Construction method for long-distance arched reinforced concrete subdivision structure of shield pipe gallery section

Abstract

The invention discloses a construction method for a long-distance arched reinforced concrete subdivision structure of a shield pipe gallery interval. The construction method comprises the following steps: 1) binding reinforcing steel bars of a bottom plate and an arch wall; (2) bottom plate concrete is poured; (3) mounting an arch wall template, wherein the arch wall template adopts a circumferentially spliced shaped steel template; (4) an all-round scaffold is erected on the bottom plate, and the subdivision structure formwork is supported through the scaffold; (5) middle plate steel bars are bound; and 6) pouring the arch wall and the middle plate. The length of a single construction section can be increased from more than ten meters to more than one hundred meters, the construction speed is high, segmented and partitioned line production can be adopted, and the construction period can be greatly shortened; it can be guaranteed that the concrete slump meets the requirement, and the concrete forming quality is guaranteed. And meanwhile, the curvature and the gradient of the pipe gallery are not limited, and the method can be suitable for pipe gallery subdivision projects with large curvature and large gradient. And the side wall shaping steel formworks and the all-round scaffolds are used for supporting, the geometric accuracy of the subdivision structure can be improved, and then the engineering quality is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of underground comprehensive pipe gallery construction, and specifically relates to a construction method for a long-distance arched reinforced concrete compartment structure in a shield pipe gallery section. Background Art

[0002] Traditional compartment structure concrete projects usually use hydraulically movable prefabricated steel formwork compartment trolleys for construction. During construction, the corridor is divided into multiple construction sections according to the length of the trolley. The length of a single construction section is more than ten meters, the single advancement distance is short, multiple pouring is required, and the construction speed is slow. Due to the long interval of the shield corridor, the general trolley length cannot meet the construction progress requirements. In addition, trolley construction is not suitable for corridor sections with large curvature and slope. Summary of the invention

[0003] In order to solve the technical problems existing in the known technology, the present invention provides a method for constructing a long-distance arched reinforced concrete compartment structure in a shield tunnel section. The method can shorten the construction period and is applicable to tunnel compartment projects with large curvature and slope.

[0004] The technical solution adopted by the present invention to solve the technical problems existing in the known technology is: a method for constructing a long-distance arched reinforced concrete compartment structure in a shield tunnel section, which adopts the following steps: 1) tying the bottom plate and the arch wall steel bars; 2) pouring the bottom plate concrete; 3) installing the arch wall formwork, and the arch wall formwork adopts a circumferentially spliced ​​fixed steel formwork; 4) setting up a full-height scaffolding on the bottom plate, using the scaffolding to support the arch wall formwork, and laying the middle plate bottom formwork on the scaffolding; 5) tying the middle plate steel bars; 6) pouring the arch wall and the middle plate.

[0005] On the basis of the above scheme, the present invention also makes the following improvements:

[0006] In the step 2), a limiting groove extending longitudinally is arranged in the center of the bottom plate; in the step 4), the scaffold is provided with an intermediate vertical pole, and the bottom of the intermediate vertical pole is fixed in the limiting groove of the bottom plate.

[0007] In the step 3), the arch wall formwork has a rib extending longitudinally along the pipe gallery on the back and a fixed foot extending outward on the bottom. In the step 4), the fixed foot of the arch wall formwork is fixed on the top by using a sweeping rod of a scaffolding, and the sweeping rod of the scaffolding is fixed to the base plate by using anchor steel bars; the rib of the arch wall formwork is supported by an adjustable side bracket of the scaffolding, and the adjustable side bracket is connected to a horizontal bar or an inclined bar.

[0008] In the step 3), a 10 mm 1 / 4 arc is provided on the upper end of the arch wall template.

[0009] In the step 3), a circumferential back rib is arranged in the middle of each shaped steel template, and two back ribs are arranged longitudinally.

[0010] In the step 3), the shaped steel formworks constituting the arch wall formworks are connected by bolts.

[0011] In the step 3), ribs are arranged on the joints of the arch wall formwork.

[0012] In the step 2), the bottom plate concrete is poured at one time. According to the actual situation of the slope naturally formed during pumping and pouring, the front vibrator is arranged at the bottom row of steel bars and the concrete slope foot, and the rear vibrator is arranged at the concrete unloading point. The bottom plate is vibrated vertically, and the distance between the vibration points is 300-400mm. During the concrete pouring process, the vibration should be carried out in accordance with the principle of fast insertion and slow withdrawal, and the vibrator is slowly pulled up and down to make the vibration dense. After the concrete is poured, it is leveled with a long scraper according to the elevation, and rubbed and compacted with a wooden trowel. Before the final setting, it is pressed with a wooden trowel to close the shrinkage cracks, and then covered with thermal insulation material. The thickness of the thermal insulation material is determined according to the temperature difference of the points on the surface of the large volume of concrete.

[0013] In the step 6), the concrete of the arch walls on both sides are poured at the same time, and the concrete is poured symmetrically in layers and sections. After each layer is vibrated and compacted, a new layer of concrete is covered. The upper layer of concrete must be poured before the lower layer of concrete begins to set. The interval between the upper and lower layers of pouring shall not exceed 1.5 hours. The arch wall concrete is poured in at least three layers, and the concrete on both sides of the deformation joint is poured symmetrically;

[0014] The upper part of the arch wall is vibrated with a vibrating rod, and the lower part is vibrated with a flat vibrator, and a special person is assigned to cooperate with the knocking and shifting.

[0015] In the step 6), the concrete is transported by a ground pump.

[0016] The advantages and positive effects of the present invention are as follows: by using a full-height scaffold to support and fix the side wall shaped steel formwork and the middle plate wooden formwork, the length of a single construction section can be increased from more than ten meters to more than one hundred meters, the single advancement distance is long, the construction speed is fast, and segmented and zoned flow operations can be adopted, which can greatly shorten the construction period; the use of pumped concrete pouring can ensure that the concrete slump meets the requirements and the quality of concrete molding is guaranteed. At the same time, the present invention has no restrictions on the curvature and slope of the corridor, and can be applied to corridor compartment projects with large curvature and slope. And the use of side wall shaped steel formwork and full-height scaffold support can improve the geometric accuracy of the compartment structure, thereby improving the quality of the project. In addition, the full-height scaffold is easy to erect, safe and stable, and the utilization rate of steel formwork and wooden formwork is high, and the overall project benefit is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a construction flow chart of the present invention;

[0018] Figure 2 It is the arch wall template diagram in the present invention;

[0019] Figure 3 It is a structural diagram of the upper shaped steel formwork of the right arch wall formwork in the present invention;

[0020] Figure 4 for Figure 3 Right view of;

[0021] Figure 5 It is a structural diagram of the middle shaped steel formwork of the right arch wall formwork in the present invention;

[0022] Figure 6 It is a structural diagram of the lower shaped steel formwork of the right arch wall formwork in the present invention;

[0023] Figure 7 It is a schematic diagram of step 4) of the present invention;

[0024] Figure 8 It is a schematic diagram of step 2) of the present invention;

[0025] Fig. 9 This is a schematic diagram of step 6) of the present invention.

[0026] In the figure: 1. bottom plate; 1-1. limiting groove; 2. arch wall; 3. middle plate; 4. scaffolding; 4-1. sweeping rod; 4-2. ground anchor steel bar; 4-3. center pole; 4-4. side adjustable bracket; 4-5. upper adjustable bracket; 4-6. cross bar; 4-7. diagonal bar; 5. arch wall formwork; 5-1. fixed foot; 5-2. rib; 5-3. circumferential back rib; 5-4. longitudinal back rib; 6. middle plate bottom formwork. DETAILED DESCRIPTION

[0027] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings:

[0028] See also Figures 1 to 9 A method for constructing a long-distance arched reinforced concrete compartment structure in a shield tunnel corridor section adopts the following steps:

[0029] 1) Tie the reinforcement of the bottom plate 1 and the arch wall 2.

[0030] 2) Pouring of concrete for base plate 1.

[0031] In this embodiment, a limiting groove 1 - 1 extending in the longitudinal direction is arranged in the center of the bottom plate 1 in the transverse direction, so as to limit the left and right positions of the scaffold 4 and stabilize the scaffold.

[0032] In this embodiment, the bottom plate concrete is poured at one time. According to the actual situation of the slope naturally formed during pumping and pouring, the front vibrator is arranged at the bottom row of steel bars and the concrete slope foot to ensure the compaction of the lower concrete, and the rear vibrator is arranged at the concrete unloading point to solve the compaction of the upper concrete. The bottom plate vibration adopts vertical vibration, and the distance between the vibration points is 300-400mm. During the concrete pouring process. The principle of fast insertion and slow withdrawal should be adopted for vibration, and the vibrator rod should be slightly pulled up and down to make the vibration compact.

[0033] After pouring concrete, it must be handled carefully. Use a long scraper to scrape it level according to the elevation, and use a wooden trowel to rub and compact it. Before final setting, use a wooden trowel to press it smooth to close the shrinkage cracks, and then cover it with insulation material. The thickness of the insulation material is determined according to the temperature difference between the points on the surface of the large volume of concrete.

[0034] 3) The arch wall formwork 5 is installed. The arch wall formwork 5 adopts a circumferentially spliced ​​standardized steel formwork.

[0035] In this embodiment, the back of the arch wall formwork 5 is provided with a rib 5-2 extending longitudinally along the pipe gallery. The rib 5-2 is made of Φ48*3.0mm steel pipe, with three ribs on each side. It is recommended to provide ribs 5-2 on the joints of the arch wall formwork 5 to improve the joint strength of the arch wall formwork 5. The standard steel formwork is processed and formed by the manufacturer. Before processing, a drawing is drawn according to the size of the arch wall, and the standard steel formwork is numbered according to the part. The single-sided arch wall formwork is divided into three pieces, with a length of 600mm. See Figures 3 to 6 Each steel formwork has 7 connection holes in the circumferential direction and 4 connection holes in the longitudinal direction. The steel formwork is connected by bolts, which has a simple structure and reliable connection. A fixed foot 5-1 extending 5cm outward is set at the bottom of the lower steel formwork. The upper steel formwork has no flat extension and a 10mm1 / 4 arc is set at the top. Each steel formwork has a circumferential back rib 5-3 and two longitudinal back ribs 5-4 in the middle, and the back rib height is 50mm.

[0036] 4) A full-floor scaffolding 4 is set up on the base plate 1, and the scaffolding 4 is used to support the arch wall formwork 5. A middle plate bottom formwork 6 is laid on the scaffolding 4, and the middle plate bottom formwork 6 adopts a wooden formwork.

[0037] The template for the compartment structure is supported by a steel pipe scaffold. In this embodiment, the scaffold is composed of vertical poles, horizontal poles, diagonal poles, adjustable brackets, etc. The steel pipes used in the above components are all Φ48*3.0mm, and the lengths of the steel pipes are 0.6m, 1.8m, 2.4m, 3.6m, and 4.2m. Each section is provided with 9 vertical poles and diagonal poles and 4 horizontal poles. The upper adjustable bracket is of model KTC-60, and the side adjustable bracket is of model KTZ-60. The scissor brace is of Φ48×3.0mm ordinary steel pipe, and the spacing along the pipe gallery direction is 0.9m. The scaffold 4 is provided with a central vertical pole 4-3, and the bottom of the central vertical pole 4-3 is fixed in the limiting groove 1-1 of the bottom plate.

[0038] The main ribs under the middle plate bottom mold are made of 100*100mm square wood, located on the upper adjustable brackets 4-5 of the scaffolding, and arranged horizontally along the corridor; the secondary ribs are made of 100*50mm square wood and arranged on the main ribs along the longitudinal length of the corridor, with a spacing of 300mm.

[0039] The side adjustable bracket 4-4 of the scaffold is used to support the arch wall formwork rib 5-2, and the side adjustable bracket 4-4 is connected to the scaffold cross bar 4-6 or the diagonal bar 4-7.

[0040] The sweeping rod 4-1 of the scaffolding is used to press and fix the fixed foot 5-1 of the arch wall formwork. The sweeping rod 4-1 of the scaffolding is fixed to the bottom plate 1 by using the anchor steel bar 4-2. The anchor steel bar 4-2 is C18@600mm and a lock nut is provided on the anchor steel bar 4-2.

[0041] 5) Binding of steel bars of middle plate 3;

[0042] 6) Cast the arch wall 2 and the middle plate 3.

[0043] The bottom plate, middle plate and arch wall are sealed with wooden formwork at the ends of the construction section and fixed with brackets at the inclined top to ensure that there is no leakage when pouring concrete.

[0044] In this embodiment, the concrete of the arch wall is poured symmetrically in layers and sections. After each layer is vibrated and compacted, a new layer of concrete is covered. The upper layer of concrete must be poured before the lower layer of concrete begins to set. The interval between the upper and lower layers must not exceed 1.5 hours. The arch wall concrete is poured in at least three layers, and the concrete on both sides of the expansion joint should also be poured symmetrically to prevent the arch wall formwork from being damaged by eccentric pressure due to excessive concrete height difference.

[0045] In addition to following the general principles, the following points should be noted when pouring the arch wall concrete: The arch walls on both sides are poured at the same time, and the height difference should not be too large to prevent the arch wall from being biased. During the pouring process, the steel bars should not be moved at will, and the thickness of the steel bar protective layer should be checked frequently. The work surface is equipped with 6 vibrators, 2 of which are spare. Since the arch wall is constructed with curved steel formwork, a large number of bubbles in the concrete cannot be discharged, so a large number of honeycombs will appear on the surface of the molded concrete. Therefore, the vibration intensity of the arch wall concrete must be increased to discharge as many bubbles as possible during the vibration process to improve the apparent quality of the arch wall concrete. The upper half of the arch wall is vibrated with a vibrating rod, and the lower half is vibrated with a flat vibrator, and a special person is assigned to cooperate with the knocking and shifting.

[0046] The concrete for the compartments in the corridor is C30 concrete, which is poured in two steps: pouring the invert concrete first, and then pouring the side wall and middle plate concrete. The concrete is transported by a ground pump, which can continuously transport the concrete in the pump pipe horizontally and vertically. The pump pipe is 3 meters long and connected by pipe clamps.

[0047] Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments, which are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can make many forms without departing from the scope of protection of the present invention and the claims, all of which fall within the scope of protection of the present invention.

Claims

1. A method for constructing a long-distance arched reinforced concrete compartment structure in a shield tunnel section, characterized in that: Use the following steps: 1) Binding of reinforcements for the bottom plate and arch wall; 2) pouring of base slab concrete; 3) Installation of arch wall formwork, which uses circumferentially spliced ​​shaped steel formwork; 4) Set up a full-floor scaffolding on the base plate, use the scaffolding to support the arch wall formwork, and lay the middle plate bottom formwork on the scaffolding; 5) Middle plate reinforcement binding; 6) Cast the arch wall and middle plate.

2. The method for constructing a long-distance arched reinforced concrete compartment structure in a shield tunnel section according to claim 1 is characterized in that: In the step 2), a limiting groove extending longitudinally is arranged in the center of the bottom plate; in the step 4), the scaffold is provided with an intermediate vertical pole, and the bottom of the intermediate vertical pole is fixed in the limiting groove of the bottom plate.

3. The method for constructing a long-distance arched reinforced concrete compartment structure in a shield tunnel corridor according to claim 1 is characterized in that: In the step 3), the arch wall formwork has a rib extending longitudinally along the pipe gallery on the back and a fixed foot extending outward on the bottom. In the step 4), the fixed foot of the arch wall formwork is fixed on the top by using a sweeping rod of a scaffolding, and the sweeping rod of the scaffolding is fixed to the base plate by using anchor steel bars; the rib of the arch wall formwork is supported by an adjustable side bracket of the scaffolding, and the adjustable side bracket is connected to a horizontal bar or an inclined bar.

4. The method for constructing a long-distance arched reinforced concrete compartment structure in a shield tunnel section according to claim 1 is characterized in that: In the step 3), a 10 mm 1 / 4 arc is provided on the upper end of the arch wall template.

5. The method for constructing a long-distance arched reinforced concrete compartment structure in a shield tunnel section according to claim 1 is characterized in that: In the step 3), a circumferential back rib is arranged in the middle of each shaped steel template, and two back ribs are arranged longitudinally.

6. The method for constructing a long-distance arched reinforced concrete compartment structure in a shield tunnel section according to claim 1 is characterized in that: In the step 3), the shaped steel formworks constituting the arch wall formworks are connected by bolts.

7. The method for constructing a long-distance arched reinforced concrete compartment structure in a shield tunnel corridor according to claim 3 is characterized in that: In the step 3), ribs are arranged on the joints of the arch wall formwork.

8. The method for constructing a long-distance arched reinforced concrete compartment structure in a shield tunnel section according to claim 1 is characterized in that: In the step 2), the bottom plate concrete is poured at one time. According to the actual situation of the slope naturally formed during pumping and pouring, the front vibrator is arranged at the bottom row of steel bars and the concrete slope foot, and the rear vibrator is arranged at the concrete unloading point. The bottom plate is vibrated vertically, and the distance between the vibration points is 300-400mm. During the concrete pouring process, the vibration should be fast inserted and slow pulled out, and the vibrator is slowly pulled up and down to make the vibration dense; After the concrete is poured, use a long scraper to level it according to the elevation, and use a wooden trowel to rub and compact it. Before the final setting, use a wooden trowel to press it to close the shrinkage cracks, and then cover it with insulation material. The thickness of the insulation material is determined according to the temperature difference between the points on the surface of the large volume of concrete.

9. The method for constructing a long-distance arched reinforced concrete compartment structure in a shield tunnel corridor according to claim 1 is characterized in that: In the step 6), the concrete of the arch walls on both sides are poured at the same time, and the concrete is poured symmetrically in layers and sections. After each layer is vibrated and compacted, a new layer of concrete is covered. The upper layer of concrete must be poured before the lower layer of concrete begins to set. The interval between the upper and lower layers of pouring shall not exceed 1.5 hours. The arch wall concrete is poured in at least three layers, and the concrete on both sides of the deformation joint is poured symmetrically; The upper part of the arch wall is vibrated with a vibrating rod, and the lower part is vibrated with a flat vibrator, and a special person is assigned to cooperate with the knocking and shifting.

10. The method for constructing a long-distance arched reinforced concrete compartment structure in a shield tunnel section according to claim 1, characterized in that: In the step 6), the concrete is transported by a ground pump.

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