring when the design requirement is met.
8) Grouting the annular duct 10 and the vertical duct 13.
9) After tensioning, the connecting bolts 7 are fastened one by one, the openings of the connecting bolts 7 are closed by sealing mortar 17, and the mortar adopts epoxy resin mortar.
And after the sinking well is assembled, sinking construction can be performed according to a sinking method of the sinking well.
The circular open caisson is only one embodiment, whether square, rectangular or other shapes, and all open caisson with pipe jacking working which is integrally anchored by stretching prestressed steel ropes are within the protection scope of the present application as long as the open caisson is prefabricated and assembled by well plates.
Claims (5)
1. A prefabricated pipe jacking working well prestress open caisson is characterized in that: the open caisson is circular and is formed by multiple layers of well sections, the open caisson comprises a cutting edge foot section (1), a pipe orifice section (2) and a standard section (3), the cutting edge foot section (1), the pipe orifice section (2) and the standard section (3) are formed by arc-shaped well pieces (4), reinforced concrete is adopted for prefabrication, the open caisson is provided with the cutting edge foot section (1), the pipe orifice section (2) and the standard section (3) from bottom to top, annular well sections are layered and overlapped, the number of layers of the cutting edge foot section (1) and the pipe orifice section (2) is one, at least one layer but not limited to one layer of the standard section (3), each layer of the well sections is formed by splicing at least four layers but not limited to four well pieces (4), a splicing joint between the well pieces (4) is a vertical joint (5), the splicing joint between each layer of well pieces is a transverse joint (6), the vertical joint (5) and the transverse joint (6) adopt arc-shaped connecting bolts (7) to fix the adjacent well pieces (4), each layer of well pieces are wound into a circle to form annular well pieces (4), one circle and the annular pre-stress tendons (8) are adopted between the vertical pre-stress tendons (9);
each well plate (4) is provided with at least two horizontal annular pore passages (10), each well plate (4) is provided with a tensioning table (11) in each layer of well section, the annular prestressed tendons (8) penetrate into the annular pore passages (10), the annular prestressed tendons (8) extend out from two ends of the tensioning table (11), and the annular prestressed tendons (8) are anchored by an anchor device (12); each well plate (4) is provided with at least two vertical pore canals (13), the vertical slits (5) of the adjacent well sections are spliced and communicated up and down, the vertical prestressed tendons (9) penetrate the vertical pore canals (13), the vertical prestressed tendons (9) extend out from the cutting edge foot section (1) at the lowest end and the standard section (3) at the uppermost end, and the vertical prestressed tendons (9) are anchored by an anchor device (12); the annular pore canal (10) and the vertical pore canal (13) are bound on common steel bars by adopting steel corrugated pipes, and are pre-buried in the well plate (4) when concrete is poured, and the steel corrugated pipes of the annular pore canal (10) are bound together at the intersection of the tensioning tables (11) in an up-and-down staggered manner;
the pipe orifice section (2) is provided with at least two well plates (4) with holes (16), the inner wall of the well plate (4) with the holes (16) is a plane, the diameter of the holes (16) is a reserved gap which is twice the outer diameter of the pipe jacking pipe, the height of the pipe orifice section (2) is the structural height of the upper part and the lower part of the diameter of the holes (16), and the structural height is 300-1000 mm;
the vertical slots (5) of the adjacent layers are staggered to assemble the vertical channels (13) to be communicated up and down, the number and the arrangement positions of the vertical channels (13) arranged on each well plate (4) are coordinated, the arc length of each vertical slot (5) of the adjacent layers is 1/4-1/2 of the arc length of each well plate (4), and the central angles of the well plates (4) relative to the round open caisson are coordinated with the central angles of the vertical channels (13) to ensure the communication of the vertical channels (13);
the annular well plate (4), the vertical blade foot section (1), the pipe orifice section (2) and the standard section (3) are assembled into an annular open caisson under the action of the prestress anchor.
2. The prefabricated pipe-jacking working well prestressed sunk well of claim 1, wherein: the lower part of the blade foot section (1) is provided with an inclined blade foot (14), the upper part of the blade foot (14) is provided with a bottom plate groove (15), and the height of the blade foot section (1) is 500-1000 mm in addition to the sum of the heights of the blade foot (14) and the bottom plate groove (15).
3. The prefabricated pipe-jacking working well prestressed sunk well of claim 1, wherein: the height of the standard section (3) is 1000-2000 mm.
4. The prefabricated pipe-jacking working well prestressed sunk well of claim 1, wherein: the vertical seam (5) and the transverse seam (6) among the blade foot section (1), the pipe orifice section (2) and the standard section (3) are of a tongue-and-groove seam structure, and elastic sealing materials are arranged in the tongue-and-groove seam.
5. A method for assembling a prestressed open caisson of a prefabricated pipe-jacking working well according to claim 1, which is characterized in that: the assembling method is to prefabricate well plates (4) in factories, transport the well plates to a sunk well construction site for combined assembling, and the assembling method is as follows:
1) Measuring and paying off at the sinking position of the open caisson, determining the direction of the pipe-jacking pipeline, and placing a backing plate at the installation position of the open caisson;
2) Assembling the blade foot sections (1) on the backing plate, considering that the center of the hole (16) of the pipe orifice section (2) above coincides with the center line plane position of the pipe jacking pipeline when the first well sheet (4) is placed, fixing the vertical joints (5) between the well sheets (4) of the blade foot sections (1) by using connecting bolts (7), and forming an annular whole by the blade foot sections (1);
3) Assembling a pipe orifice section (2) at the upper part of a cutting edge section (1), wherein a vertical joint (5) of the pipe orifice section (2) is staggered with the vertical joint (5) of the lower cutting edge section (1) by 1/4-1/2 of the arc length of a well plate (4), the center of a hole (16) coincides with the plane of the central line of a pipe jacking pipeline, fixing the vertical joint (5) between the well plates (4) of the pipe orifice section (2) by using a connecting bolt (7), fixing a transverse joint (6) between the pipe orifice section (2) and the cutting edge section (1) by using the connecting bolt (7), and the pipe orifice section (2) forms an annular whole and is connected with the lower cutting edge section (1);
4) Assembling a standard section (3) at the upper part of the pipe orifice section (2), staggering 1/4-1/2 of the arc length of the vertical joint (5) of the standard section (3) and the vertical joint (5) of the lower pipe orifice section (2), fixing the vertical joint (5) between the well plates (4) of the standard section (3) by using a connecting bolt (7), fixing a transverse joint (6) between the standard section (3) and the pipe orifice section (2) by using the connecting bolt (7), and connecting the standard section (3) with the lower pipe orifice section (2) and the cutting edge section (1);
5) Assembling the rest standard sections (3) at the upper part section by section;
6) Installing a circumferential prestressed rib (8) on the assembled well section, penetrating the circumferential prestressed rib (8) from one end of a circumferential duct (10) of a tensioning table (11) and penetrating the circumferential prestressed rib from the other end, installing an anchor (12) at one duct opening of the tensioning table (11) to anchor the circumferential prestressed rib (8), installing a tensioning jack at the other duct opening of the tensioning table (11) to tension the circumferential prestressed rib (8), and tensioning according to a designed tensioning value, wherein the anchor (12) is used for anchoring when the design requirement is met;
7) Installing a vertical prestressed tendon (9), penetrating the vertical prestressed tendon (9) from a vertical pore canal (13) of a lower cutting edge foot section (1), penetrating out from the vertical pore canal (13) of the uppermost standard section (3), installing an anchor (12) at the opening of the vertical pore canal (13) of the cutting edge foot section (1) to anchor the vertical prestressed tendon (9), installing a tensioning jack at the opening of the vertical pore canal (13) of the uppermost standard section (3) to tension the vertical prestressed tendon (9), and tensioning according to a designed tensioning value, wherein the anchor (12) is used for anchoring when the design requirement is met;
8) Grouting the annular pore channel (10) and the vertical pore channel (13);
9) After tensioning, the connecting bolts (7) are fastened one by one, and the openings of the connecting bolts (7) are closed by sealing mortar (17).
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