An ultra-deep and large-span circular water pump house roof support and construction method thereof

Abstract

The present invention relates to the field of water intake facilities during the construction period of a waterworks or a pump house, and in particular to an ultra-deep and large-span circular water intake pump house roof support and a construction method thereof. The ultra-deep and large-span circular water intake pump house roof support of the present invention includes columns, beams, Bailey beams and scaffolding, and creatively adopts a cast-in-place support method of steel pipe columns + Bailey beams + fastener-type scaffolding, achieving the goal of first installing pump house equipment and then constructing the pump house roof, completing the rapid construction of the ultra-deep and large-span circular water intake pump house roof, ensuring the quality and construction period of the pump house roof construction, successfully solving the construction difficulties under the premise of pump house equipment installation, and maximizing the parallel operation and construction period optimization, which has a significant effect in process optimization, cost saving and progress control.

Description

Technical Field

[0001] The invention relates to the field of water intake facilities during the construction period of a waterworks or a water pump house, and in particular to an ultra-deep and large-span circular water intake pump house roof support and a construction method thereof. Background Art

[0002] The water intake pump house is also called the water source pump house, the first-level pump house, which is a surface water intake pump house that takes water from the water source and sends it to the water purification structure, or directly sends water to the user. The construction of the water intake pump house is a very important link in the construction of water conservancy projects. It can be built together with the water collection well, the water outlet gate well, etc., or it can be built separately. Due to the large changes in the water level of the water source and the limitation of the suction range of the water pump, the pump house is buried at a large depth. It is often built into a semi-underground or underground structure with a high cost. In order to reduce the area of ​​the pump house, the valves, check valves, flow meters, etc. on the water pump pressure pipe are mostly arranged in a dedicated well outside the pump house, and vertical water pumps are mostly used. The construction requirements of the water intake pump house are very high. It is often built in a deeper terrain, because this can ensure that the water pump can take water during the low water level and the water intake pump house will not be submerged during the flood level.

[0003] The construction of the roof of the water intake pump house is an important part of the construction of a new water plant, and is directly related to the durability and construction period of the water intake pump house structure of the water plant. The water intake pump house is generally divided into two parts: the well shaft under the ground level and the main frame structure on the ground level. The roof of the water intake pump house generally adopts the construction method of a ground-type steel pipe scaffolding of no more than 50m. The roof of the water intake pump house must be constructed after the installation of the water pump and other equipment at the bottom of the water intake pump house. The ground-type steel pipe scaffolding faces the problem of no ground support for rooting and the equipment pipes cannot bear the weight of the bracket. Therefore, how to take effective measures to ensure the quality of the construction of the roof of the water intake pump house, and to achieve the protection of water intake equipment and facilities and the owner's early completion is a research topic worthy of exploration. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides an ultra-deep and large-span circular water intake pump house roof support and a construction method thereof, which creatively adopts a cast-in-place support method of steel pipe columns + Bailey beams + fastener-type scaffolding, thereby achieving the goal of first installing the pump house equipment and then constructing the pump house roof, completing the rapid construction of the ultra-deep and large-span circular water intake pump house roof, ensuring the quality and construction period of the pump house roof construction, successfully solving the construction difficulties under the premise of pump house equipment installation, realizing parallel operation and construction period optimization to the maximum extent, and playing a significant role in process optimization, cost saving and progress control.

[0005] The ultra-deep and large-span circular water pump house roof support of the present invention comprises columns, cross beams, Bailey beams and scaffolding; the columns are configured in sections according to the required length, and both ends of each column section are sealed with steel plates of the same size; the cross beams are arranged on the tops of the columns, and the cross beams are anchored to the columns; the Bailey beams are arranged on the cross beams, and the Bailey beams are formed by assembling a number of single-row and single-layer Bailey sheets; the Bailey beams are fully covered with bamboo plywood, and distribution beams are arranged on the bamboo plywood and the Bailey beams; the scaffolding is arranged on the distribution beams.

[0006] Among them, the scaffolding includes full-height brackets, scissors braces, main ribs and secondary ribs; the full-height brackets are arranged on the distribution beams, and the scissors braces are arranged between the full-height brackets; the main ribs are made of steel pipes; and the secondary ribs are made of square wood.

[0007] A pre-buried steel plate is buried at a corresponding position of the bottom plate of the water intake pump room shaft. The pre-buried steel plate is in close contact with the bottom of the column. The provision of the pre-buried steel plate makes the column stronger, more solid and stable, and safer and more reliable to use.

[0008] The columns are connected by channel steel, which is beneficial for the columns to be stronger, more firm and stable, and safer and more reliable to use.

[0009] The Bailey beam is laterally connected via a flower stand, and the arrangement of the flower stand is beneficial to enhancing the stability of the Bailey beam and improving the overall force-bearing effect.

[0010] The bamboo plywood is connected with each other by flat connection, and the bamboo plywood and Bailey beam are anchored by U-shaped steel bars. The flat connection is convenient for erecting the upper scaffolding, and the bottom of the scaffolding is more stable and firm; the bamboo plywood and Bailey beam are anchored by U-shaped steel bars, which is convenient for limiting and reinforcing the bamboo plywood to prevent movement, and the installation is more convenient, the connection is more firm and stable, and the use is safer and more reliable.

[0011] An I-beam is provided on the inner wall of the wellbore of the water intake pump house. The I-beam is arranged in sections. The arrangement of the I-beam makes the installation of the column more convenient, more accurate and more efficient, and can effectively prevent the beam from falling when the Bailey beam is hoisted.

[0012] As a preferred solution for the roof support of an ultra-deep and large-span circular water intake pump house, the distribution beam is made of I-beam. The distribution beam made of I-beam can be easily manufactured using on-site materials, which is more cost-effective and has more significant economic benefits.

[0013] As the preferred solution for the roof support of the ultra-deep and large-span circular water intake pump house, the main frame and roof of the water intake pump house are cast on site in sections according to the height direction of the scaffolding, which is conducive to reducing the workload of scaffolding installation and disassembly, speeding up construction, shortening construction period, and reducing construction safety risks.

[0014] The cast-in-place construction method of the ultra-deep and large-span circular water pump house roof support of the present invention is carried out according to the following steps:

[0015] (1) Construction preparation: Specifically, it includes the preparation of construction materials and construction personnel, and the clarification of the location and size of the equipment and facilities at the bottom of the water intake pump room, providing basic data for the layout of large-diameter steel pipes;

[0016] (2) Foundation construction: Pre-embed steel plates at the corresponding positions of the wellbore bottom plate of the water intake pump room, and carry out corresponding reinforcement treatment on the pre-embedded steel plates. The pre-embedded steel plates under the steel pipe columns must be compacted;

[0017] (3) Install steel pipe columns and beams:

[0018] Process steel pipe columns and configure them in sections according to the required length. Use steel plates of the same size to seal the ends of each section. When docking, just weld the docking steel plates.

[0019] The processed φ630×10mm steel pipe columns are installed by crane, and the direction is controlled by manual rope pulling. Before installation and fixing, plumb bob and ruler are used to calibrate the verticality. At the same time, the bottom steel plate of the column is closely attached to the pre-buried steel plate of the foundation, and the columns are connected with [20 channel steel;

[0020] Without setting up a sand box, 4 I40 I-beams are placed horizontally on the top steel plate of the spiral pipe. 4 I40 I-beams with a length of 4m are also placed on the wellbore wall of the water intake pump room, avoiding the main structural column (KZ1 column);

[0021] Lift the beam, then weld two 60cm long channel steels on both sides of each sand box at the bottom of the beam, and use tie rods to anchor the beam and steel cylinder column to prevent the beam from falling when the Bailey beam is hoisted;

[0022] (4) Bailey beam hoisting: Use a single-row, single-layer reinforced Bailey sheet and hoist the connected Bailey sheets into place in the order of the middle first and then the two sides;

[0023] Bailey beams are arranged throughout the length, with a spacing of 45cm, avoiding structural columns, and the maximum spacing is 1.054m. The Bailey beams are connected horizontally into a whole using flower racks. Five Bailey beams are evenly distributed at a spacing of 20cm at the bottom of the beam, and 90cm at the rest. [20 channel steel is used for vertical reinforcement at the Bailey plate support points;

[0024] After the Bailey beam is hoisted, it is inspected and numbered in detail. The preloading of the Bailey beam is carried out after the bamboo plywood + I18 full-length I-beam are fully laid on it. Sandbags are used for preloading. The preloading tonnage reaches 1.3 times the total weight of the beam. Preloading settlement observation is carried out to determine the construction pre-camber value of each set of Bailey beams.

[0025] (5) Laying protective bamboo plywood:

[0026] After the Bailey beam is installed, high-strength bamboo plywood is fully paved. The bamboo plywood is flat-jointed without overlap to facilitate the erection of the upper scaffolding. The bamboo plywood is fixed to the Bailey beam using U-shaped steel bar anchoring. At the same time, the bamboo plywood is limited and reinforced according to the 16 structural columns evenly distributed on the wellbore of the water intake pump house to prevent movement.

[0027] (6) Scaffolding erection:

[0028] Lay distribution beams on Bailey beams + bamboo plywood as support points for steel pipe scaffolding poles;

[0029] A steel pipe full-floor bracket is set up on the distribution beam, with a vertical pole spacing of 90*90cm, 2 columns are added under the beam, and the horizontal pole step distance is 1.2m. The longitudinal / horizontal / vertical scissor braces are arranged according to the regulations. The bottom of the Φ48×2.8mm steel pipe is connected to the I-beam and Φ16 steel bars are welded on the I-beam to fix the vertical poles;

[0030] The main ribs are made of double-jointed Φ48 steel pipes, and the secondary ribs are made of 5*10cm square wood with a spacing of 15cm; the bottom formwork is 1.5cm bamboo plywood; the main load-bearing 1600mm thick well-shaped beam of the roof is densely arranged with 2 vertical poles at the bottom, with a vertical pole spacing of 40cm in the beam span direction and 30cm in the vertical beam span direction; the 180mm rear roof vertical poles are arranged at a spacing of 90×90cm;

[0031] The steel pipe scaffolding is rigidly connected to the frame column at 5m / track. The cylinder and frame column are pre-buried during concrete construction. Two 20 steel bars are welded to the 20mm thick steel plate; they are welded and anchored into the concrete 1m with the main reinforcement to prevent the steel pipe from tipping over in the middle; two 20 channel steels are used to raise the Bailey beam and the cylinder to prevent the Bailey truss from deflecting and crushing the maintenance platform at the elevation of 285.3m;

[0032] (7) Construction of water pump house roof:

[0033] The columns, ring beams, crane beams and corbels of the main frame structure are cast in sections according to the height direction of the steel pipe scaffolding, and the casting height is controlled at 6m;

[0034] After the columns are poured to the bottom of the roof, the roof is poured after the strength meets the requirements. The pouring order is first the cross beam, then the roof, and pouring evenly from the middle to the surrounding areas;

[0035] (8) Bracket removal:

[0036] When supporting and dismantling formwork, a reliable foothold should be set up for working at heights above 2 meters, and corresponding safety protection measures should be taken. The order of dismantling formwork should follow the principle of supporting first and then dismantling, and dismantling the latter support first, from top to bottom.

[0037] Among them, the beam is hoisted by artificial wind cable and crane, and the direction is controlled during the hoisting process. After the beam is hoisted, the elevation and plane position of the top of the beam are checked again to ensure that they are level.

[0038] Before the Bailey plates are hoisted, the Bailey plates are assembled on the ground according to the designed number of plates, and connected in groups. The positions of the Bailey plates in each group are marked with paint, and then hoisted with a 50T crane.

[0039] The four stress points of the hoisted Bailey plate are respectively the top of the shaft wall + steel pipe column cross beam + steel pipe column cross beam + shaft wall top.

[0040] The bottom of the flower rack beam is 20cm, and the rest of the beam is 90cm.

[0041] The distribution beam is a full-length I18a I-beam, which is arranged at the Bailey beam node with a spacing of 90 cm, and an I40 I-beam is used at the elevator shaft position.

[0042] For the removal of the support, a targeted safety technical briefing shall be conducted before the formwork is removed, and records shall be kept, and both parties shall sign the briefing. Before the formwork is removed, the formwork removal approval procedures must be completed, and it can only be removed after the approval and signature of the technical person in charge and the supervisor; before the formwork is removed, there must be a concrete strength test report or a rebound test, and the formwork can only be removed after the strength reaches the specified requirements.

[0043] During the construction and pouring of the water pump house roof, there shall be no leakage of slurry from the formwork. After the formwork is removed, the reinforced concrete components shall not have exposed reinforcement, rotten roots at the feet, or honeycombed surface on the concrete surface.

[0044] Compared with the prior art, the characteristics and beneficial effects of the present invention are:

[0045] The columns of the present invention are configured in sections according to the required length, and both ends of each section of the column are capped with steel plates of the same size; the crossbeam is arranged on the top of the column, and the crossbeam is anchored to the column; the Bailey beam is arranged on the crossbeam, and the Bailey beam is formed by assembling a plurality of single-row single-layer Bailey sheets; the Bailey beam is fully covered with bamboo plywood, and distribution beams are arranged on the bamboo plywood and the Bailey beam; the scaffolding is arranged on the distribution beam; the scaffolding includes a full-height bracket, a scissors brace, a main rib and a secondary rib; the full-height bracket is arranged on the distribution beam, and a scissors brace is arranged between the full-height brackets; the main rib It is made of steel pipe; the secondary ribs are made of square wood; a pre-buried steel plate is buried at the corresponding position of the bottom plate of the water pump room shaft, and the pre-buried steel plate is closely attached to the bottom of the column; the columns are connected by channel steel; the Bailey beam is horizontally connected through the flower rack; the bamboo plywood is connected by flat connection, and the bamboo plywood and the Bailey beam are anchored by U-shaped steel bars; I-beams are provided on the inner wall of the water pump room shaft, and the I-beams are arranged in sections. The present invention can be used for the roof construction of ultra-deep and large-span circular water pump rooms, and has a novel and reasonable structure, convenient assembly and disassembly, fast construction speed, and is safe and stable.

[0046] The cast-in-place construction method of the ultra-deep large-span circular water intake pump house support of the present invention utilizes large-span steel pipe columns, I-beams, Bailey beams and steel pipe scaffolding to form a support system, and the Bailey beams are supported by circular wellbore and large-diameter steel pipes, thereby realizing the early installation of all water intake facilities and equipment in the wellbore. The full paving of high-strength bamboo plywood better solves the safety protection problem of the ultra-deep wellbore.

[0047] Compared with the traditional ground-type steel pipe scaffolding construction method, the ultra-deep and large-span circular water pump house roof support cast-in-place construction method of the present invention has the following advantages:

[0048] (1) The ultra-deep and large-span shaft section support adopts steel pipe columns + Bailey beam supports. The steel pipe columns fully consider the location of the bottom of the pump room, and the reasonableness of the structural stress. The installation of steel pipe columns increases the rigidity, strength and stability of the structural stress, and solves the rooting of the support and the problem of failure to calculate the stress deflection of the large-span Bailey beam. The requirements for installing water intake equipment and facilities in advance are effectively met, and the safety control risks are effectively reduced.

[0049] (2) The main frame of the water pump house roof is constructed with Bailey beams covered with high-strength bamboo plywood + steel pipe scaffolding to solve the problems of large-span safety protection and roof cross-beam support.

[0050] (3) The cast-in-place construction of the scaffolding is done by using steel pipe columns + Bailey beams + bamboo plywood + steel pipe scaffolding, which reduces the workload and safety risks of scaffolding installation and disassembly.

[0051] In addition, the ultra-deep and large-span circular water pump house support cast-in-place construction method of the present invention also has safety benefits, progress benefits and economic benefits:

[0052] The present invention adopts a ground-type steel pipe scaffolding not exceeding 50m, and requires the roof to be constructed before the installation of water pump room equipment and facilities. The scaffolding height is 42m, and the erection and dismantling of the bracket is cumbersome and time-consuming. It is located 28 meters below the ground, and the safety protection risk is high. The use of a steel pipe column combined bracket method can reduce the above safety risks.

[0053] Compared with the construction of ground-based steel pipe scaffolding not exceeding 50m, it solves the roof construction of ultra-deep and large-span circular water pump house under the premise of installing equipment. It also solves the problems of large construction workload and long construction time for the construction of ground-based scaffolding. The cast-in-place construction method of the roof support of ultra-deep and large-span circular water pump house has the advantages of short construction period, fast construction speed, simple process and reduced labor input, so the construction period is shortened accordingly.

[0054] Taking the cast-in-place construction of the roof support of the water intake pump house of Pu'an Water Plant built on the bank of Jinsha River in Xuzhou District, Yibin City as an example, the well shaft has a diameter of 28m, a span of 28m, a main frame of 14m on the ground, and 16 KZ1 concrete columns, a steel pipe column combined support was used to achieve the cast-in-place support of the large-span roof of the ultra-deep and large-span circular water intake pump house on the premise of installing equipment. Compared with the construction method of ground-based steel pipe scaffolding not exceeding 50m, the investment saved 240,000 yuan. The specific economic benefit comparison is shown in the table below.

[0055] Table 1 Economic Benefit Comparison

[0056]

[0057] In summary, the present invention adopts a steel pipe column combined bracket construction process for the roof construction of a large-span circular water intake pump house, which has the advantages of fast construction speed and low safety risk. It not only ensures the construction period target, but also meets the construction force of the 1600mm thick roof cross beam, and at the same time meets the requirements of early installation of facilities and equipment. It comprehensively considers the construction progress and social benefits, avoids construction risks, ensures construction safety, and achieves good social and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 It is a process flow chart of the cast-in-place construction method of the ultra-deep and large-span circular water intake pump house support of the present invention;

[0059] Figure 2 It is an overall stereogram of the ultra-deep and large-span circular water intake pump house roof support of the present invention;

[0060] Among them: 1: column 1; 2: crossbeam; 3: Bailey beam; 4: scaffolding; 5: bamboo plywood; 6: distribution beam; 7: full-floor bracket; 8: scissors brace; 9: main rib; 10: secondary rib; 11: embedded steel plate; 12: channel steel; 13: flower stand; 14: U-shaped steel bar; 15: I-beam. DETAILED DESCRIPTION

[0061] This embodiment is illustrated by the Pu'an Water Plant Project in Yibin City, which was undertaken by China Railway No. 5 Engineering Group Co., Ltd. The roof construction of the water intake pump house with a well depth of 28.15m, a net well diameter of 28m, and a main roof frame height of 14m has been achieved. The protection of the equipment and facilities at the bottom of the pump house well has been achieved, and the construction process has accelerated the realization of the construction period goals and reduced the safety risks of high formwork supports, which has been unanimously praised by the owner, design and supervision units.

[0062] The materials used in this construction method are mainly steel pipes, Bailey beams, bamboo plywood, scaffolding steel pipes, I-beams and other materials.

[0063] Table 2 Main material configuration table

[0064]

[0065]

[0066] The configuration of construction machinery is mainly to meet the requirements of lifting, welding and other processes.

[0067] Table 3 Configuration of main construction machinery and equipment

[0068] Serial number Mechanical equipment name Specifications and models unit quantity Remark 1 crane 50t tower 2 2 Crane beam tower 1 3 Electric welding machine tower 6

[0069] Note: Machinery and equipment can be adjusted and increased or decreased according to site needs.

[0070] like Figure 2 As shown, an ultra-deep and large-span circular water pump house roof support of the present embodiment includes a column 1, a cross beam 2, a Bailey beam 3 and a scaffold 4; the column 1 is configured in sections according to the required length, and both ends of each section of the column 1 are capped with steel plates of the same size; the cross beam 2 is arranged on the top of the column 1, and the cross beam 2 is anchored to the column 1; the Bailey beam 3 is arranged on the cross beam 2, and the Bailey beam 3 is formed by assembling a plurality of single-row and single-layer Bailey sheets; the Bailey beam 3 is fully covered with bamboo plywood 5, and distribution beams 6 are arranged on the bamboo plywood 5 and the Bailey beam 3; the scaffold 4 is arranged on the distribution beam 6.

[0071] In one embodiment of the roof support of an ultra-deep and large-span circular water intake pump house, the scaffolding 4 includes a full-height support 7, a scissors brace 8, a main rib 9 and a secondary rib 10; the full-height support 7 is arranged on the distribution beam 6, and the scissors brace 8 is arranged between the full-height support 7; the main rib 9 is made of steel pipe; and the secondary rib 10 is made of square wood.

[0072] In one embodiment of the roof support of an ultra-deep and large-span circular water intake pump house, a pre-embedded steel plate 11 is buried at a corresponding position of the bottom plate of the water intake pump house shaft. The pre-embedded steel plate 11 is in close contact with the bottom of the column 1. The provision of the pre-embedded steel plate 11 facilitates the column 1 to be stronger, more solid and stable, and safer and more reliable to use.

[0073] In one embodiment of the ultra-deep and large-span circular water pump house roof support, the columns 1 are connected by channel steels 12, which is beneficial for the columns 1 to be stronger, more firm and stable, and safer and more reliable to use.

[0074] In one embodiment of the ultra-deep and large-span circular water pump house roof support, the Bailey beam 3 is laterally connected through a flower rack 13. The arrangement of the flower rack 13 is conducive to enhancing the stability of the Bailey beam 3 and improving the overall force effect.

[0075] In one embodiment of the roof support of an ultra-deep and large-span circular water intake pump house, the bamboo plywood sheets 5 are connected by a flat connection, and the bamboo plywood sheets 5 and the Bailey beam 3 are anchored by U-shaped steel bars 14. The flat connection facilitates the erection of the upper scaffolding 4, making the bottom of the scaffolding 4 more stable and firm; the bamboo plywood sheets 5 and the Bailey beam 3 are anchored by U-shaped steel bars 14 to facilitate the limiting and reinforcement of the bamboo plywood sheets to prevent movement, making installation more convenient, the connection more solid and stable, and the use safer and more reliable.

[0076] In one embodiment of the ultra-deep large-span circular water intake pump house roof support, an I-beam 15 is provided on the inner wall of the water intake pump house shaft, and the I-beam 15 is arranged in sections. The arrangement of the I-beam 15 facilitates the installation of the column 1 more conveniently, more accurately, and more efficiently, and can effectively prevent the crossbeam 2 from falling when the Bailey beam 3 is hoisted.

[0077] In one embodiment of the ultra-deep large-span circular water pump house roof support, the distribution beam 6 is made of I-beam 15. The distribution beam 6 made of I-beam 15 can be easily manufactured using on-site materials, which is more cost-effective and has more significant economic benefits.

[0078] In one embodiment of the ultra-deep and large-span circular water pump house roof support, the main frame and roof of the water pump house are cast on site in sections according to the height direction of the scaffolding 4, which is beneficial to reduce the installation and disassembly workload of the scaffolding 4, speed up the construction speed, shorten the construction period, and reduce the safety risks of the construction.

[0079] The columns 1 of this embodiment are configured in sections according to the required length, and both ends of each section of the column 1 are capped with steel plates of the same size; the crossbeam 2 is arranged on the top of the column 1, and the crossbeam 2 is anchored to the column 1; the Bailey beam 3 is arranged on the crossbeam 2, and the Bailey beam 3 is formed by assembling a number of single-row single-layer Bailey sheets; the Bailey beam 3 is fully covered with bamboo plywood 5, and distribution beams 6 are arranged on the bamboo plywood 5 and the Bailey beam 3; the scaffolding 4 is arranged on the distribution beam 6; the scaffolding 4 includes a full-chamber bracket 7, a scissors brace 8, a main rib 9 and a secondary rib 10; the full-chamber bracket 7 is arranged on the distribution beam 6, and the scissors brace 8 is arranged between the full-chamber brackets 7; the main rib 9 is made of steel pipe; the secondary rib 10 is made of square wood; a pre-buried steel plate 11 is buried in the corresponding position of the bottom plate of the wellbore of the water pump room, and the pre-buried steel plate 11 is closely attached to the bottom of the column 1; 1 is connected by channel steel 12; Bailey beam 3 is horizontally connected by flower rack 13; bamboo plywood 5 is connected by flat connection, and bamboo plywood 5 and Bailey beam 3 are anchored by U-shaped steel bar 14; I-beam 15 is provided on the inner wall of the wellbore of water intake pump room, and I-beam 15 is arranged in sections. When in use, firstly, embedded steel plate 11 is buried in the corresponding position of the bottom plate of the wellbore of water intake pump room, and the embedded steel plate 11 is reinforced with corresponding steel bars, and the embedded steel plate 11 is compacted and compacted, and then the column 1 and the crossbeam 2 are installed, and then Bailey beam 3 is installed and bamboo plywood 5 is laid on Bailey beam 3, and then distribution beam 6 is laid on Bailey beam 3 and bamboo plywood 5 as the support point of scaffolding 4 uprights, and then scaffolding 4 is erected on distribution beam 6, and finally the main frame and roof are cast in sections on site. The invention can be used for the roof construction of an ultra-deep and large-span circular water intake pump house, has a novel and reasonable structure, is convenient to assemble and disassemble, has a fast construction speed, and is safe and stable.

[0080] The process flow of the cast-in-place construction method of the ultra-deep and large-span circular water pump house support in this embodiment is as follows: Figure 1 As shown, follow these steps:

[0081] (1) Construction preparation:

[0082] Arrange the delivery of raw materials such as steel sections, steel pipes, Bailey beams, steel pipes, etc. according to the number of projects;

[0083] Be familiar with the construction process and quality control standards, installation operating procedures, and conduct safety training and construction operating procedures training;

[0084] Carefully compare the location and size of the equipment and facilities at the bottom of the water intake pump house to provide basic data for the layout of large-diameter steel pipes;

[0085] (2) Foundation construction

[0086] The ultra-deep and large-span circular water intake pump house support method requires burying steel plates at the corresponding positions of the water intake pump house shaft bottom plate, and carrying out corresponding steel reinforcement treatment on the embedded steel plate parts. The steel pipe columns must be compacted tightly under the embedded steel plates.

[0087] (3) Install steel pipe columns and beams

[0088] The steel pipe columns are divided into sections according to the required length. The ends of each section are sealed with steel plates of the same size. When docking, the docking steel plates can be welded. The processed φ630×10mm steel pipe columns are installed by crane, and the direction is controlled by manual rope pulling. Before installation and fixing, plumb bob and ruler are used to correct the verticality. At the same time, the bottom steel plate of the column is closely attached to the pre-buried steel plate of the foundation. The columns are connected with [20 channel steel.

[0089] Without sand boxes, 4 I40 I-beams are placed horizontally on the top steel plate of the spiral tube. 4 I40 I-beams with a length of 4m are also placed on the shaft wall, avoiding the KZ1 column. The beam is hoisted by manual wind rope and crane. The direction is controlled during the hoisting process. After the beam is hoisted, the top elevation and plane position of the beam are checked again to ensure the level is consistent. Then, 2 60cm long channel steels are welded on both sides of each sand box at the bottom of the beam, and the beam and steel cylinder column are anchored with tie rods to prevent the beam from falling when the Bailey beam is hoisted.

[0090] (4) Bailey beam hoisting

[0091] The Bailey beam uses a single-row, single-layer reinforced (321-type) Bailey sheet. First, assemble the Bailey sheets on the ground according to the designed number of sheets and connect them in groups. Mark the position of each group of Bailey sheets with paint. Use a 50T crane to hoist the connected Bailey sheets into place in the order of the middle first and then the two sides.

[0092] The Bailey beam is arranged throughout the length with a spacing of 45cm. When encountering the main structural column (KZ1 column), it is reasonably avoided. The maximum spacing is 1.054m. In order to improve the overall force effect of the Bailey beam and strengthen the stability of the Bailey, the Bailey beam is connected horizontally with a flower rack. The bottom of the flower rack beam is 20cm, and the rest is 90cm. There are 5 Bailey beams at a spacing of 20cm at the bottom of the beam, and 90cm at the rest. [20 channel steel is used for vertical reinforcement at the Bailey plate support. The specific layout is as follows:

[0093] There are 4 stress points of Bailey plates, namely the top of the shaft wall + steel pipe column cross beam + steel pipe column cross beam + shaft wall top. After the Bailey beam is assembled, it is checked in detail and numbered. The preloading of the Bailey beam is carried out after the bamboo plywood + I18 full-length I-beam are fully laid on it. Sandbags are used for preloading. The preloading tonnage reaches 1.3 times the total weight of the beam. Preloading settlement observation is carried out to determine the construction pre-camber value of each set of Bailey beams.

[0094] (5) Laying protective bamboo plywood

[0095] After the Bailey beam is installed, high-strength bamboo plywood is fully paved. The bamboo plywood is connected flatly without overlapping, which is convenient for the erection of the upper scaffolding. U-shaped steel bar anchoring is used to fix the bamboo plywood to the Bailey beam. At the same time, the bamboo plywood is limited and reinforced according to the 16 structural columns evenly distributed on the wellbore of the water intake pump house to prevent movement.

[0096] (6) Scaffolding erection

[0097] Distribution beams are laid on Bailey beams + bamboo plywood as support points for steel pipe scaffolding poles. Distribution beams are I18a I-beams with a spacing of 90cm and are arranged on Bailey beam nodes (I40 I-beams are used at the elevator shaft).

[0098] A steel pipe full-span support is set up on the I18a I-beam distribution beam, with a vertical pole spacing of 90*90cm (two columns are added under the beam), a horizontal pole pitch of 1.2m, and longitudinal / horizontal / vertical scissors braces arranged according to regulations. The bottom of the Φ48×2.8mm steel pipe is connected to the I-beam, and Φ16 steel bars are welded on the I-beam to fix the vertical poles.

[0099] The main ribs are made of double-jointed Φ48 steel pipes, and the secondary ribs are made of 5*10cm square wood with a spacing of 15cm. The bottom formwork is 1.5cm bamboo plywood. The main load-bearing roof is a 1600mm thick well-shaped beam with two vertical poles arranged at the bottom. The vertical pole spacing in the beam span direction is 40cm, and 30cm in the vertical beam span direction. The 180mm rear roof vertical poles are arranged at a spacing of 90×90cm.

[0100] The steel pipe scaffolding is rigidly connected to the frame column at 5m / track. The cylinder and frame column are pre-buried during concrete construction. Two 20 steel bars are welded to the back of the 20mm thick steel plate. They are welded to the main reinforcement and anchored into the concrete 1m to prevent the steel pipe from tipping over in the middle. Two 20 channel steels are used to raise the Bailey beam and the cylinder to prevent the Bailey truss from deflecting and crushing the maintenance platform at the elevation of 285.3m.

[0101] (7) Construction of the roof of the water pump house

[0102] The columns, ring beams, crane beams and corbels of the main frame structure are cast in sections according to the height direction of the steel pipe scaffolding, and the casting height is controlled at about 6m.

[0103] After the columns are poured to the bottom of the roof, the roof is poured after the strength meets the requirements. The pouring order is first the cross beams, then the roof, and pouring evenly from the middle to the surrounding areas.

[0104] During the pouring of concrete, there must be no leakage or runaway of slurry from the formwork. After the formwork is removed, there must be no exposed reinforcement in the reinforced concrete components, no rotten roots at the feet, and no honeycombed and rough surfaces on the concrete surface.

[0105] (8) Bracket removal

[0106] Before removing the formwork, conduct targeted safety technical briefings, keep records, and have both parties sign the briefings. Before removing the formwork, the formwork removal approval procedures must be completed, and it can only be removed after approval and signature by the technical person in charge and the supervisor.

[0107] When supporting and dismantling the formwork, a reliable foothold should be set up for operations at heights above 2 meters, and corresponding safety protection measures should be taken. The order of dismantling the formwork should follow the principle of supporting first and then dismantling, and dismantling the last support first, from top to bottom.

[0108] Before removing the formwork, there must be a concrete strength test report or a rebound test, and the formwork can only be removed after the strength reaches the specified requirements.

[0109] This construction method requires strict quality control to ensure the quality of the project:

[0110] Personnel entering the site must undergo special safety training and, after passing the examination, be issued an access permit before they can carry out construction; personnel performing special operations must undergo professional training and obtain a certificate before they can take up their posts; new personnel entering the site during the intermediate process must undergo training and assessment before they can carry out their work.

[0111] Machinery and equipment entering the site must have a factory certificate, and special equipment must have a factory certificate and a test report from the relevant safety inspection unit; all equipment must be inspected and accepted by the supervisor and meet the requirements before they can enter the site for operation.

[0112] After the on-site quality inspector conducts self-inspection according to the inspection batch and passes the inspection, the on-site supervisor shall report to the on-site supervisor for acceptance. Only after the on-site supervisor passes the acceptance can the next process be carried out; if the on-site supervisor fails to pass the acceptance, the on-site quality inspector must urge the construction personnel to make rectifications, and after the rectifications pass, the on-site supervisor shall report to the on-site supervisor for acceptance. Only after the acceptance passes can the next process be carried out. Strictly control the installation quality of the bracket and model, and the bracket should be installed horizontally and vertically, with firm connections.

[0113] This construction method has strict safety measures to ensure construction safety:

[0114] The erection and dismantling of formwork scaffolding are carried out by professionals, and all personnel are certified.

[0115] Personnel who erect formwork supports must wear safety helmets, safety belts, and non-slip shoes. Before work, check whether the tools used are firm. Tools such as wrenches must be tied to the body with ropes or placed in tool bags to prevent them from falling and injuring people. When working, the mind must be focused to prevent nails from piercing the feet and slipping in the air. During the erection and dismantling of the formwork, full-time safety personnel will supervise the entire process and provide guidance according to special plans.

[0116] Steel pipes, fasteners, material quality and erection shall be inspected and accepted according to the prescribed inspection and acceptance form before use. The formwork support shall be inspected and maintained safely.

[0117] When there is a gale of level 6 or above or it is raining, the erection and removal of the formwork support should be stopped. Anti-slip measures should be taken when putting up the formwork after rain.

[0118] During the concrete pouring process, a dedicated person is assigned to observe the working status of the formwork support system. If the observer finds any abnormality, he should promptly report it to the construction manager, who should immediately notify the pouring personnel to suspend the work. In case of emergency, emergency measures should be taken to quickly evacuate personnel and reinforce the concrete. Work can only resume after the danger is eliminated and re-inspected.

[0119] The installation of temporary power lines on construction sites shall comply with the current industry standard "Technical Specifications for Temporary Power Safety at Construction Sites"

[0120] (JGJ46-2005) relevant regulations shall be implemented. The distribution box for on-site construction shall be in place.

[0121] When the formwork support is dismantled, fences and warning signs should be set up around the area, and dedicated personnel should be assigned to guard it. Non-operating personnel are strictly prohibited from entering.

[0122] Formwork removal measures:

[0123] ① The concrete strength should reach 100% when the bottom formwork and its support are removed.

[0124] ② Before removing the floor support, the concrete specimens cured under the same conditions must be tested. According to the design requirements, the formwork can only be removed after the concrete strength value reaches the specified requirements and is reported to the supervisor for approval.

[0125] ③Before removing the formwork, technical instructions should be given to the removal personnel and written procedures should be completed.

[0126] ④ The demolition work must be carried out step by step from top to bottom. It is strictly forbidden to carry out the work at the same time. The height difference of the segmented demolition should not be greater than two steps. For the formwork support with wall connectors, the connectors must be removed layer by layer along with the support. It is strictly forbidden to remove all or several steps of the connectors before removing the support.

[0127] ⑤ When dismantling the bottom formwork, each person should have enough working surface, and the formwork should be dismantled piece by piece. It should not be loosened, pried off, or pulled down in pieces.

[0128] ⑥ The removal of high-altitude formwork should be directed by a dedicated person and reliable safety measures should be taken. The work area should be marked below, and non-operating personnel are strictly prohibited from entering the work area. Operators should wear safety belts and are prohibited from standing on the horizontal tie rods of the formwork. The removed formwork should be lifted together and tied at multiple points, and it is not allowed to be thrown down randomly.

[0129] ⑦ A long crowbar should be used to remove the formwork, and the operator should stand on the side. It is strictly forbidden to operate on the same vertical plane, and no one is allowed to pass through the place where the formwork has fallen or fallen sideways.

[0130] ⑧ When encountering a gale of level 6 or above, outdoor high-altitude operations should be suspended. Anti-slip measures must be taken when working on shelves after rain.

[0131] This construction method also has environmental protection and energy-saving measures:

[0132] During the construction process, comprehensive environmental protection and water conservation measures should be taken, and environmental protection and water conservation facilities should be strictly constructed and completed at the same time as the main project to avoid future troubles. After completion, they should be restored in a timely manner to ensure that the environment where the project is located and the waters along the route are not polluted or damaged, protect the water resources environment, prevent soil erosion, and meet national environmental protection standards.

[0133] Night construction should be avoided as much as possible to avoid noise pollution to nearby villages.

[0134] After the project is completed, clean up the garbage on site in a timely manner and leave in a civilized manner.

Claims

1. An ultra-deep and large-span circular water pump house roof support, characterized in that It includes columns, beams, Bailey beams and scaffolding; the columns are configured in sections according to the required length, and both ends of each column section are sealed with steel plates of the same size; the beams are arranged on the tops of the columns, and the beams are anchored to the columns; the Bailey beams are arranged on the beams, and the Bailey beams are formed by assembling a number of single-row single-layer Bailey sheets; the Bailey beams are fully covered with bamboo plywood, and distribution beams are arranged on the bamboo plywood and the Bailey beams; the scaffolding is arranged on the distribution beams; The columns are connected by channel steels, and the Bailey beams are horizontally connected by flower racks; The scaffolding comprises a full-height bracket, a scissors brace, a main rib and a secondary rib; the full-height bracket is arranged on the distribution beam, and the scissors brace is arranged between the full-height brackets; the main rib is made of steel pipe; the secondary rib is made of square wood; The bamboo plywood is connected with each other by flat connection, and the bamboo plywood and Bailey beam are anchored by U-shaped steel bars. The flat connection is convenient for erecting the upper scaffolding, and the bottom of the scaffolding is more stable and firm; the bamboo plywood and Bailey beam are anchored by U-shaped steel bars, which is convenient for limiting and reinforcing the bamboo plywood to prevent movement, and the installation is more convenient, the connection is more firm and stable, and the use is safer and more reliable.

2. The ultra-deep and large-span circular water pump house roof support according to claim 1, characterized in that: A pre-buried steel plate is buried at a corresponding position of the bottom plate of the wellbore of the water intake pump house, and the pre-buried steel plate is in close contact with the bottom of the column; an I-beam is arranged on the inner wall of the wellbore, and the I-beam is arranged in sections.

3. The construction method of the ultra-deep and large-span circular water pump house roof support as claimed in claim 1, characterized in that: Follow these steps: (1) Construction preparation: Specifically, it includes the preparation of construction materials and construction personnel, clarifying the location and size of the equipment and facilities at the bottom of the water intake pump room, and providing basic data for the layout of large-diameter steel pipes; (2) Foundation construction: Pre-embed steel plates at the corresponding positions of the wellbore bottom plate of the water intake pump house, and carry out corresponding reinforcement treatment on the pre-embedded steel plates. The pre-embedded steel plates under the steel pipe columns must be compacted; (3) Install steel pipe columns and beams: Process steel pipe columns and configure them in sections according to the required length. Use steel plates of the same size to seal the ends of each section. When docking, just weld the docking steel plates. The processed φ630×10mm steel pipe columns are installed by crane, and the direction is controlled by manual rope pulling. Before installation and fixing, plumb bob and ruler are used to calibrate the verticality. At the same time, the bottom steel plate of the column is closely attached to the pre-buried steel plate of the foundation, and the columns are connected with [20 channel steel; Without setting up a sand box, 4 I40 I-beams are placed horizontally on the top steel plate of the spiral pipe. 4 I40 I-beams with a length of 4m are also placed on the wellbore wall of the water intake pump room, avoiding the KZ1 column. Lift the beam, then weld two 60cm long channel steels on both sides of each sand box at the bottom of the beam, and use tie rods to anchor the beam and steel cylinder column to prevent the beam from falling when the Bailey beam is hoisted; (4) Bailey beam hoisting: Use a single-row, single-layer reinforced Bailey sheet and hoist the connected Bailey sheets into place in the order of the middle first and then the two sides; Bailey beams are arranged throughout the length, with a spacing of 45cm, avoiding structural columns, and the maximum spacing is 1.054m. The Bailey beams are connected horizontally into a whole using flower racks. Five Bailey beams are evenly distributed at a spacing of 20cm at the bottom of the beam, and 90cm at the rest. [20 channel steel is used for vertical reinforcement at the Bailey plate support points; After the Bailey beam is hoisted, it is inspected and numbered in detail. The preloading of the Bailey beam is carried out after the bamboo plywood + I18 full-length I-beam are fully laid on it. Sandbags are used for preloading. The preloading tonnage reaches 1.3 times the total weight of the beam. Preloading settlement observation is carried out to determine the construction pre-camber value of each set of Bailey beams. (5) Laying protective bamboo plywood: After the Bailey beam is installed, high-strength bamboo plywood is fully paved. The bamboo plywood is flat-jointed without overlap to facilitate the erection of the upper scaffolding. The bamboo plywood is fixed to the Bailey beam using U-shaped steel bar anchoring. At the same time, the bamboo plywood is limited and reinforced according to the 16 structural columns evenly distributed on the wellbore of the water intake pump house to prevent movement. (6) Scaffolding erection: Lay distribution beams on Bailey beams + bamboo plywood as support points for steel pipe scaffolding poles; A steel pipe full-floor bracket is set up on the distribution beam, with a vertical pole spacing of 90*90cm, 2 columns are added under the beam, and the horizontal pole step distance is 1.2m. The longitudinal / horizontal / vertical scissor braces are arranged according to the regulations. The bottom of the Φ48×2.8mm steel pipe is connected to the I-beam and Φ16 steel bars are welded on the I-beam to fix the vertical poles; The main ribs are made of double-jointed Φ48 steel pipes, and the secondary ribs are made of 5*10cm square wood with a spacing of 15cm; the bottom formwork is 1.5cm bamboo plywood; the main load-bearing 1600mm thick well-shaped beam of the roof is densely arranged with 2 vertical poles at the bottom, with a vertical pole spacing of 40cm in the beam span direction and 30cm in the vertical beam span direction; the 180mm rear roof vertical poles are arranged at a spacing of 90×90cm; The steel pipe scaffolding is rigidly connected to the frame column at 5m / track. The cylinder and frame column are pre-buried during concrete construction. Two 20 steel bars are welded to the 20mm thick steel plate; they are welded and anchored into the concrete 1m with the main reinforcement to prevent the steel pipe from tipping over in the middle; two 20 channel steels are used to raise the Bailey beam and the cylinder to prevent the Bailey truss from deflecting and crushing the maintenance platform at the elevation of 285.3m; (7) Construction of water pump house roof: The columns, ring beams, crane beams and corbels of the main frame structure are cast in sections according to the height direction of the steel pipe scaffolding, and the casting height is controlled at 6m; After the columns are poured to the bottom of the roof, the roof is poured after the strength meets the requirements. The pouring order is first the cross beam, then the roof, and pouring evenly from the middle to the surrounding areas; (8) Bracket removal: When supporting and dismantling formwork, a reliable foothold should be set up for working at heights above 2 meters, and corresponding safety protection measures should be taken. The order of dismantling formwork should follow the principle of supporting first and then dismantling, and dismantling the latter support first, from top to bottom.

4. The construction method of the ultra-deep large-span circular water pump house roof support according to claim 3 is characterized in that The crossbeam is hoisted by artificial wind rope and crane. The direction is controlled during the hoisting process. After the crossbeam is hoisted, the elevation and plane position of the top of the crossbeam are checked again to ensure that they are level.

5. The construction method of the ultra-deep large-span circular water pump house roof support according to claim 3 is characterized in that Before the Bailey plates are hoisted, the Bailey plates are assembled on the ground according to the designed number of plates, and connected in groups. The positions of the Bailey plates in each group are marked with paint, and then hoisted with a 50T crane.

6. The construction method of the ultra-deep large-span circular water pump house roof support according to claim 3 is characterized in that The four stress points of the hoisted Bailey plate are respectively the top of the shaft wall + steel pipe column cross beam + steel pipe column cross beam + shaft wall top.

7. The construction method of the ultra-deep large-span circular water pump house roof support according to claim 3 is characterized in that The bottom of the flower rack beam is 20cm, and the rest of the beam is 90cm.

8. The construction method of the ultra-deep large-span circular water pump house roof support according to claim 3 is characterized in that The distribution beam is a full-length I18a I-beam, which is arranged at the Bailey beam node with a spacing of 90 cm, and an I40 I-beam is used at the elevator shaft position.

Images