Circular well wall precast segment construction method
By using a combined load-bearing structure of lifting rods, fixing rods, and diagonal support rods during the hoisting process, the problem of inconvenient hoisting of precast circular well segments in confined spaces was solved, achieving an efficient and low-cost construction method.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHINA 19TH METALLURGICAL CORP
- Filing Date
- 2023-06-15
- Publication Date
- 2026-05-19
AI Technical Summary
In existing technologies, the large size of hoisting equipment makes it inconvenient to hoist small precast components, resulting in high construction costs and time and labor costs. In particular, it is difficult to efficiently hoist precast segments of circular well walls in confined spaces.
The system employs a combined load-bearing structure consisting of a central fixed rod and a lower inclined support rod of the lifting device. The segments are locked in place by a fixed sleeve and steel pins, and then lifted using a mobile installation trolley. The segments are welded together with water-stop strips and connecting ribs. The lifting device is then removed for the next lifting step, until the segment installation of the circular well wall structure is completed.
It enables convenient and stable segment hoisting in confined spaces, improves construction efficiency, reduces construction costs, and expands the application areas of precast segments for circular well walls.
Smart Images
Figure CN116696355B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of underground construction methods, and in particular to a method for constructing precast tunnel segments for circular well walls. Background Technology
[0002] Currently, most construction machinery uses large hoisting equipment, making it inconvenient to lift small precast components. This limitation in hoisting methods leads to high construction costs. Furthermore, manual handling is time-consuming and labor-intensive. Existing small cranes require manual pushing to move forward and cannot be used for loading and transporting heavy objects. Therefore, optimizing the hoisting structure, especially the hoisting method for precast tunnel segments, is key to achieving a breakthrough in hoisting construction methods. Summary of the Invention
[0003] The technical problem to be solved by the present invention is to provide a method for constructing precast tunnel segments in circular well walls that is suitable for hoisting and transporting precast tunnel segments in a confined space, and has high construction efficiency and low construction cost.
[0004] The technical solution adopted by this invention to solve its technical problem is: a method for constructing precast tunnel segments for circular well walls, comprising the following steps: a) producing the tunnel segments required for construction: designing the shape and size of the tunnel segments according to the internal dimensions of the circular well wall structure, the geological conditions of the construction site, and the surrounding environmental factors, and prefabricating them in the factory; b) setting out the construction location, excavating the earthwork in layers, with the excavation diameter being 100-200mm longer than the internal diameter of the circular well wall structure, and starting the installation of the tunnel segments after excavating to the depth where the first section of the tunnel segment is to be installed; c) driving a mobile installation trolley to lift the tunnel segments, wherein the lifting method is as follows: the mobile installation trolley is equipped with a lifting device, the fixed rod in the middle of the lifting rod of the lifting device passes through the tunnel segment, and the tunnel segment is locked by a fixing sleeve and a steel pin. The lower fixing sleeve and diagonal support rod support the bottom of the segment. The segment is then fixed again by the fixing sleeve and steel pin. The segments are then assembled into a closed ring. Adjacent segments are connected by vertical grooves. Water-stop strips are installed between the segments and connected by welding with connecting ribs. After the segments are installed, they are removed from the middle fixing rod, the lower fixing sleeve and diagonal support rod of the lifting device, and the next lifting operation is carried out. d. After the first segment is installed and a closed ring is formed, the soil is excavated downwards to the depth of the second segment. The segments are then lifted and installed using the lifting device. The installation trolley 2 is moved to assist in the installation of the segments. e. Steps c and d are repeated until the foundation is reached, completing the segment installation of the circular well wall structure.
[0005] Furthermore, in step c, longitudinal connecting bars are inserted into the longitudinal through holes and connected vertical grooves of the segment, and cement grout is injected into the central cavity of the longitudinal through holes, vertical grooves and annular grooves to fill and compact them; after the anchoring bars are inserted into the horizontal through holes, cement grout is also injected to fill and compact them, and C20 fine stone concrete or cement mortar is pressure-injected into the outside of the segment to fill and compact it.
[0006] Furthermore, in step c, the electric hoist on the lifting beam of the mobile installation trolley is used to lift the pipe segments, and the position of the counterweight on the longitudinal beam is adjusted according to the position of the pipe segments, so that the pipe segments are assembled into a closed ring in sequence.
[0007] The beneficial effects of this invention are as follows: During actual hoisting, the combined load-bearing structure, consisting of a fixed rod in the middle of the hoisting rod, a fixed sleeve at the bottom of the hoisting rod, and an inclined support rod, allows the tunnel segments to be conveniently and stably mounted on the hoisting device. This enables rapid separation of the hoisting device from the tunnel segments after hoisting to the installation position. Secondly, since the main body of the hoisting device is the hoisting rod, when the hoisting rod is vertically positioned, it only occupies a small space within the circular well wall structure, maximizing the construction space for the tunnel segments within the circular well wall structure. This allows for the hoisting and construction of tunnel segments even in circular well wall structures with small diameters, greatly expanding the application areas of precast tunnel segments in circular well walls. This invention is particularly suitable for the construction of precast tunnel segments in circular well walls. Attached Figure Description
[0008] Figure 1 This is a structural diagram of the construction process of the present invention.
[0009] Figure 2 This is a schematic diagram showing the connection relationship between the bottom of the tunnel segment and the various supporting components of the lifting device.
[0010] Figure 3 This is a schematic diagram showing the segments forming a closed ring.
[0011] Figure 4 This is a construction diagram showing the connection between tunnel segments.
[0012] The components in the diagram are marked as follows: 1. Circular well wall structure; 1.1. Segment; 1.2. Longitudinal through hole; 1.3. Vertical groove; 1.4. Connecting rib; 1.5. Horizontal through hole; 1.6. Annular groove; 1.7. Water-stop strip; 1.8. Longitudinal connecting rib; 1.9. Anchoring rib; 2. Moving installation trolley; 3. Lifting tool; 3.1. Lifting rod; 3.2. Connecting sleeve; 3.3. Fixing rod; 3.4. Fixing sleeve; 3.5. Diagonal support rod; 3.6. Circular hole; 3.7. Steel pin. Detailed Implementation
[0013] The invention will be further described below with reference to the accompanying drawings.
[0014] like Figure 1 , Figure 2 , Figure 3 , Figure 4 The construction method for precast segments of a circular well wall, as shown, includes the following steps: a) Production of segments 1.1 required for construction: The shape and size of segments 1.1 are designed according to the internal dimensions of the circular well wall structure 1, the geological conditions of the construction site, and the surrounding environmental factors, and prefabricated in the factory; b) Construction positioning and layout, and layered excavation of earthwork. The excavation diameter is 100-200mm longer than the internal diameter of the circular well wall structure 1. After excavating to the depth of the installation position of the first segment 1.1, the installation of segments 1.1 begins; c) The mobile installation trolley 2 is driven to lift segments 1.1. The lifting method is as follows: The mobile installation trolley 2 is equipped with a lifting device 3. The fixing rod 3.3 in the middle of the lifting rod 3.1 of the lifting device 3 passes through the segment 1.1 and is locked by the fixing sleeve 3.4 and the steel pin 3.7. The fixing sleeve 3.3 and the diagonal support rod 3.5 at the bottom of the lifting rod 3.1 support the segment. At the bottom of segment 1.1, segment 1.1 is fixed again by fixing sleeve 3.4 and steel pin 3.7. Then, segment 1.1 is assembled into a closed ring in sequence. Adjacent segments 1.1 are connected by vertical groove 1.3. Water-stop strips 1.7 are installed between segments 1.1 and welded together by connecting ribs 1.4. After segment 1.1 is installed, segment 1.1 is removed from the middle fixing rod 3.3, the lower fixing sleeve 3.3 and the inclined support rod 3.5 of the lifting device 3, and the next segment 1.1 is hoisted and installed. d. After the first segment 1.1 is installed and a closed ring is formed, the soil is excavated downwards to the depth of the second segment 1.1. Then, segment 1.1 is hoisted and installed by the lifting device 3. The installation trolley 2 is moved to assist in the installation of segment 1.1. e. Steps c and d are repeated until the foundation is reached, and the segment installation of the circular well wall structure 1 is completed.
[0015] The circular well wall structure 1 includes three longitudinal through holes 1.2 spaced apart at both ends within each segment 1.1, an annular groove 1.6 on the upper part of the segment, and one groove on the middle sidewall. The well wall structure consists of a circular horizontal through hole 1.5, vertical grooves 1.3 on both sides, and two connecting ribs 1.4 pre-embedded therein. The well wall structure is assembled from several segments 1.1 along the longitudinal and circumferential directions. The longitudinal through hole 1.2 is provided with longitudinal connecting ribs 1.8, which extend from the upper and lower ends of the longitudinal through hole 1.2 to connect the upper and lower segments 1.1. The segments are welded together on both sides of the circumferential direction with connecting ribs 1.4. Water-stop strips 1.7 are provided on the inner and outer sides between two adjacent segments 1.1 in the longitudinal and circumferential directions. The central cavity is filled with cement grout. Longitudinal through holes 1.2 are evenly arranged along the middle of the segments 1.1. Each layer of segments 1.1 is joined with staggered joints to ensure that the longitudinal through holes 1.2 of the upper and lower segments 1.1 are connected. Longitudinal connecting ribs 1.8 can be smoothly inserted into the holes. The longitudinal connecting ribs 1.8 are made of steel bars and are vertically connected by welding or mechanical connection. Cement grout is poured into the longitudinal through holes 1.2 to effectively fix the longitudinal connecting ribs 1.8, prevent them from moving up and down, and improve the adhesion between the steel bars and the cement grout. The longitudinal connecting ribs 1.8 and the poured cement grout columns connect the segments 1.1 to each other, improving the overall rigidity of the well wall. Water-stop strips 1.7 are provided between the vertical grooves 1.3 of two adjacent annular segments and are connected by connecting ribs 1.4. The longitudinal connecting ribs 1.8 are installed in the middle of the grooves and are filled with cement grout to make them dense. An annular groove 1.6 is provided between two adjacent segments 1.1 along the longitudinal direction. The annular groove 1.6 is arranged around the perimeter of the well wall, and water-stop strips 1.7 are provided on the inner and outer sides. The central cavity enclosed by the water-stop strips 1.7 is filled with cement grout, which provides waterproof performance and integrity to the well wall structure. The cement grout used is micro-expansion cement. The lifting rod 3.1 of the lifting device 3 adopts... Made of round steel, the fixing rod 3.3 and the diagonal support rod 3.5 are... Made of round steel, the connecting sleeve 3.2 and the fixing sleeve 3.4 are threaded internally. The upper end of the lifting rod 3.1 is welded with a lifting ring, and a fixing rod 3.3 is vertically welded in the middle. The lower end is threaded and fitted with the connecting sleeve 3.2. The side of the connecting sleeve 3.2 is welded to a fixing rod 3.3 and two diagonal support rods 3.5 to form a whole. The lower fixing rod and diagonal support rods are arranged in a triangular pattern. One end of the two fixing rods 3.3 is threaded and fitted with the fixing sleeve 3.4, and the other end has no less than two round holes 3.6. The middle fixing rod 3.3 passes through the tube segment and is locked to the tube segment by the fixing sleeve 3.4 and the steel pin 3.7. The lower fixing sleeve 3.3 and the two diagonal support rods support the bottom of the tube segment 1.1 and are again fixed to the tube segment by the fixing sleeve 3.4 and the steel pin 3.7 to prevent slippage and enhance stability.
[0016] To further improve the structural stability of segment 1.1, the following scheme can be selected: In step c, longitudinal connecting bars 1.8 are inserted into the longitudinal through holes 1.2 and the connected vertical grooves 1.3 of segment 1.1, and cement grout is injected into the central cavity of the longitudinal through holes 1.2, vertical grooves 1.3, and annular grooves to fill them tightly; anchoring bars 1.9 are inserted into the horizontal through holes 1.5 and then cement grout is injected to fill them tightly, and C20 fine stone concrete or cement mortar is pressure-filled and filled tightly on the outside of segment 1.1. In actual hoisting, step c can be selected, using the electric hoist on the lifting beam of the mobile installation trolley 2 to lift segment 1.1, and adjusting the position of the counterweight on the longitudinal beam according to the position of segment 1.1, and assembling segment 1.1 into a closed ring in sequence.
Claims
1. A method for constructing precast tunnel segments for circular well walls, characterized in that, Includes the following steps: a. Segment (1.1) required for production and construction: The shape and size of the segment (1.1) are designed according to the internal dimensions of the circular well wall structure (1), the geological conditions of the construction site and the surrounding environmental factors, and are prefabricated in the factory; b. Construction positioning and layout, layered excavation of earthwork, the excavation diameter is 100-200mm longer than the inner diameter of the circular well wall structure (1), after excavating to the depth of the installation position of the first segment (1.1), the segment (1.1) is installed. c. Drive the mobile installation trolley (2) to lift the segment (1.1). The lifting method is as follows: The mobile installation trolley (2) is equipped with a lifting device (3). The fixing rod (3.3) in the middle of the lifting rod (3.1) of the lifting device (3) passes through the segment (1.1) and locks the segment through the fixing sleeve (3.4) and the steel pin (3.7). The fixing sleeve (3.4) and the inclined support rod (3.5) at the bottom of the lifting rod (3.1) support the bottom of the segment (1.1). The segment (1.1) is fixed again through the fixing sleeve (3.4) and the steel pin (3.7). Then, the segments (1.1) are assembled into a closed ring in sequence, and the adjacent segments (1.1) are connected. 1) Connect the segments (1.1) through the vertical groove (1.3), install the water-stop strip (1.7) between the segments (1.1) and weld them together through the connecting bar (1.4). After the segment (1.1) is installed, remove the segment (1.1) from the middle fixing rod (3.3), the lower fixing sleeve (3.4) and the inclined support rod (3.5) of the lifting device (3) and carry out the hoisting construction of the next segment (1.1); use the electric hoist on the lifting beam of the mobile installation trolley (2) to lift the segment (1.1) and adjust the position of the counterweight on the longitudinal beam according to the position of the segment (1.1) to assemble the segments (1.1) into a closed ring in sequence; d. After the first segment (1.1) is installed and a closed ring is formed, continue to dig downwards to the depth of the second segment (1.1). Then, continue to lift and install the segment (1.1) using the lifting equipment (3). Move the installation trolley (2) to cooperate with the installation of the segment (1.1). e. Repeat steps c and d until the work is carried out down to the base, and complete the segment installation of the circular well wall structure (1).
2. The construction method for precast segments of circular well walls as described in claim 1, characterized in that: In step c, longitudinal connecting bars (1.8) are inserted into the longitudinal through hole (1.2) and the connected vertical groove (1.3) of the segment (1.1), and cement grout is injected into the cavity in the middle of the longitudinal through hole (1.2), the vertical groove (1.3) and the annular groove to fill it tightly; after the anchoring steel bar (1.9) is inserted into the horizontal through hole (1.5), cement grout is injected to fill it tightly, and C20 fine stone concrete or cement mortar is pressure-injected into the outside of the segment (1.1) to fill it tightly.