CN113090277A - Batch jacking discrete pipe row uninterrupted tensioning forming integral frame and construction method - Google Patents
Batch jacking discrete pipe row uninterrupted tensioning forming integral frame and construction method Download PDFInfo
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- CN113090277A CN113090277A CN202110353973.3A CN202110353973A CN113090277A CN 113090277 A CN113090277 A CN 113090277A CN 202110353973 A CN202110353973 A CN 202110353973A CN 113090277 A CN113090277 A CN 113090277A
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- 238000010276 construction Methods 0.000 title claims abstract description 29
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 90
- 239000010959 steel Substances 0.000 claims abstract description 90
- 239000002689 soil Substances 0.000 claims abstract description 9
- 239000010410 layer Substances 0.000 claims abstract description 4
- 239000002356 single layer Substances 0.000 claims abstract description 4
- 239000002344 surface layer Substances 0.000 claims abstract description 4
- 238000005452 bending Methods 0.000 claims description 21
- 210000002435 tendon Anatomy 0.000 claims description 9
- 238000010586 diagram Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 238000004873 anchoring Methods 0.000 claims description 3
- 230000035515 penetration Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/10—Making by using boring or cutting machines
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/08—Lining with building materials with preformed concrete slabs
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention discloses a batch jacking discrete pipe row uninterrupted tensioning integrated frame and a construction method, which are used for a single-span single-layer box type section structure, wherein an outer steel strand and an inner steel strand are arranged on the outer side and the inner side of the section structure; the outer steel strand and the inner steel strand adopt pulley blocks to complete stress direction switching at corners of a top plate, a bottom plate and a side wall of a box-shaped section to form a closed ring; and adopting full-section one-time tensioning, and completing tensioning of the outer steel strands and the inner steel strands arranged on the outer side and the inner side of the section in the same tensioning working pipe joint. During construction, the jacking of all pipe joints is completed by using a pipe jacking machine; then, inserting construction of the steel strand is carried out; after finishing, pouring concrete in all the pipe joints; and after the concrete in all the pipe joints reaches the designed strength, excavating an internal soil body, and applying a lining, a waterproof layer and a building surface layer. The application of the invention realizes that discrete tube rows are jacked in batches in soft soil areas and the anchor points are transversely tensioned to form an integral frame.
Description
Technical Field
The invention relates to the technical field of pipe jacking construction, in particular to an integral frame formed by batch jacking of discrete pipe rows through uninterrupted tensioning and a construction method.
Background
The URT (Under Road/Road tunneling method) construction method originally originated in Japan, and is an underground excavation construction method mainly used for underground works with high environmental protection requirements such as underpass of existing railways or roads. According to official data, 138 projects, the maximum width of 44.8m, the maximum height of 7.5m, the maximum length of 77m, the soil covering range of 0.1 m-11.5 m and the completion time of 63 years have been completed in Japan, and the operation is good up to now. The construction method mainly comprises three forms, namely a lower road truss construction method (portal frame), a tunnel structure form (circular or similar rectangular) and a box structure form (rectangular closed). The box-type structure construction sequence is that firstly discrete pipe rows are jacked in batches to form a rectangular box-type structure section, after concrete is filled in each pipe section of the pipe rows, prestress is introduced between adjacent rectangular steel pipes to enable the adjacent rectangular steel pipes to be integrated to form an initial support, and the initial support is also used as a permanent structure.
Under the construction mode, independent prestressed steel strands are arranged in each structural member (a top plate, a bottom plate and a side wall) in the rectangular section according to the stress state, and a working pipe joint needs to be arranged beside the corner pipe joint in order to meet the requirement of the tensioning operation space of the prestressed steel strands. The working pipe section is formed by independently arranging one part for each structural component, the vertical working pipe is generally arranged at the bottom through a deepened working well, and the horizontal working pipe is independently arranged outside the section. Under this kind of construction mode, the work pipe is more and need be special to be set up, has reduced construction work efficiency and economic nature.
In addition, each component prestressed steel strand is tensioned respectively, the problem of prestress loss caused by the tensioning sequence needs to be considered, and the general principle is that a long strand is tensioned firstly, and a short strand is tensioned later (excessive prestress loss of the short strand is avoided); when the same section is tensioned, the principle of symmetry and inside-out is followed. The tensioning sequence principle is complex, the construction is complicated, and the engineering quality is not easy to ensure.
And thirdly, the prestressed steel strand is usually set into a curve form according to the shape of a bending moment envelope graph, the construction is difficult, the actual rigidity at the corner of the channel can deviate from the theoretical calculation, the zero position of the bending moment can also change correspondingly, and the actual operation difficulty is high.
Therefore, how to realize that discrete tube rows are jacked in batches in a soft soil area and the integral frame is formed by transversely tensioning the uninterrupted anchor points becomes a technical problem which needs to be solved by the technical personnel in the field.
Disclosure of Invention
In view of the defects in the prior art, the invention provides the integral frame formed by batch jacking of the discrete pipe rows through uninterrupted tensioning and the construction method, and aims to realize the purpose of forming the integral frame by batch jacking of the discrete pipe rows through uninterrupted transverse tensioning of anchor points in soft soil areas, further promote the technical progress of the industry and have good economic and social benefits.
In order to achieve the purpose, the invention discloses a method for continuously stretching discrete pipe rows in batches to form an integral frame, which is used for a single-span single-layer box type section structure, wherein steel strands are respectively arranged on the outer side and the inner side of the section structure and used for bearing the positive bending moment and the negative bending moment of the section structure, and the steel strands are annular;
the steel strand positioned on the outer side of the section is an outer steel strand, and the steel strand positioned on the inner side of the section is an inner steel strand; the outer steel strand and the inner steel strand are both arranged in the pipe joint;
the pipe joints comprise standard pipe joints, corner pipe joints and tensioning working pipe joints;
the outer steel strand and the inner steel strand adopt pulley blocks to complete stress direction switching at corners of a top plate, a bottom plate and a side wall of the box-shaped section to form a closed ring;
the pulley block comprises an outer side pulley and an inner side pulley;
when in tensioning, the full-section one-time tensioning is adopted, the outer side steel strand and the inner side steel strand which are arranged on the outer side and the inner side of the section are positioned in the same tensioning working pipe joint to finish tensioning.
Preferably, the outer side steel strand and one end of the inner side steel strand are fixed through a fixed anchoring end on the standard pipe joint, and the other end of the outer side steel strand penetrates all the pipe joints as a tensioning working end and then reaches the tensioning working pipe joint.
Preferably, the tensioning work pipe sections are arranged at the bottom plate distance span 1/4-3/4 of the section.
Preferably, each standard pipe joint and each pipe wall of the corner pipe joint are provided with an outer steel strand preformed hole and an inner steel strand preformed hole for penetrating the outer steel strand and the inner steel strand
The invention also provides a construction method for forming the integral frame by jacking the discrete pipe rows in batches and continuously tensioning, which comprises the following steps:
each section structure is provided with one outer steel strand and one inner steel strand;
and 5, excavating an internal soil body after the concrete in all the pipe joints reaches the design strength, and applying a lining, a waterproof layer and a building surface layer.
Preferably, in the step 3, the tension of the prestressed tendon is determined by calculation according to the bending moment envelope diagram of the cross section and the longitudinal distance between the prestressed tendons, wherein the prestress of the outer steel strand is determined according to the maximum negative bending moment, and the prestress of the inner steel strand is determined according to the maximum positive bending moment.
The invention has the beneficial effects that:
the application of the invention realizes that the discrete tube rows are jacked in the soft soil area in batches and are transversely tensioned without interruption to form an integral frame, thereby promoting the technical progress of the industry and having good economic and social benefits.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
Fig. 1 shows a schematic structural diagram of an embodiment of the present invention.
Fig. 2 shows a schematic structural diagram of a standard pipe joint in an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a corner pipe joint according to an embodiment of the present invention.
Fig. 4 shows a schematic structural diagram of the outer steel strand and the inner steel strand in an embodiment of the present invention.
Detailed Description
Examples
As shown in fig. 1 to 4, discrete tube banks are jacked in batches and continuously tensioned to form an integral frame for a single-span single-layer box-type section structure, steel strands are respectively arranged on the outer side and the inner side of the section structure and used for bearing the positive bending moment and the negative bending moment of the section structure, and the steel strands are all annular;
the steel strand positioned on the outer side of the section is an outer steel strand 3, and the steel strand positioned on the inner side of the section is an inner steel strand 4; the outer side steel strand 3 and the inner side steel strand 4 are both arranged in the pipe joint;
the pipe joints comprise standard pipe joints 1, corner pipe joints 2 and tensioning working pipe joints 7;
the outer side steel strand 3 and the inner side steel strand 4 adopt pulley blocks to complete stress direction switching at corners of a top plate, a bottom plate and a side wall of a box-shaped section to form a closed ring shape;
the pulley block comprises an outer side pulley 5 and an inner side pulley 6;
during tensioning, the full-section one-time tensioning is adopted, and the outer steel strands 3 and the inner steel strands 4 which are arranged on the outer side and the inner side of the section are tensioned in the same tensioning working pipe joint 7.
The principle of the invention is as follows:
1. the outer side steel strand 3 and the inner side steel strand 4 which are annular are respectively arranged on the outer side and the inner side of the cross section and used for dealing with positive bending moment and negative bending moment of the full section, the pre-stress of the outer side steel strand 3 and the pre-stress of the inner side steel strand 4 are respectively determined according to the maximum values of the positive bending moment and the negative bending moment, the calculation is simple and convenient, and the stress system is clear.
2. The outer side steel strand 3 and the inner side steel strand 4 are in a linear stress state in each span, and are bent only at corners through pulley blocks, so that the shape is simple, the resistance during tensioning is small, and the prestress loss is small.
3. Compared with the prior art, the method avoids the problem that the implementation of the anchor cable is difficult when the anchor cable is curved in the vertical direction.
4. The whole section is stretched at one time, so that the problem of prestress loss caused by a construction path and a stretching sequence is solved.
5. Only two steel strands, namely the outer steel strand 3 and the inner steel strand 4, are arranged on each section, and only two times of tensioning operation are needed, so that the tensioning operation times are greatly reduced, and the construction efficiency and the prestress application reliability are improved.
6. Two times of tensioning operation can be completed in the same tensioning operation pipe joint 7, only one tensioning operation pipe joint needs to be arranged on the whole section, the position of the tensioning operation pipe joint can be selected from the inner pipe joint of the section, independent arrangement is not needed, and the construction flexibility and the adaptability are high.
7. The standard version degree of the pipe joint is high. Except the corner pipe joint 2, the threading hole sites of other pipe joints are uniform, holes can be punched in advance when the pipe joints are prefabricated in a factory, on-site punching is not needed, and punching precision and construction efficiency are improved.
All pipe joints, including the standard pipe joint 1, the corner pipe joint 2 and the tensioning working pipe joint 7, are in the same outline form, and the same set of pipe jacking machine can be adopted for construction, so that the mechanical in-out cost is reduced.
In some embodiments, one end of each of the outer steel strand 3 and the inner steel strand 4 is fixed on the standard pipe joint 1 adjacent to the tensioning working pipe joint 7 through a fixed anchoring end 8, and the other end of each of the outer steel strand and the inner steel strand passes through all the pipe joints as a tensioning working end 9 and then reaches the tensioning working pipe joint 7.
In some embodiments, the tensioned work tube segments 7 are positioned at the floor distance span 1/4 to 3/4 of the cross section.
In some embodiments, the pipe wall of each standard pipe joint 1 and each corner pipe joint 2 is provided with an outer steel strand preformed hole 11 and an inner steel strand preformed hole 12 for penetrating the outer steel strand 3 and the inner steel strand 4
The invention also provides a construction method for forming the integral frame by jacking the discrete pipe rows in batches and continuously tensioning, which comprises the following steps:
each section structure is provided with an outer steel strand 3 and an inner steel strand 4;
and 5, excavating an internal soil body after the concrete in all the pipe joints reaches the design strength, and applying a lining, a waterproof layer and a building surface layer.
In some embodiments, in step 3, the tension of the tendon is determined by calculation according to a bending moment envelope diagram of the cross section and the longitudinal distance between the tendons, wherein the prestress of the outer strand 3 is determined according to the maximum negative bending moment, and the prestress of the inner strand 4 is determined according to the maximum positive bending moment.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (6)
1. The method is characterized in that the method is used for a single-span single-layer box type section structure, steel strands are respectively arranged on the outer side and the inner side of the section structure and used for bearing positive bending moment and negative bending moment of the section structure, and the steel strands are all annular;
the steel strand positioned on the outer side of the section is an outer steel strand (3), and the steel strand positioned on the inner side of the section is an inner steel strand (4); the outer side steel strand (3) and the inner side steel strand (4) are both arranged in the pipe joint;
the pipe joint comprises a standard pipe joint (1), a corner pipe joint (2) and a tensioning working pipe joint (7);
the outer side steel strand (3) and the inner side steel strand (4) adopt pulley blocks to complete stress direction switching at corners of a top plate, a bottom plate and a side wall of the box-shaped section to form a closed ring shape;
the pulley block comprises an outer side pulley (5) and an inner side pulley (6);
when in tensioning, the full-section one-time tensioning is adopted, the outer side steel strand (3) and the inner side steel strand (4) which are arranged on the outer side and the inner side of the section are positioned in the same tensioning working pipe joint (7) to complete tensioning.
2. A batch jacking discrete pipe row tension-free forming integral frame according to claim 1, wherein one end of each of the outer steel strand (3) and the inner steel strand (4) is fixed on the standard pipe joint (1) adjacent to the tension working pipe joint (7) through a fixed anchoring end (8), and the other end passes through all the pipe joints as a tension working end (9) and reaches the tension working pipe joint (7).
3. A batch-wise jacking discrete pipe row without interruption tensioned forming a unitary frame according to claim 1, wherein said tensioning work pipe sections (7) are arranged at the floor distance span 1/4 to 3/4 of said section.
4. A batch jacking discrete pipe string tension-free integral frame as claimed in claim 1, wherein the pipe wall of each standard pipe section (1) and each corner pipe section (2) is provided with an outer strand preformed hole (11) and an inner strand preformed hole (12) for passing through the outer strand (3) and the inner strand (4).
5. The method of batch jacking discrete pipe rows into a unitary frame without intermittent tension forming as claimed in claim 1, comprising the steps of:
step 1, using a pipe jacking machine to finish jacking all pipe joints, and arranging one tensioning working pipe joint (7);
step 2, completing the penetration construction of the steel strands in all the pipe joints;
each section structure is provided with one outer steel strand (3) and one inner steel strand (4);
step 3, completing the prestressed tendon tensioning operation in the tensioning working pipe joint (7);
step 4, pouring concrete in all the pipe joints;
and 5, excavating an internal soil body after the concrete in all the pipe joints reaches the design strength, and applying a lining, a waterproof layer and a building surface layer.
6. The construction method for forming the integral frame by jacking and discrete tube bundle in batches without interruption according to the claim 5, wherein in the step 3, the tension force of the prestressed tendons is calculated and determined according to the bending moment envelope diagram of the cross sections and the longitudinal spacing of the prestressed tendons, wherein the pre-stress of the outer steel strand (3) is determined according to the maximum value of negative bending moment, and the pre-stress of the inner steel strand (4) is determined according to the maximum value of positive bending moment.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110353973.3A CN113090277A (en) | 2021-04-01 | 2021-04-01 | Batch jacking discrete pipe row uninterrupted tensioning forming integral frame and construction method |
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| CN202110353973.3A CN113090277A (en) | 2021-04-01 | 2021-04-01 | Batch jacking discrete pipe row uninterrupted tensioning forming integral frame and construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114109448A (en) * | 2021-11-18 | 2022-03-01 | 上海铁能建设工程有限公司 | Pre-tensioning combined steel pipe curtain and construction method thereof |
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2021
- 2021-04-01 CN CN202110353973.3A patent/CN113090277A/en active Pending
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| Title |
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| CN114109448A (en) * | 2021-11-18 | 2022-03-01 | 上海铁能建设工程有限公司 | Pre-tensioning combined steel pipe curtain and construction method thereof |
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