An elastic supporting structure of an externally adjustable yielding steel structure of a pipe segment and a construction method thereof

Abstract

The application discloses a kind of elastic supporting structure and construction method of adjustable type yielding steel structure outside segment, supporting structure includes surrounding rock, steel plate, recessed segment, spring, spring compression rod, gasket, nut, spring compression rod reserved hole;Steel plate is installed in the recess of concave segment, is supported by compressed spring, when bean stone is not in time to fill the gap between segment and surrounding rock, by releasing spring makes steel plate and surrounding rock contact to stabilize surrounding rock, then slowly fill bean stone, grouting again;Construction method includes prefabricated recessed segment, spring is embedded in segment, drill spring compression rod reserved hole, spring compression rod, gasket and nut combination compression spring, install steel plate, segment structure overall construction support.The application can solve the problem that surrounding rock continues to be unstable and deformed due to the gap between segment and surrounding rock cannot be filled and grouted in time during the process of hydraulic tunnel excavation support, plays the role of rapid support of surrounding rock, stabilizes surrounding rock.

Description

Technical Field

[0001] This invention relates to the lining support structure of hydraulic tunnels, specifically an elastic support structure and construction method of an adjustable pressure-relief steel structure outside the tunnel segments. Background Technology

[0002] As the scale of water diversion projects in my country gradually increases, and the number of inter-regional water transfer projects grows, the depth, diameter, and length of hydraulic tunnels, which are the main components of these projects, are also increasing, leading to more complex engineering geological and hydrogeological conditions. However, the current lining support method uses steel formwork trolleys to tie reinforcing bars and pour concrete. This method creates gaps between the surrounding rock and the lining. If these gaps are not backfilled with grout in a timely manner, the surrounding rock may continue to destabilize and deform without proper restraint, increasing the risks of the tunnel project.

[0003] To address this risk and enhance the support capacity of the lining structure, a steel plate is installed on the grooved segment. Beneath the steel plate is a compressed spring. If backfilling is not possible in time, the spring can be released to bring the steel plate into contact with the surrounding rock, stabilizing the rock, before backfilling and grouting can proceed slowly. This method is highly effective in resolving situations where existing lining support structures cannot be backfilled and grouted in time. Summary of the Invention

[0004] The purpose of this invention is to provide an elastic support structure and construction method for an adjustable pressure relief steel structure outside the tunnel segments. This can solve the risk that the surrounding rock may continue to become unstable and deform when the existing lining support cannot be backfilled and grouted in time, thus ensuring the safety of the hydraulic tunnel support structure and the stability of the surrounding rock, and solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows: An elastic support structure for an adjustable pressure-relief steel structure outside a pipe segment includes surrounding rock, a grooved pipe segment, a steel plate, a spring, a spring compression rod, a nut, a washer, and a pre-drilled hole for the spring compression rod located on the grooved pipe segment; the surrounding rock is located outside the grooved pipe segment, the spring is located in the groove of the grooved pipe segment, the upper part of the spring compression rod rests on the spring, the lower part passes through the pre-drilled hole for the spring compression rod, the steel plate is located on the spring, the washer is located under the grooved pipe segment and is fitted into the spring compression rod, and the nut is located under the washer and is fitted into the spring compression rod.

[0006] Furthermore, the grooved segment is a reinforced concrete structure that can withstand the pressure of the surrounding rock and maintain the stability of the surrounding rock. The reinforcement, structural dimensions, and hole size of the grooved segment are all determined according to the actual site conditions.

[0007] Furthermore, the steel plate is a high-strength, durable steel material. The thickness of the steel plate is determined according to the actual site conditions. The size and curvature of the steel plate are the same as those of the groove of the grooved tube segment, ensuring that the outer surface of the steel plate and the outermost surface of the grooved tube segment are on the same curved surface. This also serves to withstand the pressure of the surrounding rock and maintain the stability of the surrounding rock.

[0008] Furthermore, the size and quantity of the springs need to be determined based on the actual rock support conditions of the project. The springs are symmetrically distributed to prevent uneven force distribution and can also serve as elastic supports.

[0009] Furthermore, the reserved hole of the spring compression rod allows the spring compression rod to fit through, and the thread specification on the spring compression rod is the same as the thread specification of the nut.

[0010] Furthermore, the upper part of the spring compression rod rests on the top of the spring, and the lower part passes through the reserved hole of the spring compression rod to combine with the washer and the nut. The spring will be compressed as the nut is tightened. When the nut is loosened, the spring release steel plate pops out to directly contact the surrounding rock to provide rapid support and stabilize the surrounding rock.

[0011] This invention also provides a construction method for an elastic support structure of an externally adjustable pressure-relief steel structure for tunnel segments, comprising the following construction steps:

[0012] Step 1: Prefabricate grooved segments, including pre-embedded springs. The reinforcement and dimensions of the grooved segments are determined according to the actual conditions of the project site. The specifications and quantity of the springs are determined according to the support force required at the project site.

[0013] Step 2: Fabricate key components, including steel plates, spring compression rods, nuts, and washers. The thickness of the steel plates is determined according to the actual project conditions. The dimensions and curvature of the steel plates are the same as those of the grooved sections of the grooved tubes. The thread specifications of the spring compression rods and nuts are the same and meet the project requirements.

[0014] Step 3: Drill the pre-drilled hole for the spring compression rod, ensuring the size is suitable for the spring compression rod to pass through.

[0015] Step 4: Place the upper part of the spring compression rod on top of the spring, and pass the lower part through the pre-drilled hole in the spring compression rod to combine with the washer and nut, and tighten the nut to compress the spring.

[0016] Step 5: Place the steel plate on the spring in the groove of the grooved pipe segment and perform surrounding rock support.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention has a simple structure, reasonable design, mature construction technology and construction methods, and the lining structure of the present invention adopts a prefabricated form, which can effectively speed up the construction progress; The present invention can solve the problem that when there is a gap between the lining and the surrounding rock under the existing lining support form, and the grout cannot be backfilled in time, the surrounding rock may continue to become unstable and deformed, thus ensuring the safety of the hydraulic tunnel support structure and the stability of the surrounding rock; The structural dimensions of the present invention are relatively flexible, and the reinforcement and thickness of the grooved segments, the steel plate material and thickness, the number and distribution of springs, etc. can all be determined according to the actual situation of the project. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 This is a schematic diagram of the grooved tube segment in this invention.

[0020] Figure 3 This is a schematic diagram showing the positions of the grooved tube sheet and the steel plate in this invention.

[0021] Figure 4 This is a schematic diagram showing the positions of the grooved tube and the spring in this invention.

[0022] Figure 5 This is a schematic diagram of the spring compression assembly structure in this invention.

[0023] Among them, 1-surrounding rock; 2-grooved segment; 3-steel plate; 4-spring; 5-spring compression rod; 6-nut; 7-washer; 201-spring compression rod reserved hole; Detailed Implementation

[0024] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments and accompanying drawings. It should be understood that the embodiments described below are merely a part of the present invention, and not all of the embodiments. All other embodiments obtained based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0025] like Figure 1-5As shown, an elastic support structure for an adjustable pressure-relief steel structure outside a pipe segment according to the present invention includes surrounding rock 1, grooved pipe segment 2, steel plate 3, spring 4, spring compression rod 5, nut 6, washer 7, and a pre-drilled hole 201 for the spring compression rod located on the grooved pipe segment 2; the surrounding rock 1 is located outside the grooved pipe segment 2, and the spring 4 is located inside the groove of the grooved pipe segment 2, 15cm away from the edge of the groove. The four springs 4 are centrally symmetrically distributed. The springs 4 are pre-embedded during the casting of the grooved pipe segment 2 so that the springs 4 are tightly connected to the grooved pipe segment 2 to form an integral whole. The spring compression rod... The upper short rod of rod 5 rests on top of the spring 4, and the lower long rod passes through the reserved hole 201 of the spring compression rod. The spring compression rod 5 and the spring 4 are connected as one unit by welding to prevent the spring compression rod 5 and the spring 4 from moving or misaligning when the spring is compressed. The steel plate 3 is located on top of the spring 4. The washer 7 is located under the grooved tube 2 and is fitted into the spring compression rod 5. The nut 6 is located under the washer 7 and is fitted into the spring compression rod 5. The nut 6 and the washer 7 are combined to fix the spring compression rod 5.

[0026] like Figure 2 As shown, the grooved segment 2 is a reinforced concrete structure. The grooved segment 2 is located inside the surrounding rock 1 and plays the role of supporting the surrounding rock. The reinforcement, structural dimensions and tunnel size of the grooved segment 2 are calculated based on the actual size of the tunnel and the deformation of the surrounding rock on site. The required support force of the grooved segment 2 is then determined.

[0027] like Figure 3 As shown, the steel plate 3 is a high-strength, durable steel material. The thickness of the steel plate is determined according to the actual site conditions. The size and curvature of the steel plate are the same as the groove of the grooved tube 2, ensuring that the outer surface of the steel plate 3 and the outermost surface of the grooved tube 2 are on the same curved surface.

[0028] like Figure 4 As shown, the size and quantity of the springs 4 need to be determined according to the actual rock support conditions of the project. The springs 4 are symmetrically distributed to prevent uneven force distribution.

[0029] like Figure 5 As shown, the upper part of the spring compression rod 5 rests on the upper side of the spring 4, and the lower part passes through the reserved hole 201 of the spring compression rod to combine with the washer 7 and the nut 6. The spring 4 will be compressed as the nut 6 is tightened. When the nut is loosened, the spring release steel plate pops out to directly contact the surrounding rock to provide rapid support and stabilize the surrounding rock.

[0030] The present invention discloses a construction method for an elastic support structure of an externally adjustable pressure-relief steel structure for tunnel segments, comprising the following construction steps:

[0031] Step 1: Prefabricate the grooved tube segment 2, including the pre-embedded spring 4. The reinforcement and dimensions of the grooved tube segment 2 are determined according to the actual conditions of the project site. The specifications and quantity of the spring 4 are determined according to the support force required at the project site.

[0032] Step 2: Fabricate key components, including steel plate 3, spring compression rod 5, nut 6, and washer 7. The thickness of steel plate 3 is determined according to the support force required to control the deformation of the surrounding rock in the actual project. That is, when the required support force is large, a larger thickness of steel plate 3 is selected, and vice versa. The dimensions of steel plate 3 are the same as the curvature and the groove of the grooved tube 2. The thread specifications of spring compression rod 5 and nut 6 are the same and meet the project requirements.

[0033] Step 3: Drill the reserved hole 201 for the spring compression rod, ensuring that the spring compression rod 5 fits through it.

[0034] Step 4: Place the upper part of the spring compression rod 5 on top of the spring 4, and pass the lower part through the reserved hole 201 of the spring compression rod to combine with the washer 7 and nut 6, and tighten the nut 6 to compress the spring 4.

[0035] Step 5: Place the steel plate 3 on the spring 4 in the groove of the grooved pipe segment 2 and perform surrounding rock support.

[0036] Step 6: After the elastic support structure is installed, when the surrounding rock 1 continues to deform, in order to prevent the surrounding rock from deforming, loosen the nut 6 so that the spring 4, which is in a compressed state, is released and the steel plate holds the surrounding rock to provide support force.

[0037] Furthermore, this specification should be considered as a whole, and the above-described embodiments are not the only independent technical solutions of this invention. The technical solutions in the embodiments can be appropriately combined and adjusted to form other embodiments that can be understood by those skilled in the art.

Claims

1. An elastic support structure for an externally adjustable pressure-relief steel structure for tunnel segments, characterized in that: The system includes surrounding rock (1), grooved pipe segment (2), steel plate (3), spring (4), spring compression rod (5), nut (6), and washer (7); the surrounding rock (1) is located outside the grooved pipe segment (2), the spring (4) is embedded in the groove of the grooved pipe segment (2), the upper part of the spring compression rod (5) overlaps the upper end of the spring (4), and the lower part passes through the spring compression rod reserved hole (201) opened on the grooved pipe segment (2); the steel plate (3) is set above the spring (4), and the outer surface of the steel plate (3) and the outer surface of the grooved pipe segment (2) are on the same curved surface; the washer (7) is sleeved on the lower end of the spring compression rod (5) and located below the grooved pipe segment (2), and the nut (6) is screwed on. The threaded section of the spring compression rod (5) abuts against the lower surface of the gasket (7). By tightening the nut (6), the spring (4) is in a pre-compression locked state so that the steel plate (3) can be ejected outward to press against the surrounding rock when it is released later. The diameter of the reserved hole (201) of the spring compression rod matches the diameter of the spring compression rod (5), and the thread specification of the spring compression rod (5) is the same as the thread specification of the nut (6). There are multiple springs (4), which are symmetrically distributed in the groove of the grooved tube segment (2). The specifications and number of the springs (4) are determined according to the requirements of the surrounding rock support force. The grooved tube segment (2) is a reinforced concrete structure. The reinforcement, structural dimensions and the size of the hole are determined according to the actual site conditions.

2. The elastic support structure for an externally adjustable pressure-relief steel structure of a tunnel segment according to claim 1, characterized in that: The steel plate (3) is made of high-strength and durable steel, and its thickness and curvature are determined according to the surrounding rock pressure and deformation at the site.

3. A construction method for an elastic support structure of an adjustable pressure-relief steel structure for tunnel segments as described in any one of claims 1-2, characterized in that, Includes the following steps: Step 1: Prefabricate the grooved tube segment (2) and embed the spring (4) at the bottom of its groove; Step 2: Make the steel plate (3), spring compression rod (5), nut (6) and washer (7); Step 3: Drill a pre-drilled hole (201) for the spring compression rod at the corresponding position on the grooved tube (2); Step 4: The upper part of the spring compression rod (5) is attached to the spring (4), the lower part passes through the reserved hole (201), and a washer (7) and a nut (6) are installed below. Before the entire tube is installed, tighten the nut (6) to compress and store energy in the spring (4) and lock it. Step 5: Place the steel plate (3) on top of the spring (4) and install the entire tube segment; Step 6: After the entire segment is installed, when the surrounding rock deforms and requires support, loosen the nut (6) to release the preload of the spring (4) so ​​that the steel plate (3) pops out to contact and support the surrounding rock.

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