Multi-sinking well assembled non-interior support strip-shaped underground space enclosure structure and construction method

Abstract

The application discloses a multi-well assembly type non-interior support strip-shaped underground space enclosure structure and a construction method. Multiple well structures are arranged along a straight line. The side walls of each well structure facing another well structure are detachable side walls, and the rest are permanent side walls. Underground continuous walls are arranged between every two permanent side walls and are connected to the corresponding underground continuous walls through open grooves. Each underground continuous wall comprises multiple prefabricated blocks arranged in a horizontal direction and multiple steel strands arranged in a vertical direction. Electromagnetic force adsorption devices are arranged on both sides of each open groove. When sinking into the well structure, an external steel plate is adsorbed by the electromagnetic force adsorption devices at the side openings of the corresponding open grooves to form a vertical enclosed space. The other end of each steel strand extends upward from the corresponding enclosed space and remains on the ground. The application can realize a non-interior support enclosure structure form, improve the construction efficiency, and facilitate the assembly implementation of the internal structure in the later stage.

Description

Technical Field

[0001] This invention relates to the field of caisson construction technology, and in particular to a multi-caisson prefabricated strip underground space enclosure structure without internal support and its construction method. Background Technology

[0002] In areas with soft soil and abundant water, long, narrow underground spaces (such as underground rail transit stations and open-cut sections of underground vehicular tunnels) are typically constructed using the open-cut method, with their retaining structures mainly consisting of diaphragm walls and internal support systems. Current prefabricated retaining structure technologies utilize precast diaphragm walls and steel supports, prefabricated steel composite supports, etc., for the internal support systems.

[0003] Therefore, when constructing prefabricated structures for underground spaces, the influence of the internal support system must be considered. This necessitates that the longitudinal length of the prefabricated components of the internal structure be less than the longitudinal spacing of the internal supports, typically only 2 meters. This results in a large number of modular sections and joints in the prefabricated internal structure of underground spaces, thereby reducing construction efficiency, increasing the risk of joint quality control, and raising construction costs.

[0004] Therefore, how to achieve an enclosure structure without internal support, improve construction efficiency, and facilitate the prefabricated implementation of the internal structure in the later stage has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of the above-mentioned deficiencies of the prior art, the present invention provides a multi-caisson prefabricated strip underground space retaining structure without internal support and a construction method thereof. The purpose is to achieve a retaining structure without internal support, improve construction efficiency, and facilitate the prefabricated implementation of the internal structure in the later stage.

[0006] To achieve the above objectives, the present invention discloses a multi-caisson prefabricated strip underground space enclosure structure without internal support, comprising multiple caisson structures, wherein the multiple rectangular caisson structures are arranged along a straight line on a horizontal plane.

[0007] In this embodiment, the sidewall of each caisson structure facing the adjacent caisson structure is a detachable sidewall, and the remaining sidewalls are permanent sidewalls.

[0008] A diaphragm wall is provided between the two permanent sidewalls on the same side of every two adjacent caisson structures;

[0009] Each of the caisson structures is provided with an opening groove at the location where it connects to the corresponding diaphragm wall, which matches the thickness of the corresponding diaphragm wall. The caisson structure is then interlocked with the corresponding diaphragm wall through the opening groove.

[0010] Each of the aforementioned opening slots is open at the top and closed at the bottom;

[0011] Each of the aforementioned diaphragm walls comprises multiple prefabricated blocks of the same width arranged in a horizontal direction;

[0012] Each of the precast blocks of the diaphragm wall is provided with multiple steel strands in the vertical direction;

[0013] Each of the multiple steel strands of the underground continuous wall is anchored by anchors to the opening slot position of the caisson structure that is closer to the middle position of the multiple caisson structures in two adjacent caisson structures.

[0014] Each of the opening slots is provided with an electromagnetic adsorption device on both sides;

[0015] When sinking into each of the aforementioned caisson structures, an external steel plate is adsorbed at the side opening of the corresponding opening slot by the electromagnetic force adsorption device, thereby enclosing the corresponding opening slot into a vertical enclosed space with an opening at the top.

[0016] One end of each of the steel strands is set with the corresponding anchor in the corresponding caisson structure, and the other end extends upward from the corresponding enclosed space and remains on the ground.

[0017] Preferably, a water-stop rubber is provided between each of the underground continuous walls and the corresponding opening groove.

[0018] Preferably, each of the detachable sidewalls is a steel structure and is connected to the two adjacent permanent sidewalls by bolts or the electromagnetic adsorption device.

[0019] Preferably, each pair of adjacent precast blocks is provided with matching grooves and tenons, so that each of the multiple precast blocks of the underground continuous wall includes a grooved precast block with one side engaged with the corresponding opening groove and the other side provided with the groove, a tenoned precast block with one side engaged with the corresponding opening groove and the other side provided with the tenon, and multiple intermediate precast blocks with grooves and tenons on both sides respectively.

[0020] Preferably, in the plurality of caisson structures, the space between each of the openings in the two caisson structures located at both ends and the corresponding underground continuous wall is filled with polyurethane to form a waterproof structure.

[0021] This invention also provides a construction method for a multi-caisson prefabricated strip underground space enclosure structure without internal support, comprising the following steps:

[0022] Step 1: Precast all the precast blocks of all the caisson structures and all the underground continuous walls;

[0023] Step 2: Install all the corresponding steel strands in all the opening slots, and install them together with the corresponding anchors in the corresponding caisson structure;

[0024] Step 3: Using the electromagnetic force adsorption device, an outer steel plate is adsorbed at the side opening of all the opening slots to form the vertical enclosed space. At the same time, the corresponding ends of all the steel strands left on the ground are pulled out from the upper opening of the vertical enclosed space.

[0025] Step 4: Sink all the aforementioned caisson structures to the required depth;

[0026] Step 5: Turn off all the electromagnetic attraction devices and remove all the external steel plates;

[0027] Step 6: Use a diaphragm wall trenching machine to perform trenching construction between each pair of openings where the diaphragm wall needs to be installed;

[0028] Step 7: Assemble all the prefabricated blocks of each diaphragm wall on the ground and thread the corresponding steel strands through them, and fix the last prefabricated block in the plurality of prefabricated blocks of the corresponding diaphragm wall to be threaded through.

[0029] Step 8: Install each of the underground continuous walls along the two corresponding openings between the two corresponding permanent sidewalls;

[0030] Step 9: After tensioning the corresponding steel strands in all the caisson structures equipped with the anchors until all the precast blocks of each underground continuous wall are tightly fitted, anchor them using the corresponding anchors.

[0031] Preferably, after completing step 9, polyurethane is filled between each of the openings in the two caisson structures located at both ends and the corresponding underground continuous wall to form a waterproof structure.

[0032] Preferably, after completing step 9, after excavating the earthwork within each space enclosed by the underground continuous wall and the detachable sidewall to the designed depth, backfilling the filling concrete, rebuilding the internal structure, and dismantling the corresponding detachable sidewall in sequence.

[0033] The beneficial effects of this invention are:

[0034] This invention enables an enclosure structure without internal support, improving construction efficiency and facilitating the prefabricated implementation of the internal structure. It allows for the enclosure of long, narrow underground spaces without internal support, further improving construction efficiency, altering the stress pattern of the diaphragm wall, and reducing the insertion depth and maximum internal force. The external steel plate can be pulled out and recycled.

[0035] The following will further explain the concept, specific structure, and technical effects of the present invention in conjunction with the accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention. Attached Figure Description

[0036] Figure 1 The diagram shows a planar structural schematic of three caisson structures in one embodiment of the present invention.

[0037] Figure 2 This diagram illustrates a planar structure for the construction of a continuous underground wall between three caisson structures in one embodiment of the present invention.

[0038] Figure 3 This invention is shown Figure 1 Schematic diagram of the cross-sectional structure along the BB direction.

[0039] Figure 4 This invention is shown Figure 2 A schematic diagram of the structure after the internal structure of the CC direction has been rebuilt.

[0040] Figure 5 This invention is shown Figure 2 Schematic diagram of the AA-direction underground diaphragm wall section.

[0041] Figure 6 This diagram illustrates the structure of multiple prefabricated blocks connected by a tenon-and-groove structure in one embodiment of the present invention.

[0042] Figure 7 This diagram illustrates the state of precast blocks of a diaphragm wall with steel strands threaded through them, according to an embodiment of the present invention. Detailed Implementation

[0043] Example: Figures 1 to 5 As shown, the multi-caisson prefabricated strip underground space enclosure structure without internal support includes multiple caisson structures, which are rectangular and arranged in a straight line on the horizontal plane.

[0044] Among them, the sidewall of each caisson structure facing the adjacent caisson structure is a detachable sidewall 1, and the remaining sidewalls are permanent sidewalls 2.

[0045] A diaphragm wall 3 is provided between the two permanent sidewalls 2 on the same side of each two adjacent caisson structures;

[0046] Each caisson structure is provided with an opening groove 4 at the location where it connects to the corresponding underground diaphragm wall 3, which matches the thickness of the corresponding underground diaphragm wall 3. The opening groove 4 is used to snap the caisson structure into the corresponding underground diaphragm wall 3.

[0047] Each slot 4 is open at the top and closed at the bottom;

[0048] Each diaphragm wall 3 consists of multiple precast blocks of the same width arranged horizontally;

[0049] Multiple steel strands 5 are installed vertically within the multiple precast blocks of each diaphragm wall 3;

[0050] Each underground continuous wall 3 has multiple steel strands 5 anchored by anchors 6 to the opening slot 4 of the caisson structure that is closer to the middle of the multiple caisson structures in two adjacent caisson structures.

[0051] Each slot 4 has an electromagnetic adsorption device 7 on both sides.

[0052] When sinking into each caisson structure, an external steel plate 8 is adsorbed at the side opening of the corresponding opening slot 4 by the electromagnetic force adsorption device 7, so that the corresponding opening slot 4 is enclosed into a vertical enclosed space with an opening at the top.

[0053] One end of each steel strand 5 is set with the corresponding anchor 6 inside the corresponding caisson structure, and the other end extends upward from the corresponding enclosed space and remains on the ground.

[0054] This invention employs a method of constructing a strip-shaped underground space enclosure structure without internal support by setting up underground continuous walls 3 between multiple caisson structures. Compared with the prior art, the cantilever force mode of the underground continuous wall 3 is changed to a simply supported force mode, which reduces the insertion depth and maximum internal force of the underground continuous wall 3 and optimizes the thickness of the underground continuous wall 3.

[0055] This invention uses several caisson structures to first form several independent underground spaces with high rigidity, and uses these as the load-bearing fulcrums of the underground continuous wall 3, thereby realizing an enclosure structure without internal support, improving construction efficiency, and especially facilitating the prefabricated implementation of the internal structure in the later stage.

[0056] In some embodiments, a water-stop rubber is provided between each diaphragm wall 3 and the corresponding opening groove 4.

[0057] In some embodiments, each detachable sidewall 1 is a steel structure and is connected to the two adjacent permanent sidewalls 2 by bolts or electromagnetic adsorption devices 7.

[0058] like Figure 6 As shown, in some embodiments, there are matching grooves and tenons between every two adjacent precast blocks, so that each underground continuous wall 3 includes a grooved precast block 31 with one side engaged with the corresponding opening groove 4 and the other side having a groove, a tenoned precast block 32 with one side engaged with the corresponding opening groove 4 and the other side having a tenon, and multiple intermediate precast blocks 33 with grooves and tenons on both sides respectively.

[0059] In some embodiments, in multiple caisson structures, each opening 4 of the two caisson structures located at both ends is filled with polyurethane 9 to form a waterproof structure between it and the corresponding underground continuous wall 3.

[0060] like Figures 1 to 5 and Figure 7 As shown, the present invention also provides a construction method for a multi-caisson prefabricated strip underground space enclosure structure without internal support, characterized by comprising the following steps:

[0061] Step 1: Precast all precast blocks for all caisson structures and all diaphragm walls 3;

[0062] Step 2: Install all the corresponding steel strands 5 in all the open slots 4, and set them together with the corresponding anchors 6 in the corresponding caisson structure;

[0063] Step 3: Using the electromagnetic force adsorption device 7, an external steel plate 8 is adsorbed at the side opening of all the opening slots 4 to form a vertical enclosed space for all the opening slots 4. At the same time, the ends of all the corresponding steel strands 5 left on the ground are pulled out from the upper opening of the vertical enclosed space.

[0064] Step 4: Sink all caisson structures to the required depth;

[0065] Step 5: Turn off all electromagnetic attraction devices 7 and remove all external steel plates 8;

[0066] Step 6: Use a diaphragm wall 3 trenching machine to perform trenching construction between each pair of open trenches 4 where diaphragm walls 3 need to be installed;

[0067] Step 7: Assemble all the precast blocks of each diaphragm wall 3 on the ground and thread the corresponding steel strands 5 through them. Fix the end of each steel strand 5 that is left on the ground to the last precast block in the corresponding diaphragm wall 3.

[0068] Step 8: Install each diaphragm wall 3 between the corresponding two openings 4 and the corresponding two permanent sidewalls 2;

[0069] Step 9: After tensioning the corresponding steel strands 5 in all caisson structures equipped with anchors 6 until all precast blocks of each underground continuous wall 3 are tightly fitted, anchor them with the corresponding anchors 6.

[0070] In some embodiments, after step 9 is completed, polyurethane 9 is filled between each opening 4 of the two caisson structures located at both ends and the corresponding underground continuous wall 3 to form a waterproof structure.

[0071] In some embodiments, after completing step 9, the earthwork within each space enclosed by the underground continuous wall 3 and the removable sidewall 1 is excavated to the designed depth, and then the filling concrete 10 is backfilled upwards, the internal structure 11 is rebuilt, and the corresponding removable sidewall 1 is removed.

[0072] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A construction method for a multi-caisson prefabricated strip underground space retaining structure without internal support, comprising multiple caisson structures; characterized in that, Multiple rectangular caisson structures are arranged along a straight line on a horizontal plane; Each of the caisson structures has a removable sidewall facing the adjacent caisson structure (1), and the remaining sidewalls are permanent sidewalls (2). A diaphragm wall (3) is provided between the two permanent sidewalls (2) on the same side of each two adjacent caisson structures. Each of the caisson structures is provided with an opening groove (4) at the location where it connects to the corresponding underground continuous wall (3), which is matched with the thickness of the corresponding underground continuous wall (3). The opening groove (4) is used to snap the caisson structure into the corresponding underground continuous wall (3). Each of the aforementioned opening slots (4) is open at the top and closed at the bottom; Each of the aforementioned diaphragm walls (3) comprises multiple prefabricated blocks of the same width arranged in a horizontal direction; Multiple steel strands (5) are arranged vertically within the precast blocks of each of the underground continuous wall (3). Each of the multiple steel strands (5) of the underground continuous wall (3) is anchored by anchors (6) to the opening slot (4) of the caisson structure that is closer to the middle position of the multiple caisson structures in two adjacent caisson structures. Each of the opening slots (4) is provided with an electromagnetic force adsorption device (7) on both sides. When sinking into each of the aforementioned caisson structures, an external steel plate (8) is adsorbed at the side opening of the corresponding opening slot (4) by the electromagnetic force adsorption device (7), thereby enclosing the corresponding opening slot (4) into a vertical enclosed space with an opening at the top. One end of each of the steel strands (5) is set with the corresponding anchor (6) inside the corresponding caisson structure, and the other end extends upward from the corresponding enclosed space and remains on the ground. The construction steps are as follows: Step 1: Precast all the precast blocks of all the caisson structures and all the underground continuous walls (3); Step 2: Set all the corresponding steel strands (5) in all the opening slots (4), and set them together with the corresponding anchors (6) in the corresponding caisson structure; Step 3: Using the electromagnetic force adsorption device (7), an external steel plate (8) is adsorbed at the side opening of all the opening slots (4) to form the vertical enclosed space of all the opening slots (4), and at the same time, the ends of all the corresponding steel strands (5) left on the ground are pulled out from the upper opening of the vertical enclosed space. Step 4: Sink all the aforementioned caisson structures to the required depth; Step 5: Turn off all the electromagnetic force adsorption devices (7) and pull out all the external steel plates (8). Step 6: Use a diaphragm wall (3) trenching machine to perform trenching construction between each pair of openings (4) where the diaphragm wall (3) needs to be installed; Step 7: Assemble all the precast blocks of each underground continuous wall (3) on the ground and thread the corresponding steel strands (5), and fix one end of each steel strand (5) left on the ground to the last precast block in the plurality of precast blocks of the corresponding underground continuous wall (3). Step 8: Each of the underground continuous walls (3) is set between the corresponding two openings (4) and the corresponding two permanent sidewalls (2); Step 9: After all the caisson structures equipped with the anchors (6) have their corresponding steel strands (5) tensioned to fit tightly against all the precast blocks of each underground continuous wall (3), they are anchored by the corresponding anchors (6).

2. The construction method of the multi-caisson prefabricated unsupported strip underground space enclosure structure according to claim 1, characterized in that, Each of the underground continuous wall (3) is provided with a water-stop rubber between it and the corresponding opening groove (4).

3. The construction method of the multi-caisson prefabricated unsupported strip underground space enclosure structure according to claim 1, characterized in that, Each of the removable sidewalls (1) is a steel structure and is connected to the two adjacent permanent sidewalls (2) by bolts or the electromagnetic force adsorption device (7).

4. The construction method of the multi-caisson prefabricated unsupported strip underground space enclosure structure according to claim 1, characterized in that, Each pair of adjacent precast blocks is provided with matching grooves and tenons, so that each of the precast blocks of the underground continuous wall (3) includes a grooved precast block (31) with one side engaged with the corresponding opening groove (4) and the other side provided with the groove, a tenoned precast block (32) with one side engaged with the corresponding opening groove (4) and the other side provided with the tenon, and multiple intermediate precast blocks (33) with grooves and tenons on both sides respectively.

5. The construction method of the multi-caisson prefabricated unsupported strip underground space enclosure structure according to claim 1, characterized in that, In the plurality of said caisson structures, each of the opening slots (4) of the two caisson structures located at both ends is filled with polyurethane (9) to form a waterproof structure with the corresponding underground continuous wall (3).

6. The construction method of the multi-caisson prefabricated unsupported strip underground space enclosure structure according to claim 1, characterized in that, After completing step 9, polyurethane (9) is filled between each of the openings (4) of the two caisson structures located at both ends and the corresponding underground continuous wall (3) to form a waterproof structure.

7. The construction method of the multi-caisson prefabricated unsupported strip underground space enclosure structure according to claim 1, characterized in that, After completing step 9, excavate the earthwork within each space enclosed by the underground continuous wall (3) and the detachable sidewall (1) to the design depth, and then backfill with filling concrete (10), rebuild the internal structure (11), and remove the corresponding detachable sidewall (1) in sequence.

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