A method for protecting a closely attached gravity retaining system of a subway station and its construction method

Abstract

The present invention discloses a gravity support system and construction method for protecting a subway station in close proximity, which relates to the technical field of foundation pit support, including a support frame and a bearing platform arranged layer by layer, wherein a plurality of water tanks are arranged on the bearing platform, and a connecting pipe and a receiving and locking mechanism are arranged on the water tank, wherein the connecting pipe is horizontally connected to the bottom of the water tank; and the receiving and locking mechanism is used to receive and lock the connecting pipe. The present invention provides a gravity support system and construction method for protecting a subway station in close proximity. When laying out the water tank ballast system, the connecting pipe of one water tank is inserted into the receiving and locking mechanism of another water tank, and the connecting pipe can be connected and locked by the receiving and locking mechanism, so that two adjacent water tanks are connected and locked together through the connecting pipe, and then water is poured into one water tank to keep the same liquid level height in multiple water tanks that are connected to each other.

Description

Technical Field

[0001] The present invention relates to the technical field of foundation pit support, and specifically relates to a gravity support system and construction method for protecting closely adjacent subway stations. Background Art

[0002] Foundation pit support refers to the support measures taken during the earth excavation process to ensure the safety and stability of the foundation pit and prevent adjacent structures from being affected. For the foundation pit support adjacent to a subway station, a more stringent support system is required to avoid affecting the subway station.

[0003] For example, in the patent document with the authorization announcement number CN115305966B, the authorization announcement date of October 13, 2023, and the name "A Construction Method for a Gravity Support System for Protecting Closely Adjacent Subway Stations", it includes: constructing a foundation pit retaining structure outside the subway station, excavating the foundation pit and leaving a counter-pressure soil body on the side of the foundation pit retaining structure close to the subway station, excavating the counter-pressure soil body, pouring concrete to form a support frame, and arranging a combined water tank ballast system on the existing support frame until the excavation of the counter-pressure soil body is completed. This patent avoids the impact of large-area excavation and unloading of a single-sided foundation pit on the structural safety of the operating subway station.

[0004] In the prior art, the water tank ballast system is arranged layer by layer as the foundation pit is excavated. For several water tanks on the same layer, it is rather cumbersome to inject water into the several water tanks separately, and it is not convenient to synchronously control the liquid levels in the several water tanks. Summary of the Invention

[0005] The purpose of the present invention is to provide a gravity support system and construction method for protecting closely adjacent subway stations to solve the above deficiencies in the prior art.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A gravity support system for protecting closely adjacent subway stations includes a support frame and load-bearing platforms arranged layer by layer. A number of water tanks are arranged on the load-bearing platforms, and the water tanks are provided with:

[0008] A connecting pipe horizontally connected to the bottom of the water tank;

[0009] A receiving and locking mechanism for receiving the connecting pipe and locking the connecting pipe.

[0010] In the above-mentioned gravity support system for protecting closely adjacent subway stations, the receiving and locking mechanism includes a receiving pipe fixedly connected to the water tank and a sliding plate slidably connected inside the water tank. A clamping groove is formed on the connecting pipe.

[0011] The above-mentioned gravity support system is used to protect a subway station in close proximity. A first blocking plate is hinged on the slide plate, and a first torsion spring is arranged between the slide plate and the first blocking plate.

[0012] The above-mentioned gravity support system is used to protect a subway station in close proximity, and the sum of the thicknesses of the slide plate and the first blocking plate is the same as the width of the clamping groove.

[0013] The above-mentioned gravity support system for protecting and closely fitting a subway station, the receiving and locking mechanism also includes a limiting block fixed to the inner wall of the water tank and a first elastic member for forcing the slide plate to approach the limiting block.

[0014] The above-mentioned gravity support system is used to protect the subway station closely. A handle is vertically inserted into the inner wall of the water tank. The top of the handle is exposed from the water tank, and the bottom is fixed to the slide plate.

[0015] The above-mentioned gravity support system is used to protect a subway station in close proximity. A second sealing plate is hinged in the water tank, and a second torsion spring is arranged on the water tank to force the second sealing plate to seal the connecting pipe.

[0016] The above-mentioned gravity support system is used to protect a close-fitting subway station. A sliding rod is slidably connected in the connecting pipe. One end of the sliding rod is constructed with a wedge surface and the wedge surface is located in the clamping groove, and the other end is in contact with the second sealing plate.

[0017] The above-mentioned gravity support system is used to protect a close-fitting subway station. A first mounting seat and a second mounting seat are fixed to the bottom of the water tank. The first mounting seat is rotatably connected to a first roller, and the second mounting seat is rotatably connected to a second roller. The first mounting seat is slidably connected to a brake rod, and the brake rod extends into the water tank. The brake rod has a wedge-shaped portion at the top and a friction portion at the bottom. A second elastic member is arranged in the water tank to force the friction portion away from the first roller.

[0018] A construction method for protecting a gravity support system of a close-fitting subway station is provided. The method is based on any of the above support systems and connects and locks two adjacent water tanks through a connecting pipe and a receiving locking mechanism.

[0019] In the above technical scheme, the present invention provides a gravity support system and construction method for protecting a close-fitting subway station. When laying out the water tank ballast system, the connecting pipe of one water tank is inserted into the receiving and locking mechanism of another water tank. The connecting pipe can be connected and locked through the receiving and locking mechanism, so that two adjacent water tanks are connected and locked together through the connecting pipe. Subsequently, water is poured into one water tank to maintain the same liquid level height in multiple interconnected water tanks. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0021] Figure 1 Schematic diagram of the overall structure provided by the embodiment of the present invention;

[0022] Figure 2 Top view of two adjacent water tanks provided by another embodiment of the present invention;

[0023] Figure 3 Front view of two adjacent water tanks provided by another embodiment of the present invention;

[0024] Figure 4 Schematic diagram of the structure at the receiving pipe and the connecting pipe provided by another embodiment of the present invention;

[0025] Figure 5 Schematic diagram of the sliding rod structure provided by another embodiment of the present invention;

[0026] Figure 6 Schematic diagram of the structure of the second plugging plate provided by another embodiment of the present invention;

[0027] Figure 7 Schematic diagram of the structure of the clamping groove provided by another embodiment of the present invention;

[0028] Figure 8 Schematic diagram of the structure of the braking rod and the abutting rod provided by another embodiment of the present invention.

[0029] Explanation of reference numerals:

[0030] 1, support frame; 2, bearing platform; 3, water tank; 4, connecting pipe; 5, top cover; 6, receiving pipe; 7, sliding plate; 8, clamping groove; 9, first plugging plate; 10, limiting block; 11, first elastic member; 12, handle; 13, second plugging plate; 14, sliding rod; 141, wedge surface; 15, first mounting seat; 16, second mounting seat; 17, first roller; 18, second roller; 19, braking rod; 191, wedge portion; 192, friction portion; 20, second elastic member; 21, abutting rod; 211, first abutting portion; 212, second abutting portion; 22, sealing cloth. Detailed implementation manners

[0031] To enable those skilled in the art to better understand the technical solutions of the present invention, the following will further introduce the present invention in detail in conjunction with the drawings.

[0032] Refer to Figure 1-8An embodiment of the present invention provides a gravity support system for protecting a close-fitting subway station, including a support frame 1 and a bearing platform 2 arranged layer by layer, wherein a plurality of water tanks 3 are arranged on the bearing platform 2, and a connecting pipe 4 and a receiving and locking mechanism are arranged on the water tank 3, wherein the connecting pipe 4 is horizontally connected to the bottom of the water tank 3; and the receiving and locking mechanism is used to receive the connecting pipe 4 and lock the connecting pipe 4.

[0033] Specifically, when excavating a foundation pit at a location close to a subway station, counter-pressure soil will be reserved on the side of the foundation pit close to the subway station to maintain the stability of the foundation pit and the subway station. The cross-section of the counter-pressure soil is generally triangular or trapezoidal. Subsequently, steel structure and concrete are arranged on the counter-pressure soil to form a support frame 1, and then the counter-pressure soil can be excavated layer by layer. After completing the excavation of one layer, it is necessary to build a bearing platform 2 on that layer and lay a water tank ballast system to simulate the weight of the counter-pressure soil. In this way, the support system of the foundation pit close to the subway station can be formed by excavating the soil layer by layer and laying out the water tank ballast system. The above are all existing technologies and will not be repeated here. The innovation of the embodiment of the present invention is that a connecting pipe 4 and a receiving and locking mechanism are arranged on the water tank 3, the connecting pipe 4 is connected to the water tank 3 and is horizontally arranged at the bottom of the water tank 3, and the receiving and locking mechanism can be a combination of a pipe body and a locking structure, so that the connecting pipe 4 of one water tank 3 can be inserted into the pipe body of another water tank 3 and the pipe body and the connecting pipe 4 can be locked by the locking structure, so that the two adjacent water tanks 3 can be connected through the connecting pipe 4, and the relative positions of the two adjacent water tanks 3 can be limited by the connecting pipe 4. The advantage of such a configuration is that after two adjacent water tanks 3 are connected and locked through the connecting pipe 4, it is only necessary to inject water into one water tank 3 to maintain the same liquid level height in the multiple water tanks 3 that are interconnected through the connecting pipe 4. The amount of water injected is then controlled to control the total weight of the water tank ballast system of this layer to be the same as the weight of the back-pressure soil excavated in this layer, thereby simulating the load applied by the original back-pressure soil to the support frame 1 through the supporting platform 2 and the multiple water tanks 3 on the supporting platform 2. Since the liquid level heights in the multiple water tanks 3 are basically the same, the loads applied by the multiple water tanks 3 to the supporting platform 2 are basically the same, thereby improving the stability of the overall support frame 1.

[0034] It should be noted that a top cover 5 is constructed on the top of the water tank 3. After the top cover 5 is opened, water can be poured into the water tank 3. Air holes are reserved on the top cover 5 to connect the top of the water tank 3 with the outside air, so that after two adjacent water tanks 3 are connected to each other, the liquids in the water tanks 3 can flow to each other to form the same liquid level height.

[0035] An embodiment of the present invention provides a gravity support system for protecting a close-fitting subway station. When a water tank ballast system is laid out, a connecting pipe 4 of one water tank 3 is inserted into a receiving and locking mechanism of another water tank 3. The connecting pipe 4 can be connected and locked through the receiving and locking mechanism, so that two adjacent water tanks 3 are connected and locked together through the connecting pipe 4. Subsequently, water is injected into one water tank 3 to maintain the same liquid level height in multiple water tanks 3 that are connected to each other.

[0036] In another embodiment of the present invention, as an alternative to the above-mentioned receiving and locking mechanism, the receiving and locking mechanism preferably comprises a receiving tube 6 fixedly connected to the water tank 3 and a slide plate 7 slidably connected to the water tank 3, and a clamping groove 8 is configured on the connecting tube 4. Specifically, Figures 4-6 They are the connecting pipe 4 and the receiving pipe 6 parts of two adjacent water tanks 3 that are plugged into each other; the receiving pipe 6 and the connecting pipe 4 are both horizontally arranged and respectively located on opposite sides of the water tank 3, and the receiving pipe 6 and the horizontal pipe (central axis) are located at the same height at the bottom of the water tank 3, and the two can be plugged in through interference fit. Preferably, the inner diameter of the receiving pipe 6 is slightly larger than the outer diameter of the connecting pipe 4, and a number of rubber sealing rings are embedded in the inner wall of the receiving pipe 6 to enable the connecting pipe 4 and the receiving pipe 6 to be plugged in and sealed with each other; the slide plate 7 is slidably connected to the inner wall of the water tank 3, and the sliding rail structure in the prior art can be selected as the sliding connection method between the two; the clamping groove 8 is constructed at the top of the connecting pipe 4, and the slide plate 7 is located at the top of the receiving pipe 6. In this embodiment, the slide plate 7 is adapted to the clamping groove 8, and a manual or electric linear drive structure (such as an electric push rod or a cylinder) can be set in the water tank 3 to drive the slide plate 7 to embed into the corresponding clamping groove 8, thereby locking the relative positions of the connecting pipe 4 and the receiving pipe 6. The advantage of such an arrangement is that when multiple water tanks 3 are arranged, the positions of the water tanks 3 can be arranged in sequence so that the connecting pipe 4 on the second water tank 3 is inserted into the receiving pipe 6 of the first (i.e., the adjacent) water tank 3, thereby locking the connecting pipe 4 on the second water tank 3 through the slide 7 in the first water tank 3, thereby limiting the positions of the two adjacent water tanks 3 and avoiding the position displacement of the water tanks 3 on the supporting platform 2 as much as possible. At the same time, the connecting pipe 4 and the receiving pipe 6 are connected to each other so that the two adjacent water tanks 3 can be connected to each other, thereby keeping the liquid levels in the two adjacent water tanks 3 at the same height.

[0037] As an alternative solution for the above-mentioned slide plate 7 to fit the clamping groove 8, preferably, a first blocking plate 9 is hingedly connected to the slide plate 7, and a first torsion spring (the torsion spring structure is a prior art, not shown) is arranged between the slide plate 7 and the first blocking plate 9. The sum of the thickness of the slide plate 7 and the first blocking plate 9 is the same as the width of the clamping groove 8. Specifically, in the present embodiment, the first torsion spring can force the first blocking plate 9 away from the slide plate 7, so that the first blocking plate 9 and the slide plate 7 are in the same plane and are simultaneously attached to the inner wall of the water tank 3. At this time, the first blocking plate 9 can block the end of the receiving tube 6 located in the water tank 3. When the connecting pipe 4 is inserted into the receiving tube 6 (the description of the mutual insertion of the connecting pipe 4 and the receiving tube 6 in the text is based on the mutual insertion of two adjacent water tanks 3, that is, the connecting pipe 4 of one water tank 3 is inserted into the receiving tube 6 of another water tank 3), the connecting pipe 4 resists the first blocking plate 9 to force the first blocking plate 9 to rotate to a position close to vertical with the slide plate 7 until the engaging groove 8 on the connecting pipe 4 moves to the bottom of the slide plate 7, and the slide plate 7 is controlled to move downward. At this time, the inner wall of the engaging groove 8 can force the first blocking plate 9 to further approach the slide plate 7 and attach to the slide plate 7, so that the engaging groove 8 is engaged (that is, embedded in the engaging groove 8) by the attached slide plate 7 and the first blocking plate 9. The advantage of such a configuration is that when two adjacent water tanks 3 are not connected through the connecting pipe 4, one end of the receiving pipe 6 located in the water tank 3 is blocked by the first sealing plate 9, so as to avoid impurities from entering the water tank 3 or water in the water tank 3 from flowing out through the receiving pipe 6 (the water tank 3 can be pre-filled with water, or liquid can be retained inside the water tank 3 when it is recycled). After the connecting pipe 4 is inserted into the receiving pipe 6, the first sealing plate 9 is passively opened to connect the two adjacent water tanks 3 through the connecting pipe 4, and then the first sealing plate 9 can also cooperate with the slide plate 7 to clamp the clamping groove 8 to lock the connecting pipe 4. Compared with the above-mentioned embodiment in which the clamping groove 8 is only clamped by the slide plate 7, the first sealing plate 9 and the slide plate 7 cooperate to clamp the clamping groove 8 more stably and firmly.

[0038] As an alternative to the above-mentioned linear drive structure for driving the slide plate 7 to slide along the inner wall of the water tank 3, preferably, the receiving and locking mechanism further includes a limiting block 10 fixed to the inner wall of the water tank 3 and a first elastic member 11 for forcing the slide plate 7 to approach the limiting block 10. A handle 12 is vertically inserted into the inner wall of the water tank 3. The top end of the handle 12 protrudes from the water tank 3, and the bottom end is fixed to the slide plate 7. Specifically, the limiting block 10 is located below the receiving pipe 6. The first elastic member 11 can be a spring structure in the prior art. One end of it is fixed to the inner wall of the water tank 3, and the other end is fixed to the slide plate 7 to force the slide plate 7 to approach the limiting block 10 through the first elastic member 11. A convex portion is formed on the inner wall of the water tank 3, and the handle 12 is inserted into the convex portion so that the slide plate 7 can be operated through the handle 12 to slide along the inner wall of the water tank 3. Since the slide plate 7 fits against the inner wall of the water tank 3, the slide plate 7 and the handle 12 cannot rotate on the convex portion. When the first elastic member 11 is a spring structure, the spring can be sleeved on the handle 12, with one end fixed to the convex portion and the other end fixed to the slide plate 7. In this way, the slide plate 7 and the handle 12 can be forced to approach the limiting block 10 through the first elastic member 11. When the connecting pipe 4 is not inserted into the receiving pipe 6, the first sealing plate 9 fits against the inner wall of the water tank 3 under the action of the first torsion spring and is in the same plane as the slide plate 7. At this time, the first elastic member 11 can force the slider and the handle 12 to approach the limiting block 10, so that the end of the first sealing plate 9 away from the slide plate 7 can abut against the limiting block 10 (as shown in Figure 6 ), thereby sealing the receiving pipe 6 through the first sealing plate 9, and pulling the handle 12 upward from outside the water tank 3 can drive the first sealing plate 9 to move upward to open the receiving pipe 6 (during the process, the first sealing plate 9 always fits against the inner wall of the water tank 3 under the action of the first torsion spring), which is convenient for controlling the opening or closing of the receiving pipe 6. When the connecting pipe 4 is inserted into the receiving pipe 6, the connecting pipe 4 can force the first sealing plate 9 to overcome the elastic force of the first torsion spring and rotate toward the side close to the slide plate 7, so that the hinge point of the first sealing plate 9 and the slide plate 7 abuts against the top of the connecting pipe 4 under the action of the first elastic member 11 (as shown in Figure 7 ). Until the clamping groove 8 moves to the bottom of the slide plate 7 along with the connecting pipe 4, the first sealing plate 9 fits against the slide plate 7 and is embedded in the clamping groove 8 under the action of the first elastic member 11 (as shown in Figure 4As shown in the figure), the connecting pipe 4 is locked in this way; when it is necessary to release the lock on the connecting pipe 4, pull the handle 12 upward so that the connecting pipe 4 can be removed from the corresponding receiving pipe 6, and then the first sealing plate 9 will reset under the action of the first torsion spring to release the handle 12, so as to seal the receiving pipe 6 again through the first sealing plate 9. The advantage of such a setting is that when the connecting pipe 4 is not inserted into the receiving pipe 6, the position of the sliding plate 7 can be controlled through the handle 12 and the first elastic member 11, and then the receiving pipe 6 can be sealed or opened through the first sealing plate 9, which is convenient for filling water into the water tank 3 or cleaning the water tank 3; when the connecting pipe 4 is inserted into the receiving pipe 6, the first elastic member 11 can drive the sliding plate 7 and the first sealing plate 9 to be passively embedded in the clamping groove 8 to clamp and lock the connecting pipe 4; when it is necessary to release the lock on the connecting pipe 4, pulling the handle 12 upward can drive the sliding plate 7 to move out of the clamping groove 8, thereby releasing the lock on the connecting pipe 4, which is convenient for locking or unlocking two adjacent water tanks 3.

[0039] Furthermore, a second sealing plate 13 is hinged in the water tank 3, and a second torsion spring (not shown) for forcing the second sealing plate 13 to seal the connecting pipe 4 is provided on the water tank 3. A sliding rod 14 is slidably connected in the connecting pipe 4. One end of the sliding rod 14 is provided with a wedge surface 141 and the wedge surface 141 is located in the clamping groove 8, and the other end abuts against the second sealing plate 13. Specifically, the second torsion spring is arranged in the water tank 3 to force the second sealing plate 13 to seal one end of the connecting pipe 4 located in the water tank 3. Optionally, the second torsion spring is arranged between the second sealing plate 13 and the water tank 3; an extension part is constructed on the inner wall of the connecting pipe 4, and the sliding rod 14 is inserted along the axial direction of the connecting pipe 4 on the extension part, and the sliding rod 14 has a certain sliding stroke on the extension part. In the normal state, the second sealing plate 13 seals the connecting pipe 4 under the action of the second torsion spring. At the same time, the second sealing plate 13 abuts against the sliding rod 14 to drive the sliding rod 14 to slide to one end of its stroke close to the clamping groove 8. At this time, if the sliding plate 7 is embedded in the clamping groove 8, the end of the hinge joint between the sliding plate 7 and the first sealing plate 9 can abut against the wedge surface 141 of the sliding rod 14 to force the sliding rod 14 away from the clamping groove 8, so as to abut against the second sealing plate 13 through the sliding rod 14, so that the second sealing plate 13 overcomes the elastic force of the second torsion spring and opens the connecting pipe 4 (as Figure 5As shown, it should be noted that the elastic force of the first elastic member 11 is relatively large, which can force the first sealing plate 9 to overcome the elastic force of the first torsion spring and force the second sealing plate 13 to overcome the elastic force of the second torsion spring through the slide rod 14). The advantage of such a setting is that in this embodiment, when two adjacent water tanks 3 are not connected, the connecting pipe 6 is blocked by the first sealing plate 9, and the connecting pipe 4 is blocked by the second sealing plate 13, so that the two water tanks 3 can be pre-filled with water without leakage (or without leakage during the recycling process); when the connecting pipe 4 of one water tank 3 is inserted into the receiving pipe 6 of another water tank 3, through the corresponding slide plates 7 and slide rods 14 and other structures in the two water tanks 3, the first sealing plate 9 can be forced to open the corresponding receiving pipe 6, and at the same time, the second sealing plate 13 can be forced to open the corresponding connecting pipe 4 to connect the two water tanks 3 after the two water tanks 3 are locked to each other (the locking and opening of the connecting pipe 4 are basically realized synchronously).

[0040] In another embodiment provided by the present invention, further, a first mounting seat 15 and a second mounting seat 16 are fixed to the bottom of the water tank 3. A first roller 17 is rotatably connected to the first mounting seat 15, and a second roller 18 is rotatably connected to the second mounting seat 16. Specifically, in the above embodiment, the water tank 3 can move on the bearing platform 2 of the support frame 1. For the unfilled water tank 3, it can be directly carried and moved. However, for the water tank 3 that has been filled with water and recycled, its movement on the bearing platform 2 is not convenient enough. Therefore, two groups of mounting seats are provided at the bottom of the water tank 3. Among them, two first mounting seats 15 are symmetrically arranged and are both located on the side of the water tank 3 close to the receiving pipe 6, and two second mounting seats 16 are symmetrically arranged and are both located on the side of the water tank 3 close to the connecting pipe 4. In this way, the water tank 3 can move on the platform of the support frame 1 through the first roller 17 and the second roller 18.

[0041] When several water tanks 3 on the same bearing platform 2 are connected to each other, several mounting seats need to be braked to prevent several water tanks 3 from moving synchronously on the support frame 1. Such as Figure 8As shown, preferably, a brake rod 19 is slidably connected to the first mounting seat 15, and the brake rod 19 extends into the water tank 3. The top end of the brake rod 19 is configured with a wedge-shaped portion 191, and the bottom end is configured with a friction portion 192. A second elastic member 20 is provided in the water tank 3 for forcing the friction portion 192 to move away from the first roller 17. Specifically, the brake rod 19 passes through the first mounting seat 15 and the water tank 3 at the same time, and a dynamic sealing structure is provided between the brake rod 19 and the water tank 3. The brake rod 19 has a certain sliding stroke in the water tank 3. When the brake rod 19 is at the top of its stroke, the wedge-shaped portion 191 and the connecting pipe 4 are at the same height, that is, the wedge-shaped portion 191 is located on the moving stroke of the connecting pipe 4 on the other water tank 3. When the brake rod 19 is at the bottom of its stroke, the friction portion 192 contacts the first roller 17 to limit the rotation of the first roller 17; the second elastic member 20 can select a spring structure in the prior art, which is located in the water tank 3 and is sleeved on the brake rod 19. One end of the second elastic member 20 is fixed on the brake rod 19, and the other end is fixed on the inner wall of the water tank 3, so as to force the brake rod 19 to move into the water tank 3 through the second elastic member 20, thereby driving the friction portion 192 away from the first roller 17. The advantage of such a configuration is that when two adjacent water tanks 3 are not connected, the brake rod 19 is at the top of its stroke under the action of the second elastic member 20, and at this time the first roller 17 and the second roller 18 are used normally, which facilitates the movement of the water tank 3 on the supporting platform 2; after the position of the first water tank 3 is determined, the connecting pipe 4 of the second water tank 3 is inserted into the receiving pipe 6 of the first water tank 3 so that the connecting pipe 4 of the second water tank 3 contacts the wedge-shaped portion 191 in the first water tank 3, so as to force the brake rod 19 in the first water tank 3 to overcome the elastic force of the second elastic member 20 and approach the corresponding first roller 17, thereby braking the first roller 17 on the first water tank 3 through the friction portion 192, thereby avoiding the first water tank 3 from shifting during the subsequent plug-in process as much as possible, and avoiding the first water tank 3 from shifting during the subsequent ballasting process as much as possible.

[0042] As an alternative to the above-described second torsion spring disposed between the second plugging plate 13 and the water tank 3, preferably, a contact rod 21 is hinged on the second mounting seat 16. A first contact portion 211 and a second contact portion 212 are formed on the contact rod 21. The first contact portion 211 is located on one side of the second roller 18. The second contact portion 212 extends into the water tank 3 and is located on the side of the second plugging plate 13 away from the sliding rod 14. The second torsion spring is located between the contact rod 21 and the second mounting seat 16, and the elastic force of the second torsion spring is less than the elastic force of the first elastic member 11. Specifically, the contact rod 21 is integrally formed in a zigzag shape. One end thereof close to the second roller 18 is the first contact portion 211, and one end close to the second plugging plate 13 is the second contact portion 212. A movable groove is formed on the second mounting seat 16, and a through hole is formed on the water tank 3. The contact rod 21 is hinged on the inner wall of the movable groove and penetrates through the through hole. A sealing cloth 22 is fixed on the inner wall of the through hole. The area of the sealing cloth 22 is larger than the area of the through hole, and the central position of the sealing cloth 22 is fixed to the contact rod 21 so that the contact rod 21 can move in the through hole while maintaining the sealing performance at the through hole. In this embodiment, the second torsion spring is located between the contact rod 21 and the second mounting seat 16 (inner wall of the mounting groove) to force the contact rod 21 to rotate toward the second plugging plate 13 through the second torsion spring, and then force the second plugging plate 13 to plug the connecting pipe 4 through the second contact portion 212. At the same time, the second torsion spring can force the first contact portion 211 to be away from the second roller 18. When the sliding plate 7 is inserted into the clamping groove 8 to lock the connecting pipe 4, the sliding rod 14 passively contacts the second plugging plate 13, and the second plugging plate 13 passively contacts the contact rod 21 to force the contact rod 21 to rotate, and then contact the second roller 18 through the first contact portion 211 while opening the connecting pipe 4, thereby restricting the second roller 18. The advantage of such a setting is that after the position of the first water tank 3 is determined, when the connecting pipe 4 of the second water tank 3 is inserted into the receiving pipe 6 of the first water tank 3, the first roller 17 on the first water tank 3 and the second roller 18 on the second water tank 3 can be passively braked through structures such as the braking rod 19 and the contact rod 21. In this way, by sequentially connecting several water tanks 3, the first rollers 17 and the second rollers 18 on several water tanks 3 can be sequentially braked, and it is possible to avoid as much as possible the offset of several water tanks 3 on the loading platform 2 (as shown in Figure 8 ), conversely, when the handle 12 is pulled upward, the sliding rod 14, the second plugging plate 13 and the contact rod 21 are reset under the action of the second torsion spring, thereby releasing the restriction on the second roller 18 on the first water tank 3. Subsequently, when the connecting pipe 4 is removed from the receiving pipe 6, the restriction on the first roller 17 on the first water tank 3 can be released.

[0043] The present invention also provides a construction method for protecting a gravity support system of a close-fitting subway station, which is based on any of the above-mentioned support systems, and connects and locks two adjacent water tanks 3 through a connecting pipe 4 and a receiving and locking mechanism. When laying out the water tank ballast system, the connecting pipe 4 of one water tank 3 is inserted into the receiving and locking mechanism of another water tank 3 to connect and lock the two adjacent water tanks 3, so that when water is poured into one water tank 3, the same liquid level height is maintained in multiple interconnected water tanks 3.

[0044] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A gravity support system for protecting a subway station, comprising a support frame and a load-bearing platform arranged layer by layer, wherein a plurality of water tanks are arranged on the load-bearing platform, characterized in that: The water tank is provided with: A connecting pipe horizontally connected to the bottom of the water tank; A receiving and locking mechanism, which is used to receive the connecting pipe and lock the connecting pipe; The receiving and locking mechanism comprises a receiving pipe fixedly connected to the water tank and a slide plate slidably connected to the water tank, and a clamping groove is configured on the connecting pipe; A first blocking plate is hinged on the slide plate, and a first torsion spring is arranged between the slide plate and the first blocking plate; When the connecting pipe is not inserted into the receiving pipe, the first blocking plate is attached to the inner wall of the water tank under the action of the first torsion spring and is kept in the same plane as the sliding plate; The sum of the thickness of the slide plate and the first blocking plate is equal to the width of the clamping groove; The receiving and locking mechanism further comprises a limiting block fixed to the inner wall of the water tank and a first elastic member for forcing the slide plate to approach the limiting block; A second blocking plate is hinged in the water tank, and a second torsion spring is provided on the water tank for forcing the second blocking plate to block the connecting pipe; A sliding rod is slidably connected in the connecting tube, one end of the sliding rod is configured with a wedge-shaped surface and the wedge-shaped surface is located in the clamping groove, and the other end of the sliding rod is in contact with the second blocking plate; When two adjacent water tanks are not connected, the receiving pipe is blocked by the first blocking plate, and the connecting pipe is blocked by the second blocking plate, so that the two water tanks can be pre-filled with water without leakage; When the connecting pipe of one water tank is inserted into the receiving pipe of another water tank, the corresponding slide plates, slide rods and other structures in the two water tanks can force the first sealing plate to open the corresponding receiving pipe, and at the same time force the second sealing plate to open the corresponding connecting pipe, so as to connect the two water tanks after the two water tanks are locked with each other.

2. A gravity support system for protecting a close-fitting subway station according to claim 1, characterized in that: A handle is vertically inserted into the inner wall of the water tank, the top end of the handle is exposed out of the water tank, and the bottom end is fixed to the slide plate.

3. The gravity support system for protecting a subway station according to claim 1, characterized in that: A first mounting seat and a second mounting seat are fixed to the bottom of the water tank, a first roller is rotatably connected to the first mounting seat, and a second roller is rotatably connected to the second mounting seat; A brake rod is slidably connected to the first mounting seat, the brake rod extends into the water tank, a wedge-shaped portion is configured at the top end of the brake rod, and a friction portion is configured at the bottom end; The brake rod has a certain sliding stroke in the water tank. When the brake rod is at the top of its stroke, the wedge-shaped portion and the connecting pipe are at the same height, that is, the wedge-shaped portion is located on the moving stroke of the connecting pipe on the other water tank. When the brake rod is at the bottom of its stroke, the friction portion contacts the first roller to limit the rotation of the first roller. A second elastic member for forcing the friction part to stay away from the first roller is arranged in the water tank.

4. A construction method for protecting a gravity support system for a subway station, based on the support system described in any one of claims 1 to 3, characterized in that: The two adjacent water tanks are locked in communication through a connecting pipe and a receiving locking mechanism.

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